The work brings together progress from multiple research groups and is authored by scientists affiliated with Kyung Hee University in South Korea and collaborators in the broader energy materials community. Their review, published in a scientific journal focused on advanced materials, maps out where the field is now and where it needs to go next.

What Are Supercapacitors, and Why Should You Care?

Supercapacitors are energy storage devices that sit between regular batteries and traditional capacitors:

• Compared with batteries:
  They store less energy than most lithium-ion batteries but can be charged and discharged much faster and can survive hundreds of thousands of cycles with little performance loss.
• Compared with standard capacitors:
  They store far more energy, making them practical for real-world uses like backup power, electric vehicles, and wearable electronics.

In simple terms:

• Batteries are like a water tank that fills slowly but holds a lot.
• Supercapacitors are like a smaller tank that can be filled and emptied almost instantly.

This speed, durability, and reliability make supercapacitors attractive for:

• Electric and hybrid vehicles (quick acceleration and energy recovery from braking)
• Backup power for electronics
• Wearable and flexible gadgets
• Internet-of-Things (IoT) sensors that need tiny but frequent energy bursts

The big challenge has been energy density—how much energy they can store. The new research focuses on fixing that without losing speed or lifetime.

Who Did the Research?

The article is a comprehensive review rather than a single lab experiment. It pulls together findings from many studies worldwide. The lead authors are researchers in materials science and electrochemistry, with key contributions from Kyung Hee University, South Korea, a university known for its work in advanced energy materials.

Their goal is to give both scientists and industry a clear picture of:

• Which electrode materials work best
• How to design them more cleverly
• How to scale them up in a cost-effective and eco-friendly way

How Do Supercapacitors Store Energy?

The review highlights two main ways supercapacitors store energy, explained simply:

1. Electric Double-Layer Capacitance (EDLC)
   • Ions from the liquid inside the device (the electrolyte) stick to the surface of the electrode, like dust clinging to a balloon.
   • No chemical reaction, just electrostatic attraction.
   • This is fast, very repeatable, and gives long life.
2. Pseudocapacitance
   • Here, fast chemical reactions happen at or very near the surface of the electrode.
   • These reactions involve electrons moving in and out of the material, allowing it to store more charge than EDLC alone.
   • This can increase energy storage but must be controlled so the material doesn’t degrade quickly.

Most of the new electrode designs try to combine both:

• Lots of surface area for EDLC
• Carefully designed chemistry for pseudocapacitance

The Four Big Families of Next-Gen Electrode Materials

The review organizes the recent progress into four major material classes.

1. Carbon-Based Materials: The Workhorses

Carbon is the backbone of most commercial supercapacitors because it’s:

• Cheap
• Conductive (moves electrons easily)
• Stable (lasts many cycles)

The paper covers several advanced forms:

• Activated carbon
  Very porous, like a sponge full of tiny holes. Widely used already but researchers are tuning the size and connectivity of pores to store more charge and allow ions to move faster.
• Biomass-derived carbons
  Made from waste like coconut shells, wood, agricultural residues, or even food waste.
  These offer:
  • Low cost
  • Lower environmental impact
  • Naturally interesting structures that can be converted into hierarchically porous carbons (with pores of different sizes for better ion transport).
• Graphene and carbon nanotubes (CNTs)
  • Graphene is a one-atom-thick sheet of carbon; CNTs are tiny rolled-up tubes.
  • Both are incredibly conductive and have high surface area.
  • Combining them with activated or biomass carbons can form 3D networks that improve both charge storage and mechanical strength.
• Heteroatom-doped carbons
  By adding other elements—like nitrogen, sulfur, or phosphorus—into the carbon structure, researchers can:
  • Increase how easily electrons move
  • Add more spots on the surface where ions can cling or react
    This boosts both capacitance and energy density.

2. Metal Oxides and Hydroxides: Powering Pseudocapacitance

While carbon is great for speed and stability, metal oxides and hydroxides can store more charge through fast chemical reactions at the surface.

Key materials include:

• Nickel oxide/hydroxide
• Cobalt oxide/hydroxide
• Manganese oxide

These materials can offer much higher theoretical capacitance, but they can be:

• Less conductive
• Prone to volume changes during cycling
• Less stable if used alone

To fix this, researchers are:

• Designing nanostructures (nanowires, nanosheets, hollow spheres) so ions and electrons don’t have far to travel.
• Pairing them with conductive carbons (graphene, CNTs, porous carbons) to form hybrid electrodes that:
  • Maintain high capacitance
  • Improve electrical conductivity
  • Enhance cycle life

3. MOF-Derived Materials: Designer Porous Carbons

Metal–Organic Frameworks (MOFs) are crystal-like structures made from metal atoms and organic linkers. They have:

• Extremely high internal surface area
• Highly tunable structures

On their own, MOFs are usually not stable or conductive enough as electrodes. But when heated in a controlled way, they can turn into:

• Porous carbons
• Metal–oxide/carbon composites

The review shows that MOF-derived materials can offer:

• Tailored pore structure (ideal for ion movement)
• Uniform distribution of active sites
• Easy doping (adding elements like nitrogen) to improve performance
• Opportunities to form hybrids with other active materials

This makes them promising for supercapacitors with both high energy and high power.

4. MXenes: The Rising Stars

MXenes are a newer family of 2D materials made of transition metal carbides or nitrides.

Their key advantages:

• Very high electrical conductivity
• Layered structure that can be opened up to allow ions in
• Active surfaces that can participate in fast, reversible reactions

The review notes that MXene-based electrodes can:

• Store lots of charge in a thin, compact form
• Work well in flexible and even wearable devices
• Be combined with polymers, carbon materials, or metal oxides to form multifunctional hybrids

Researchers are also tackling issues like:

• Preventing layers from sticking too tightly together (which would block ions)
• Improving long-term chemical stability

Main Findings: What Has Actually Improved?

