电化学剥离重构炭纸制备锌离子电容器无黏结剂电极OA

Zinc-ion supercapacitors(ZISCs)have received consider-able interest for energy storage because of their low cost,high safety,and minimal environmental impact.However,they have a low en-ergy density and poor cycling performance.The design of a better cathode material is needed to overcome these limitations.A simple method was used to synthesize binder-free electrochemically exfoli-ated carbon paper(EECP)which modifies the surface of the paper by introducing oxygen functional groups and thus improves its pseudo-capacitance.When used in a Zn-ion supercapacitor(ZISC),an EECP-based cathode provides a large surface area and quick charge transfer.As a result,the ZISC had remarkable charge storage properties and had a dominant capacitive-type charge storage mechanism with 78.8%retention of capacity at 10 mV/s of the total storage.Furthermore,at 1 A/g,the EECP electrode had a maximum capacitance of 252.5 F/g.The EECP electrode re-tained 81.7%of its capacitance after 10 000 cycles,indicating its promise for use in the growing renewable energy sector.A ZISC was also constructed using EECP as the positive electrode and Zn as the negative electrode with a 1 mol L-1 ZnSO4 elec-trolyte.It had a capacitance of 186.22 F/g at 1 A/g and a 97.01%retention rate after 10 000 cycles.It also had an excellent en-ergy density of 46.6 Wh/kg at a power density of 500.4 W/kg.The material is therefore suitable for use in high-rate next-gener-ation ZISCs.