假电容
电解质
化学
超级电容器
电容
石墨烯
电化学
电导率
比表面积
化学工程
物理化学
电极
有机化学
催化作用
工程类
作者
Xinping Yang,Wei Feng,Xinyi Wang,Jinglin Mu,Chao Liu,Xiaozhong Wu,Pengfei Zhou,Jin Zhou,Shuping Zhuo
标识
DOI:10.1016/j.jelechem.2022.117010
摘要
To investigate the effect of structural properties of fluorinated graphene (FG) on the supercapacitive properties in KI additive electrolyte, the porous structure and surface F element content of FG were adjusted via chemical reduction by hydrazine and heating treatment. Systematically electrochemical measurements show that there is a dramatical increase of specific capacitance (583 F/g) in KI-additive electrolyte due to the pseudocapacitance brought by KI compared with that (17 F/g) in pure H2SO4 electrolyte. Investigation on the relationship between F content and areal capacitance show that small amount of F content, especially for semi-ionic C-F species with better electronic conductivity compared with covalent C-F species, can effectively promote the areal capacitance. With moderate F content and relatively high specific surface area, the assembled symmetric supercapacitor can deliver an energy density of 8.89 Wh kg−1 and exhibits a long cyclic stability.
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