Based on the many studies discussed, the authors highlight several key achievements:

• Much higher capacitance:
  Carefully designed carbon, metal oxide, MOF-derived, and MXene-based materials routinely reach several hundred F/g (a common unit for storage capacity), with some hybrids exceeding this.
• Better energy density:
  By combining EDLC and pseudocapacitance in smart ways, some supercapacitors are approaching energy densities of tens of Wh/kg, narrowing the gap with batteries while keeping supercapacitor speed and life benefits.
• Outstanding cycle life:
  Many advanced electrodes maintain over 90–100% of their capacity even after tens of thousands of charge–discharge cycles.
• Fast charging and high power:
  Hierarchically porous structures and conductive networks help devices deliver and absorb power at very high rates, ideal for rapid charging and sudden power demands.
• Flexibility and form factor:
  MXenes, graphene, and polymer-based composites enable flexible, bendable, and even stretchable supercapacitors, suitable for wearables and soft electronics.
• Greener, cheaper routes:
  Biomass-derived carbons and low-temperature, solution-based methods are pushing the field toward more sustainable and scalable production.

Why This Matters

The authors stress that these advances are not just academic. They could help to:

• Support renewable energy
  Supercapacitors can smooth out short-term fluctuations from solar and wind, improving grid stability.
• Improve electric vehicles
  Pairing batteries with supercapacitors can:
  • Extend battery life
  • Improve braking energy recovery
  • Enable faster bursts of power
• Power the Internet of Things (IoT)
  Tiny, long-lasting, fast-charging storage units are perfect for networks of sensors in smart homes, smart cities, and industrial monitoring.
• Enable wearable and flexible tech
  Lightweight, bendable supercapacitors could be integrated into clothing, medical patches, and flexible screens.
• Reduce environmental impact
  Using biomass, MOFs, and scalable, low-toxicity processes can cut the carbon footprint and cost of energy storage devices.

The Remaining Challenges

Even with the impressive progress, the review is clear that important obstacles remain:

• Scalability:
  Lab-scale methods, especially for MXenes and some MOF-derived materials, must be adapted for mass production without losing performance.
• Cost:
  Some precursors and synthesis techniques are still relatively expensive.
• Stability and safety:
  Ensuring long-term stability in real-world conditions (temperature changes, mechanical stress, many years of cycling) remains critical.
• Standardization:
  The field needs consistent testing methods to fairly compare results from different labs and materials.

The authors argue that the future lies in hybrid, multifunctional systems that combine the best of all worlds: cheap carbons, high-capacitance metal oxides, tunable MOF-derived structures, and ultra-conductive MXenes—developed using sustainable, scalable processes.

In Summary

• The reviewed research shows major advances in the design of supercapacitor electrodes, especially in carbon materials, metal oxides, MOF-derived carbons, and MXenes.
• Carefully engineered structures and smart combinations of materials are pushing supercapacitors toward higher energy density, faster charging, longer life, and better sustainability.
• These developments could have a big impact on renewable energy, electric vehicles, IoT, and wearable technology, provided that cost and scalability challenges are solved.

Bridging EDLC and pseudocapacitive mechanisms through materials design: recent advances in supercapacitor electrodes

•  Energy Storage Context: Efficient energy storage is crucial for renewable energy, electrification, and digital technologies. Batteries offer high energy but limited power, while capacitors offer fast charge/discharge but low energy. Supercapacitors bridge this gap with high power, long cycle life, and rapid charging.
•  Charge Storage Mechanisms: Three main types:
•  Market Trends: Supercapacitor market projected to grow from ~$4.2B (2022) to >$9B (2027) at >14% CAGR, led by Asia-Pacific; MXenes, hierarchical carbons, and redox-active polymers are research priorities.
• Niraj Kumar ^ab, Seul-Yi Lee ^ab, Soo-Jin Park

See Paper

•  Research Focus: Study of host–guest interactions in low-symmetry M₈Lun4 molecular barrel (UNMB) and its fullerene-encapsulated analogues (C₆₀⊂UNMB, C₇₀⊂UNMB) to understand structure–property relationships for molecular electronics and thermoelectrics.
•  Conductance Findings: Guest encapsulation increased current density by ≈1.5 orders of magnitude, highlighting strong modulation of UNMB’s electronic structure.
•  Thermopower Results: Encapsulation reduced Seebeck coefficient from +174.4 µV K⁻¹ (UNMB) to +85.3 µV K⁻¹ (C₆₀⊂UNMB) and +90.9 µV K⁻¹ (C₇₀⊂UNMB), indicating HOMO-dominated hole transport.
•  Characterization: Molecular assemblies analyzed via ¹H-NMR, ¹³C-NMR, ESI-MS, AFM, XPS, and UPS to confirm structure, monolayer formation, and electronic energy levels.
•  Molecular Assembly: UNMB provides a hydrophobic cavity to encapsulate fullerenes while minimizing their diffusion; monolayers on gold surface formed via spin-coating.
•  Measurement Technique: Charge transport measured using EGaIn-based molecular junctions; thermopower measured with a modified setup creating a controlled temperature gradient.
•  Charge Transport Mechanism: Temperature-dependent I–V measurements show thermally activated hopping; activation energies increased upon encapsulation (UNMB: 337 meV, C₆₀⊂UNMB: 448 meV, C₇₀⊂UNMB: 557 meV).
•  Theoretical Insight: HOMO energy offsets from UPS explain observed conductance and thermopower trends; EF–EHOMO inversely correlates with conductance, supporting hopping mechanism.
•  Significance: Demonstrates modulation of thermoelectric properties via noncovalent fullerene encapsulation without altering molecular backbone; lays groundwork for supramolecular thermoelectrics and adaptive energy harvesting devices.
•  Acknowledgements: Funding support from IISc, DST-INSPIRE, SERB-Core, UGC, PMRF; no conflicts of interest reported.

A study from the Indian Institute of Science (IISc) in Bangalore has unveiled the extraordinary potential of nature-inspired “host–guest” chemistry to design next-generation molecular electronic devices. By exploring how molecules interact at the smallest scale, the team demonstrated a clever way to control electricity flow and even generate energy using supramolecular “barrels” and fullerenes (soccer-ball-shaped molecules). Their findings could lead to advances in miniature electronics and sustainable energy technologies.

The research, led by Dr. Partha Sarathi Mukherjee and Dr. Veerabhadrarao Kaliginedi, along with their team, was published in Angewandte Chemie International Edition. It investigates how encapsulating fullerenes (C₆₀ and C₇₀) inside custom-designed molecular cages dramatically changes the electrical and thermoelectric properties of the system. This breakthrough helps us better understand and manipulate the invisible but critical forces at play in molecular electronics.

