Tuesday, June 18, 2024

Scientists Construct High-Energy-Density Flexible Supercapacitors

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Researchers develop high-energy-density flexible supercapacitors taking advantage of transition metal nitrides.

Transition metal nitrides (TMNs) are potential electrode materials for high-performance energy storage devices, but the structural instability severely hinders their application. Therefore, it is highly important to construct advanced cathode materials for flexible, wearable, long-life and high-energy-density energy storage devices.

A research team led by Prof. Zhao Bangchuan from the Institute of Solid Materials of the Hefei Institutes of Physical Science (HFIPS) have constructed a high-energy-density flexible supercapacitor device by synthesizing 3D porous honeycomb-like CoN-Ni3N/N-C nanosheets and vanadium nitride (VN) nanobelt arrays via ion-site growth method, respectively. 

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Experiments suggest that the intrinsic conductivity was enhanced, and concentration of the active sites was increased. This, according to the researchers, gives advantage to the optimized CoN-Ni3N/N-C/CC, which can be used as an integrated electrode for the supercapacitor to achieve remarkable electrochemical performance.

The developed supercapacitor delivers an energy density of 106 μWh per cm^2 with maximum power density of 40 mW cm^-2 with high stability.

According to the researchers, this work provides a viable strategy to construct high-energy flexible wearable electronics in the next-generation electrochemical energy storage field.

The research appeared in the journal Advanced Functional Materials.



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