Electrochemical modification and its effect on the pseudocapacitive properties of a graphite electrode
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摘要:
通过多种电化学测试技术评价了石墨电极在 2. 3mol/ L H 2 SO 4 溶液中的电化学活化工艺及其准电容性能。 结果表明,活化工艺宜采用恒电流阶跃技术,最佳工艺参数为:阳极电流密度为 200 mA · cm -2 ,阴极电流密度为-120 mA · cm -2 ,对应活化时间分别为 300s 和 100s, 循环 6 次。 改性后的石墨电极表面形成了多孔、粗糙的三维活性层,单位面积上具有较高的电容量(2. 08 F · cm -2 )和良好的倍率特性,可作为一种优异的准电容器材料。
Abstract:A graphite electrode (GE) was modified in a 2. 3 mol/ L H2SO4 solution using GE as a working electrode, Pt as a counter electrode andsaturatedcalomelelectrode (SCE) as a reference electrodeby a galvanic method under a constant current. Results showed thatafter the GE was optimally modified at a current of 200 mA for 300 s and -120 mA for 100 s for 6 cycles, it had a porous, rough and three-dimensional active layer with a pseudo capacitance of 2. 08 F/ cm 2 . The modified GE had a much lower resistance and higher sweep rate than the unmodified one
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