What Did They Discover?

The study explored host–guest interactions—a bit like puzzle pieces fitting together. The “host” in this case is a low-symmetry molecular barrel designed to trap specific “guest” molecules, such as fullerenes. The researchers found two key things:

1. Enhanced Conductance: Encapsulating fullerenes in the molecular barrel led to a 1.5-order-of-magnitude increase in current flow, meaning electricity passed through more efficiently.
2. Tunable Thermoelectric Properties: While conductance increased, the thermopower (a property that converts heat into electrical energy) decreased, suggesting a fine balance between the two. Notably, the system favored HOMO-mediated charge transport—essentially relying on electrons moving from high-energy areas in the molecule.

This unique interplay of these properties highlights how molecular behavior can be precisely tuned for specific applications.

Why Does It Matter?

This research opens the door to designing futuristic materials for electronics and energy. Host–guest systems are modular, reversible, and don’t need chemical bonds to work, giving them an edge in adaptability. Possible benefits include:

• Smaller, Smarter Electronics: Molecular-scale designs like this could pave the way for ultra-compact and efficient devices.
• Energy Harvesting Technologies: Tunable thermopower could be used to convert waste heat into electricity in a sustainable and low-cost way—a key element in the push for renewable energy solutions.
• New Possibilities for Sensors: Host–guest interactions allow for responsive designs that change their properties based on the environment, ideal for smart sensors.

Who’s Behind the Breakthrough?

The study was conducted by a team of researchers at the Indian Institute of Science (IISc), Bangalore, including Sunil Kumar, Dharmraj Prajapati, Pooja Singh, Shamsad Ali, Arpita Panda, with senior researchers Dr. Partha Sarathi Mukherjee and Dr. Veerabhadrarao Kaliginedi leading the effort. Funding support was provided by the Indian government through programs such as DST-INSPIRE and SERB.

Simplifying the Big Picture

Think of these molecular barrels as tiny safe houses for specific molecules like fullerenes. By trapping fullerenes, the barrel’s electrical behavior changes dramatically. This is a big deal because it means we can control electricity and heat flow at the molecular level—a critical skill for designing smaller, more efficient technology.

What’s Next?

The team’s findings highlight a new path in molecular electronics and thermoelectrics. Future research could dig deeper into making these systems even more efficient while exploring real-world devices that leverage the ability to tune molecular interactions.

Stay tuned—your next phone or laptop may be powered by the science of molecular puzzles.

Probing Host–Guest Interactions via Conductance and Thermopower Measurements

• Sunil Kumar, Dharmraj Prajapati, Pooja Singh, Shamsad Ali, Arpita Panda, Partha Sarathi Mukherjee, Veerabhadrarao Kaligined
• Increased Conductance: 1.5-order magnitude rise in current density.
• Host-Guest Interactions: Encapsulation of fullerenes enhances properties.
• Thermopower Measurement: Decreased thermopower with guest molecules.
• HOMO-Mediated Transport: Charge transport dominated by highest occupied orbitals.
• Future Applications: Insights for molecular electronics and energy harvesting.

Read Full Article

•  Supercapacitor Importance: Supercapacitors offer high-power density and rapid charge-discharge capabilities, enabling quick energy bursts for EVs, industrial machinery, UPS systems, and renewable energy stabilization.
•  Material Innovation: Research focuses on advanced materials (hierarchical porous carbons, graphene, conductive polymers, phosphorene) with high surface area, conductivity, and capacitance for enhanced supercapacitor performance.
•  Phosphorene Overview: A 2D black phosphorus variant with puckered structure, tunable bandgap, high theoretical capacitance, and excellent conductivity, making it promising for next-generation energy storage.
•  Electronic & Structural Properties: Phosphorene exhibits semiconducting behavior, anisotropic ion diffusion, and high carrier mobility (285–1000 cm²/Vs), with layer-dependent tunable bandgaps (0.3–2.0 eV) suitable for FETs and photovoltaics.
•  Mechanical Properties: Anisotropic Young’s modulus and high tensile strain tolerance (zigzag 27%, armchair 30%) make phosphorene flexible, ductile, and ideal for nanoelectromechanical systems and supercapacitor electrodes.
•  Surface & Porosity: High surface-to-volume ratio, controlled pore distribution, and increased hydrophobicity enhance ion diffusion, electrical conductivity, and overall electrode performance in supercapacitors.
•  Stability Challenges: Phosphorene degrades rapidly in air due to oxidation and moisture, especially for thin layers, limiting long-term electrochemical stability and commercial viability.
•  Development Timeline: Since 2014, phosphorene has progressed from isolation to industrial-scale applications in flexible electronics, sensing, energy storage, and quantum devices through advanced synthesis, functionalization, and theoretical modeling.
•  Comparison with 2D Materials: Unlike graphene (zero bandgap) or TMDCs, phosphorene has a tunable bandgap, anisotropic electrical/thermal/mechanical properties, and high flexibility, offering advantages for semiconductors, optoelectronics, and supercapacitors, though environmental stability is a concern.
•  Stabilization Needs: Effective encapsulation or chemical modification strategies are required to mitigate degradation under ambient conditions to fully exploit phosphorene’s potential in supercapacitor applications.
•  Summary Tables: Tables compare phosphorus allotropes and 2D materials’ structural, electronic, mechanical, thermal, and optical properties, emphasizing phosphorene’s distinct advantages and limitations.

The Research at a Glance
The research paper titled “Recent Advances in Phosphorene: A Promising Material for Supercapacitor Applications”, authored by Niraj Kumar, Radhamanohar Aepuru, Seul-Yi Lee, and Soo-Jin Park, spotlights phosphorene as the next big thing in energy storage. Conducted across several leading institutions, the team explored the unique properties of phosphorene—an atom-thin layer derived from black phosphorus—and its potential in supercapacitors. Published in the Materials Science and Engineering: R: Reports journal, the study offers a comprehensive look at how this material can revolutionize future technologies.

