C/KOH/Ni(OH)_2非对称电容器活化过程电极行为

Electrode Performance of C/KOH/Ni(OH)_2 Hybrid Capacitor in Activation Process

通过对电极和电极材料的电化学性能测试,分析了C/KOH/Ni(OH)2非对称电容器在活化过程中的正、负电极行为。实验结果表明,表现双电层电化学行为的活性炭负极活化过程相对快速,30周循环后电极性能稳定;Ni(OH)2正极的活化是影响非对称电容性能的关键因素,活化过程中Ni3+在电极上积累,在添加剂的共同作用下,活性物质表层组成发生改变,电极的析氧电位升高,导电性改善,容量性质和快速充放电性能提高。

Some electrochemical tests were taken to analyze the electrode activating process of C/KOH/Ni(OH)_2 hybrid capacitor. The results proved that, the activation of activated carbon electrode, which was an electrode process of electric double-layer capacitor, would be carried out quickly. And the electrode capability would be stable after 30 cycles. The activation of Ni(OH)_2 electrode was the key factor to decide the performance of hybrid capacitor. Ni^(3+) would be accumulated in Ni(OH)_2 electrode, the constitution of the surface of activated material would be changed under the coaction of additives in the activating process. The OER (oxygen evolution reaction) potential of the electrode would be raised, the electric conduction, capacity and fast charge-discharge performance of the electrode would be improved.