Hybrid metal oxides possess the favorable features of each component and are proven suitable candidates for supercapacitors. However, the construction of hybrid metal oxides with intricate hollow arch...

“STAY OFF GROOMED SURFACES” headlined the resurfacing status page as I skimmed alongside the track groomer, staying well clear of the hundred meter booms snowing frozen nitrogen onto the drag strip. C...

A flexible supercapacitor with outstanding low-temperature and mechanical performance is developed using a cation−π hydrogel electrolyte and carbon nanotube composite electrodes. Na + −indole crosslinking sites within the hydrogel enhance mechanical strength, fatigue resistance, and ion transport, enabling it with excellent mechanical and electrochemical performance. Strong adhesion ensures reliable operation under bending and dynamic movements. Abstract Flexible supercapacitors are promising power sources for new-generation wearable electronics. However, their electrochemical performance often deteriorates under mechanical deformation and low-temperature environments. Here, a flexible supercapacitor is developed by sandwiching a hydrogel electrolyte between two electrodes. To address performance challenges, cation−π crosslinking sites are incorporated into the hydrogel network. These dynamic crosslinking sites act as efficient ion-hopping centers, imparting the hydrogel electrolyte with high fracture strength (1.8 MPa), strong ionic conductivity (3.9 S m −1 ), and excellent anti-freezing properties. Furthermore, the hydrogel forms cation−π interactions with carbon nanotube-based composite electrodes, facilitated by the reaction between the indole groups and Na + in the electrodes. This strong interfacial bonding minimizes electrode–electrolyte displacement during deformation, reducing interfacial resistance and enhancing charge transport efficiency. As a result, the cation−π hydrogel electrolyte enables the supercapacitor to achieve high energy storage, outstanding mechanical deformation tolerance, and robust performance at low temperatures. The device maintains 89.8% of its initial capacitance after 5000 bending cycles and retains 70.9% capacitance at −40 °C—significantly surpassing previously reported methods. This work presents an innovative strategy for designing high-performance hydrogel electrolytes for advanced energy storage systems.

This study explores the covalent functionalization of Ti3C2Tx using 5,5′-bis(triisopropoxysilyl)-2,2′-bipyridine in different solvents, revealing that only m-xylene enables effective covalent bonding...

New York, Wednesday, 15 October 2025.The supercapacitors market is expected to grow from USD 6.49 billion in 2025 to USD 27.99 billion by 2035, driven by transport electrification and renewable energy

This study explores polyoxometalate-based hybrids with varying dimensionalities, linking molecular, polymeric, and framework structures to supercapacitor performance. The results highlight how struct...

The breakthrough carbon cement supercapacitor features exceptional electrochemical performance and excellent robustness. The porous carbon cement electrode, characterized by high strength, extremely low resistance, is prepared by thermomechanical consolidation at 90 °C. Through in situ polymerization around sodium dodecyl sulfate-mediated carbon black (CB) surfaces, a CB-hydrogel network is built inside the multiscale pore structure of the cement electrode. Abstract The rapid deployment of renewable energy demands cost-effective and scalable energy storage solutions. While cement-based supercapacitors offer transformative potential, their development is hindered by charge storage capacity, mechanical strength, and environmental stability. Herein, a breakthrough carbon cement supercapacitor (CCS) with exceptional electrochemical performance and excellent robustness is engineered. The porous carbon cement (CC) electrode, characterized by high strength, extremely low resistance, and high-connectivity conductive hydrogel electrolyte, is prepared by thermomechanical consolidation at 90 °C. Through in situ polymerization around sodium dodecyl sulfate (SDS)-mediated carbon black (CB) surfaces, a CB-hydrogel network is built inside the multiscale pore structure of the carbon-cement electrode. The CCS exhibits a leading areal capacitance (1708 mF cm − 2 ), over 83% capacitance retention after 10 000 cycles, high strength (>8 MPa), 92.2% capacitance retention under extreme loading conditions, a wide operating temperature range from −20 to 80 °C with less than 9% capacitance fluctuation, and incombustibility. This new device exhibits potential to revolutionize energy-storage systems.

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Researchers report on new heat-based fabrication methods to transform PET into supercapacitor electrodes and separator films for upcycled energy storage devices.