Why Phosphorene Matters
Phosphorene is a two-dimensional (2D) form of black phosphorus, just one atom thick. What makes it exceptional is its combination of high electrical conductivity, mechanical strength, and flexibility. Additionally, it has an impressive ability to store electrical charge, making it an ideal candidate for use in supercapacitors—devices used for fast energy storage and release.

Unlike traditional batteries, which can take hours to charge and degrade over time, supercapacitors provide rapid energy bursts and maintain their capacity over many cycles. According to the study, phosphorene’s unique properties could address long-standing challenges in energy storage, such as improving charging speed, capacity, and device stability.

What the Researchers Discovered
The paper discusses several key findings:

1. High Carrier Mobility: Phosphorene can rapidly transport electrical charges, allowing supercapacitors to charge and discharge faster.
2. Outstanding Electrochemical Properties: Its structure and composition enable it to store large amounts of energy in a stable and efficient way.
3. Versus Other Materials: Compared to existing 2D materials like graphene, phosphorene has better performance when it comes to energy density and flexibility, making it more favorable for commercial-scale applications.
4. Sustainability and Longevity: Phosphorene retains its properties over repeated charging cycles, making it a long-lasting solution for energy storage.

The study also highlights novel strategies to stabilize phosphorene, which tends to degrade quickly when exposed to air. From surface coatings to encapsulation techniques, researchers are working on ways to improve its durability, bringing it closer to being ready for commercial use.

Why It Matters
Energy storage is one of the most critical challenges of our time. With the rise of renewable energy, electric vehicles, and portable technology, we need efficient, sustainable, and high-performance ways to store electricity. Phosphorene supercapacitors could lead to faster-charging smartphones, improved solar energy storage, and even lighter, more efficient batteries for electric cars.

Supercapacitors made from phosphorene can also be adapted for challenging environments like space exploration, where durability and efficiency are vital. As the demand for energy storage technology skyrockets, phosphorene offers a promising solution to meet global energy needs sustainably.

What’s Next?
Although the prospects for phosphorene are exciting, challenges remain. Researchers must overcome its tendency to degrade when exposed to oxygen and humidity, as well as find cost-effective ways to produce it on an industrial scale. However, with advances in stabilization techniques and scalable manufacturing, phosphorene could soon transition from the lab to everyday applications.

Stay tuned for further developments in the world of phosphorene, as researchers across the globe keep turning this supermaterial into a super solution for energy storage and beyond!

Recent advances in phosphorene: A promising material for supercapacitor applications

• Niraj Kumar, Radhamanohar Aepuru, Seul-Yi Lee, Soo-Jin Park
• Phosphorene shows high electrical conductivity.
• Superior energy density for supercapacitors.
• Stabilization techniques enhance practical applications.
• Outperforms graphene in energy storage.
• Promises faster-charging, long-lasting energy solutions.

Read Full Article

Revolutionary Memristor Mimics Brain Functions While Detecting Radiation

• Memristive devices like RRAM use metal–insulator–metal structures for efficient data storage.
• Memristors process data in-memory, eliminating the von Neumann bottleneck.
• Inspired by nervous system structure, memristors mimic neuron groups for data processing.
• Crossbar arrays enable dense memory integration but require selectors to prevent sneak currents.
• AlFeO3 enhances device performance with stable crystal structure and multiferroic properties.

The Key Findings:

1. Gamma Radiation Detection: The AlFeO3 memristor can act as a dosimeter, accurately detecting varying levels of gamma radiation. This could have significant implications for radiation safety and monitoring.
2. Data Storage: The memristor serves as a next-generation data storage device. Unlike traditional memory systems that convert analog sensory data to digital formats, this device can store information directly, leading to enhanced efficiency and reduced latency.
3. Artificial Synapse Functionality: Inspired by the human brain, the memristor mimics synaptic functions, demonstrating the ability to undergo modifications in strength and efficiency similar to neural connections, known as short-term and long-term plasticity. This is crucial for developing AI systems that function like the human brain.

Methodology:

The fabrication of this memristor involves a sandwich structure where a thin film of AlFeO3 is deposited on a conductive fluorine-doped tin oxide (FTO) substrate. The device’s top electrode can be made from various materials, such as silver or gold, influencing its switching behavior. Two key processes are critical:

• Electrode Engineering and Nanocrystal Integration: By embedding metal nanocrystals (such as silver and gold) within the AlFeO3 layer, the researchers were able to manipulate the formation and behavior of conductive filaments crucial for resistive switching.
• Temperature-Controlled Deposition: Adjusting the deposition temperature of the AlFeO3 layer provided a means to switch between memory and threshold functionalities within the same device.

Significance:

This research not only pushes the envelope in multiple technological domains but also bridges the gap between biological processes and electronic devices. Here are some of the potential applications:

• Neuromorphic Computing: The integration of synaptic functionalities allows the memristor to become a building block for neuromorphic systems, promising more efficient and powerful computing architectures that mimic the human brain.
• Radiation Safety and Monitoring: As a gamma radiation detector, this device can be employed in environments where radiation exposure is a concern, ensuring timely and accurate monitoring.
• Enhanced Data Storage: By storing data in a resistive state, the memristor offers a more compact, efficient, and durable memory solution compared to conventional digital storage methods.

Transformative Technology:

The AlFeO3 memristor is not just another advancement in technology; it represents a paradigm shift. Combining sensors, memory, and computing into a single, multifunctional device is an exceptional leap toward creating more intelligent, efficient, and adaptable technological systems. The interdisciplinary approach—melding physics, chemistry, and electrical engineering—withstood numerous rigorous cycles of testing, showcasing its durability and reliability even under high thermal stress.

Scientists have made a significant advancement in memory technology. They created devices that can combine sensing, storage, and computing functions into one unit. This innovation has the potential to revolutionize data processing and storage, leading to more efficient and compact electronic devices.

Researchers developed to enhance resistive random access memory (RRAM) by utilizing materials such as AlFeO3. This aluminum iron oxide enables resistive switching for data storage and also shows sensitivity to gamma radiation, making it suitable for dosimetry applications. By integrating memristors into the memory computing architecture, data processing can be done at the sensor level, eliminating the need for separate data conversion and transmission steps. This advancement improves power efficiency and reduces latency, which is crucial for real-time data processing. The use of metal nanocrystals in the AlFeO3 thin films further improves device performance by concentrating electric fields, leading to enhanced stability and operational speed. These developments are a significant step towards reliable and high-performance memory devices that can withstand various environmental conditions, including high thermal stress.

