超级电容器
电解质
氧气
电化学
电容
化学工程
活化能
化学
材料科学
无机化学
电极
有机化学
物理化学
工程类
作者
Yan Xiao,Xinyu Cai,Wei Sun,Fuqian Yang
摘要
In this work, oxygen-doped activated carbons (ACs) are derived from glucose by hydrothermal synthesis (HTS) and a two-step consecutive activation/treatment. The first KOH activation leads to the formation of well-developed hierarchical porous structure. The second H2O-steam treatment controls the fraction of oxygen contents ranging from 3.35 to 10.43 at% by regulating the treatment time and temperature. We propose a reaction for the oxygen reduction during the H2O-steam treatment, of which the resultant reaction rate increases with the increase of the treatment temperature. The nominal activation energy for the reaction is 18.79 kJ/mol. The symmetric supercapacitors with the ACs of the highest oxygen content exhibit the best electrochemical performances of an optimum specific capacitance of 240.49 F/g in the electrolyte of 1 M H2SO4. However, the symmetric supercapacitors with the ACs of the lowest oxygen content exhibit the best electrochemical performances of an optimum specific capacitance of 171.81 F/g in the organic electrolyte of 1 M Et4BF4 in AN.
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