Ongoing research aims to refine these multifunctional devices, promising further advancements in memory technology. These breakthroughs will redefine electronic devices in various industries, providing enhanced radiation sensing capabilities, improved thermal stability, and greater power efficiency. By harnessing the full potential of materials like AlFeO3 and integrating advanced computing architectures, researchers are on the verge of unlocking new possibilities in memory technology, ushering in an era of intelligent and efficient electronics.

Bioinspired AlFeO3 Memristor with Sensing, Storage, and Synaptic Functionalities

• Mubashir Mushtaq Ganaie, Amit Kumar, Amit K. Shringi, Satyajit Sahu, Michael Saliba, Mahesh Kumar
• Memristors integrate sensing, storage.
• AlFeO3 enhances device performance.
• Crossbar arrays face challenges.
• Inspired by neural systems.
• RRAM enables efficient computing.

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•  In-Sensor Computing: AlFeO3-based resistive switching devices integrate sensing, storage, and computing capabilities, mimicking biological nervous systems.
•  Energy Efficiency: These devices offer low power consumption and efficient data processing due to in-memory computing and sensing.
•  Material Innovation: AlFeO3 demonstrates stability and multifunctionality, integrating resistive switching with magnetoresistance for advanced memory applications.
•  Device Design: The devices utilize two-terminal scalable crossbar arrays, enhancing density and performance while addressing sneak currents.
•  Thermal Stability: They exhibit robust operation under high thermal stress, crucial for reliability in various applications.
•  Gamma Radiation Sensing: Capable of detecting gamma radiation levels, making them suitable for dosimetry applications.
•  Dynamic Switching: These devices exhibit dynamic switching behaviors, including multilevel and bidirectional threshold and memory switching.

•  Indium-based Alternatives: Indium-based III-V and I-III-VI2 compounds are promising for their environmentally friendly nature but face challenges like broad emission and low quantum yield in the NIR region.
•  Advancements in InP QDs: Recent advancements include growing larger-sized InP QDs and passivating them with alumina, resulting in narrow linewidth, stable NIR emission suitable for biological imaging and LEDs.
•  Biocompatibility: Alumina passivation enhances biocompatibility and stability of InP-based QDs, making them suitable for biological applications.
•  Structural Characterization: Detailed characterization using TEM, HRTEM, XRD, and XPS confirms the formation of core-shell structures and alumina passivation.
•  Optical Properties: InP/ZnSe/ZnS/Al2O3 QDs exhibit high PLQY of 42.5% and narrow linewidth of 107 meV at 725 nm, crucial for efficient NIR emission.
•  Future Directions: Future research could focus on further improving quantum yield and exploring additional surface passivation strategies to enhance stability and functionality in biological environments.

The driving force behind this research was the pursuit of environmentally friendly and biocompatible alternatives to the traditional cadmium-based quantum dots. The findings of this study mark a significant step towards achieving this goal, offering a promising solution in the form of InP-based quantum dots with superior performance and versatility.

This study employed a sophisticated synthetic approach, leveraging the unique properties of InP quantum dots to develop a core–shell–shell structure comprising InP/ZnSe/ZnS/Al2O3. The carefully designed structure allowed for the precise tuning of the QDs’ emission wavelength, leading to efficient deep-red light emission with a narrow peak width, which is crucial for various optoelectronic and biological applications.

This research culminated in the successful synthesis of InP-based quantum dots capable of emitting light with a wavelength of up to 725 nm, demonstrating a narrow peak full width at half maximum (FWHM) of 107 meV. The alumina-coated QDs exhibited an enhanced photoluminescence quantum yield (PLQY) and environmental stability, further cementing their potential for advancing optoelectronic technologies and bio-applications.

The introduction of these water-soluble alumina-coated InP-based quantum dots represents a significant milestone in the field of nanomaterials, offering a viable alternative to their cadmium-based counterparts. This development holds immense promise for a wide range of applications, including deep-red light-emitting diodes (LEDs), biological imaging, and bioassays, reflecting the profound impact of this research on next-generation technologies.

Visible-Light-Promoted Enantioselective α-Amidation of Aldehydes by Harnessing Organo-Iron Dual Catalysis

• Avijit Saha, Ranjana Yadav, Céline Rivaux, Dmitry Aldakov, Peter Reiss
• InP-based QDs show promise in NIR applications.
• Challenges include toxicity and emission efficiency.
• Alumina passivation enhances stability and emission quality.
• InP QDs are viable alternatives to toxic Cd-based QDs.
• Current challenges include broad emission and low PLQY.
• Alumina passivation improves PLQY by approximately 10%.

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Researchers have shown how evolutionary principles can be used to create and improve molecular structures, advancing the field of artificial life. Scientists made a recent discovery published in Nature Chemistry. They found that a special DNA template can guide the creation and development of artificial molecules, giving us insight into how life began.

Cracking the Code of Artificial Life: How DNA-Like Templates are Steering Chemical Evolution in the Lab

• Selection rules in dynamic combinatorial libraries (DCLs) guide the formation of oligomers under non-equilibrium conditions, akin to genotype-phenotype interactions in evolution.
• DNA-based templates like dA10 facilitate controlled oligomerization, enhancing oligomer stability and selectivity in solution and coacervate models.
• Coacervate-based models demonstrate enhanced fusion behavior and purification capabilities due to template-controlled DCLs.
• Fuel-driven oligomerization within coacervates increases internal viscosity, potentially enhancing electrode material stability.
• Understanding selection mechanisms aids in developing tailored electrode materials for high-performance supercapacitors.
• Research highlights potential for designing novel DCLs for energy storage applications.
• Offers insights into mimicking biological evolution principles for advanced material design.

The Evolutionary Blueprint

The study, led by Job Boekhoven and colleagues, introduces a sophisticated setup where chemical evolution is orchestrated using designed templates. These templates are akin to the DNA that guides the biological processes in living cells. The experimental system hinges on Darwinian principles—selection and survival of the fittest—applied to molecules within a dynamic environment.

Here’s how it works: the researchers utilized a DNA-based template composed of repeated adenosine units (dA10) and thymine-functionalized isophthalic acid monomers. These components were chosen because their structural properties allow them to interact in an organized manner, triggering the formation of molecular chains called oligomers.

A Symphony in a Flask

The mimicry of life’s complexity was achieved with an ingenious method involving transient anhydride bonds. Simply put, these bonds can form and then break down readily, creating a lively, ever-changing environment for molecular evolution.

The process starts with a chemical agent, 1-ethyl-3-(3-dimethylaminopropyl)carbodiimide (EDC), which fuels the formation of oligomers. Initially, the predominant product was a dimer (DynT2). However, the presence of the dA10 template significantly influenced the outcome. As the reaction progressed and the ‘fuel’ depleted, the template helped accumulate higher forms of these molecular chains (DynT3-DynT5), thereby enhancing their survival.

From Molecules to Miniature Protocells

What’s truly fascinating is how the team translated these molecular dynamics into behavior reminiscent of living cells. In a coacervate model—tiny droplets emulating cell-like environments—the designed templates not only directed the formation of specific oligomers but also impacted the structural behavior of the droplets themselves.

These coacervates, which are non-living analogs to primitive cell prototypes, exhibited fusion behaviors regulated by the template-directed chemical evolution. In essence, the template acted much like genetic material, determining which molecules thrived and thereby affecting the ‘cell’s’ physical traits.

Why This Matters

This study propels our understanding of artificial life forward. By harnessing the principles of natural selection at the molecular level, researchers can now explore new vistas in synthetic biology and bioengineering.

Imagine creating smart materials that evolve based on environmental stimuli or designing entirely new forms of life with tailored functionalities. These findings open the door to such possibilities by demonstrating that we can indeed teach molecules the language of life.

The Road Ahead

While this is a major step, the journey towards creating fully functional artificial cells—life, as we typically understand it—is a long one. Nevertheless, this research provides a robust framework for future endeavors in the quest to replicate nature’s most elusive processes in a laboratory.

Stay tuned as science edges ever closer to turning the once fantastical notions of artificial life into tangible reality!

A template for artificial life

• Rahul Dev Mukhopadhyay
• DNA-based templates could revolutionize electrode material design, enhancing stability and performance.
• Coacervate models offer a promising platform for developing next-generation supercapacitors.
• Tailored DCLs hold potential for achieving higher energy densities and longer cycle life.
• Integration of selection rules into material design could lead to adaptive and self-improving supercapacitor materials.
• Opens avenues for bio-inspired approaches to energy storage with improved sustainability.

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• Hydrogen sulfide (H2S) is identified as a vital gasotransmitter in human physiology.
• Current methods involve small-molecule donors like Na2S, but they have limitations.
• Metal-organic frameworks (MOFs) offer a promising alternative for controlled H2S delivery.
• Na2S and NaSH are commonly used for H2S delivery but suffer from rapid release and toxicity risks.
• Low H2S levels are linked to skin disorders like psoriasis and chronic wounds.
• MOFs, like Mg2(dobdc), show potential for sustained H2S release with minimal toxicity.

The Power of Hydrogen Sulfide

Hydrogen sulfide is a naturally occurring gas in the body, known for its profound anti-inflammatory and antioxidant properties. It plays crucial roles in preventing inflammatory skin disorders and promoting wound healing. Despite its therapeutic potential, delivering H₂S effectively to affected areas has been a challenge due to its gaseous state and rapid diffusion.

Enter Metal–Organic Frameworks (MOFs)

MOFs are a class of materials consisting of metal ions coordinated to organic ligands, forming porous structures. These materials have been widely studied for their high surface areas and tunable properties, making them ideal candidates for gas storage and delivery.

The researchers, hailing from institutions such as Cornell University and the Korea Institute of Science and Technology, have ingeniously utilized MOFs with open metal sites to enable the controlled release of H₂S. This innovative approach ensures that H₂S can be effectively delivered through the skin, offering a sustained therapeutic effect.

Key Findings and Methodology

The study outlines a series of meticulous experiments to synthesize and characterize MOFs capable of adsorbing and releasing H₂S. By strategically selecting and designing MOFs with open metal sites, the team achieved the desired properties for efficient H₂S storage and delivery. The detailed procedures included:

1. Synthesis of MOFs:
   The team synthesized various MOFs and characterized them using advanced analytical techniques to ensure the materials had the appropriate porosity and stability.
2. Adsorption Studies:
   They conducted adsorption studies to determine the capacity of the MOFs to store H₂S, ensuring that the materials could hold a significant amount of the gas.
3. Transdermal Delivery Tests:
   Finally, they tested the ability of these MOFs to release H₂S through the skin, demonstrating successful transdermal delivery.

The results were promising, showing that MOFs with open metal sites could indeed facilitate the controlled release of H₂S, making it a viable option for therapeutic applications.

Significance and Future Implications

This innovative approach to transdermal H₂S delivery has far-reaching implications for the treatment of skin disorders and wound healing. By ensuring a sustained release of H₂S, this method could enhance the therapeutic effects, reduce inflammation, and accelerate healing processes. Moreover, this study opens the door to further research into gasotransmitter delivery systems, potentially benefiting a wide range of medical applications.

The team’s work not only highlights the potential of MOFs in medical applications but also showcases the importance of interdisciplinary collaboration in pushing the boundaries of science. The successful integration of chemistry, materials science, and biomedical engineering in this study serves as a testament to the power of collaborative innovation.

Transdermal Hydrogen Sulfide Delivery Enabled by Open-Metal-Site Metal–Organic Frameworks

• Aishwarya Agarwal, Aswathy Chandran, Farheen Raza, Irina-Maria Ungureanu, Christine Hilcenko, Katherine Stott, Nicholas A. Bright, Nobuhiro Morone, Alan J. Warren & Janin Lautenschläger
• Gasotransmitter Importance: H2S is crucial for human physiology, influencing inflammation and oxidative stress.
• Limitations of Na2S: Rapid release and toxicity risks hamper its therapeutic use.
• MOFs as Alternatives: Mg2(dobdc) and other MOFs offer controlled and sustained H2S release.
• Application in Dermatology: Potential treatments for psoriasis and chronic wounds.
• Future Directions: Research focuses on optimizing MOFs for safe and effective H2S delivery.

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• Innovation: Organocatalytic atroposelective synthesis of N-aryl phthalimides using mild conditions and N-heterocyclic carbene (NHC) catalysis.
• Methodology: Activation of phthalamic acid with pivaloyl chloride (PivCl) followed by NHC-catalyzed amidation to yield N-aryl phthalimides.
• Versatility: Strategy extended to the atroposelective synthesis of N-aryl maleimides with comparable efficiency.
• Enantioselectivity: Products obtained in excellent yields and high enantioselectivities (up to 99% yield and 98:2 er).
• Mechanistic Insight: Formation of acylazolium intermediates crucial for atroposelective amidation confirmed through mechanistic studies.
• Rotational Barrier: C-N axial chirality demonstrated stable configuration up to 70°C, providing insights into potential applications.
• Synthetic Utility: Derivatives suitable for further synthetic transformations, showcasing broad applicability.

Expanding Horizons in Bioactive Compound Creation

N-aryl phthalimides and maleimides are highly sought-after due to their critical role in bioactive chemical formulations. For example, the well-known drug thalidomide, used to treat multiple myeloma and tuberculosis, features a phthalimide structure. Similarly, the medication apremilast, used for psoriatic arthritis, falls within this compound class. Beyond medical applications, these compounds are also integral as catalysts, dyes, and vital components in polymer production.

Traditionally Daunting Processes

Historically, creating these compounds necessitated the condensation of phthalic anhydride and aniline derivatives under severe conditions, presenting challenges such as limited yield and selectivity. Therefore, scientists have been motivated to find more benign and efficient alternatives.

Breakthrough Synthetic Approach

This seminal study details a process utilizing N-heterocyclic carbene (NHC) catalysts to achieve atroposelective amidation. The crucial step is the in-situ activation of phthalamic acid, followed by NHC-catalyzed atroposelective amidation. This novel technique produces intricately decorated N-aryl phthalimides with exceptional yields and enantioselectivities.

Mechanistic Exposition

Through comprehensive mechanistic exploration, the researchers demonstrated that the NHC contributes to the formation of isoimides generated in situ, establishing a distinct synthesis pathway that creates acylazoliums. Notably, this method allows the production of both enantiomers from the same starting materials (phthalic anhydride and aniline) with a single NHC pre-catalyst.

Broader Implications and Applicability

The impact of this research extends beyond N-aryl phthalimides, demonstrating effectiveness in the atroposelective synthesis of N-aryl maleimides, thus showcasing its versatility and practical utility.

Prospective Future Directions

This innovative method has the potential to transform synthesis processes for a range of bioactive compounds, potentially leading to new pharmaceuticals, advanced materials, and catalysts. The mild conditions and high efficiency of this approach highlight its importance, offering a straightforward and desirable route for producing significant compounds.

The scientific community eagerly anticipates the broader application of this methodology, expecting it to spark further advancements in organic synthesis and its industrial and scientific applications.

N-heterocyclic carbene-catalyzed atroposelective synthesis of N-Aryl phthalimides and maleimides via activation of carboxylic acids

• Soumen Barik, Sowmya Shree Ranganathappa & Akkattu T. Biju
• Organocatalytic synthesis of N-aryl phthalimides
• Mild conditions and high yields
• Mechanistic insights into reaction pathway
• Innovative organocatalytic method for N-aryl phthalimide synthesis
• Traditional N-CC=O disconnection utilized under mild conditions
• Provides a novel method for mild synthesis of N-aryl phthalimides via organocatalysis.
• Mechanistic insights into the formation of acylazolium intermediates.
• Allows access to both enantiomers using the same starting materials and catalyst.
• Excellent yields and high enantioselectivities achieved in product formation.
• Extends to the synthesis of N-aryl maleimides using similar methodology.

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• LABs offer theoretical energy densities ten times greater than LIBs but face challenges like slow cathode kinetics and poor discharge product management.
• Research from IIT Indore pioneers using machine learning (ML) to enhance LAB efficiency.
• Extreme gradient boosting regression (XGBR) identified efficient dual metal site catalysts (DMSCs) surpassing platinum-based cathodes.
• ML model based on density functional theory (DFT) and SHapley Additive exPlanations (SHAP) analyzed 676 DMSCs across transition metals.
• Key factors like LiO2 adsorption energy and d-electron count crucial for catalyst performance. Interpretability via SHAP analysis enhances understanding of catalyst performance in LABs.
• Research promises strides in sustainable energy storage, advancing towards greener technologies.

Enter the lithium-air battery (LAB), a next-generation powerhouse that boasts a theoretical energy density ten times greater than that of LIBs. However, the nonaqueous LABs face significant challenges, particularly sluggish cathode kinetics and poor discharge product management, which impede their commercialization. This is where new research from the Department of Chemistry at the Indian Institute of Technology (IIT) Indore shines a spotlight.

The study, titled “Unlocking the Efficiency of Nonaqueous Li–Air Batteries through the Synergistic Effect of Dual Metal Site Catalysts: An Interpretable Machine Learning Approach,” seeks to revolutionize LAB technology. Led by Biswarup Pathak, this research leverages a machine learning (ML) algorithm to identify highly efficient electrocatalysts for LABs by screening various dual metal site catalysts (DMSCs).

The research utilizes extreme gradient boosting regression (XGBR) to systematically explore different combinations of transition metals. The outcome is an identification of catalysts that surpass even the novel platinum-based cathodes in overall performance.

The team embarked on a data-intensive journey, where density functional theory (DFT) calculations underpinned the ML training process. The predictive model was built from a dataset comprising 676 DMSCs, varied across 3d, 4d, and 5d series transition metals. The researchers emphasized the significance of the LiO2 adsorption energy as a descriptor for the catalytic performance of these DMSCs due to its strong correlation with the overpotential of lithium oxidation reactions.

The trained XGBR model excelled in predicting the adsorption energy of unknown DMSCs, revealing that the number of d-electrons in the transition metals played a crucial role in catalytic activity. Additionally, the Coulomb interaction energy provided further insights into the ionic interactions of DMSCs with LiO2, thus explaining the adsorption behavior of the most efficient catalysts.

Utilizing SHapley Additive exPlanations (SHAP) analysis, the team interpreted the ML predictions, clarifying the contributions of individual features such as electronegativity, ionization energy, and atomic radius to the overall catalytic performance. This interpretability is crucial for understanding and forecasting new catalyst combinations.

About the Authors:

• Nishchal Bharadwaj: Researcher specializing in electrochemistry and catalyst design.
• Surya Sekhar Manna: Expert in materials chemistry with a focus on renewable energy solutions.
• Milan Kumar Jena: Researcher with a background in computational chemistry and data science.
• Diptendu Roy: Focuses on functional materials and energy storage technologies.
• Biswarup Pathak: Corresponding author and professor at IIT Indore, leading advancements in chemical research for sustainable technologies.

Unlocking the efficiency of nonaqueous Li–air batteries through the synergistic effect of dual metal site catalysts: an interpretable machine learning approach

• Nishchal Bharadwaj, Surya Sekhar Manna, Milan Kumar Jena, Diptendu Roy, and Biswarup Pathak
• ML identifies efficient DMSCs for LABs by predicting catalytic activity of transition metal pairs.
• LABs demand efficient ORR/OER catalysts; DMSCs present a promising solution.
• Future applications leverage ML to design advanced DMSCs for enhanced LAB efficiency.
• LABs promise high energy density but face challenges like sluggish cathode kinetics.
• Efficient ORR/OER catalysts are essential for enhancing LAB performance.
• Current research focuses on developing cost-effective DMSCs to improve LAB efficiency.

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•  Epithelial Cell Monolayers and Tissues Overview:
  • Epithelial cell monolayers are densely packed environments where remodeling and cancer cell migration occur.
  • Processes involve local flow and a jamming-unjamming transition influenced by density changes and cell deformability.
  • Cell shape changes drive unjamming, impacting pathophysiology in conditions like asthma and cancer progression.
•  Synthetic Cell-Mimics Creation:
  • Developed deformable, active cell-mimics using paper rings enclosing chiral active ellipsoids.
  • Ellipsoids exhibit persistent active torques, influencing their motility and shape within the paper rings.
•  Re-entrant Jamming Behavior:
  • Observed in synthetic cell-mimic assemblies at near-confluence densities.
  • Intermediate activity levels lead to fluid-like dynamics despite high cell density, correlating with cell shape variability.
•  Cell Shape and Dynamics Correlation:
  • Cell aspect ratio (AR) and shape variability (SD(AR)) are correlated with structural relaxation dynamics.
  • Systems with higher AR and SD(AR) exhibit faster relaxation dynamics, indicative of fluid-like behavior.
•  Dynamical Heterogeneities:
  • Faster relaxing cells show suppressed shape variability compared to slower cells within dense assemblies.
  • Local dynamical heterogeneities mirror those observed in natural cell systems, suggesting a universal behavior in dense cell collectives.

Arora, along with co-researchers Sadhukhan and Nandi, embark on a deep exploration of the mechanics and statistics of active matter. Until recently, understanding how synthetic cells interact and migrate remained a challenging issue. Their study, cited as “A shape-driven reentrant jamming transition in confluent monolayers of synthetic cell-mimics,” presents a comprehensive examination of synthetic cell dynamics and their jamming behaviors.

The reentrant jamming transition refers to the phenomenon in which a system transitions from a fluid-like state to a solid-like state and back to a fluid-like state owing to changes in conditions, such as shape or density. By leveraging cutting-edge experimental techniques and rigorous formal analysis, the team provided invaluable insights into how these transitions can be influenced by the shape of cell mimics.

Their findings not only illuminate the dynamics of synthetic biological materials but also set the stage for innovations in designing responsive, active materials for various applications. This research represents a collaborative effort on multiple fronts, with validated methodologies and thorough investigation under the supervision and conceptualization of Rajesh Ganapathy.

Furthermore, the publication pays homage to those in the peer review process who contributed their time and expertise to ensure the robustness of the study. Nature Communications acknowledges Hamid Kellay, Paolo Malgaretti, and other anonymous reviewers for their contributions.

Intriguingly, the results feature extensive supplementary materials, including seven distinct supplementary movies, providing visual and dynamic insights into their experiments. These supplements enhance the comprehensibility and impact of the research, allowing for a broader understanding of the behavior and implications of synthetic cell mimics.

In the spirit of open science, publication is licensed under a Creative Commons Attribution 4.0 International License. This allows for the use, sharing, and adaptation of the research, provided that appropriate credit is given to the original authors. This approach signifies a commitment to the open dissemination of scientific knowledge, fostering advancement, and innovation across the scientific community.

This landmark study marks a significant milestone in the realm of active matter, paving the way for future research and potential practical applications in materials science and bioengineering. As the scientific community continues to digest and build upon these findings, one thing becomes clear: the microscopic world of synthetic cells holds the key to extraordinary discoveries, shaping our understanding of material behaviors at the most fundamental levels.

For further details, interested parties can reach out to the corresponding authors, Pragya Arora and Rajesh Ganapathy. Full access to the article and supplementary materials can be found on the official Nature Communications website.

About Nature Communications:

Nature Communications is a peer-reviewed, open-access scientific journal covering the natural sciences. This journal publishes high-quality research across a wide range of fields, promoting the dissemination of scientific discovery.

A shape-driven reentrant jamming transition in confluent monolayers of synthetic cell-mimics

• Pragya Arora, Souvik Sadhukhan, Saroj Kumar Nandi, Dapeng Bi, A. K. Sood & Rajesh Ganapathy
• Cell shape influences jamming transitions similar to inert particle packings.
• Shape variability correlates with cell aspect ratio across different epithelial systems.
• Re-entrant jamming transition observed with synthetic cell-mimics at intermediate activity levels.
• Synthetic active cell-mimics created using chiral ellipsoids and paper rings.
• Activity levels (τp) affect cell motility and shape variability.
• Universal k-gamma distribution observed in cell shape variability.
• Dynamics correlate with cell shape and variability in synthetic and natural cell systems.

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