Electrochemical impedance and cyclic voltammetry characterization of a metal hydride electrode in alkaline electrolytes
Electrochemical impedance and cyclic voltammetry characterization of a metal hydride electrode in alkaline electrolytes
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DOI：
10.1016/j.jallcom.2006.01.079
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发表时间：
2006-12
影响因子：
6.2
通讯作者：
Xiaofen Li;Hui-chao Dong;Ai-qiang Zhang;Yanwei Wei
中科院分区：
文献类型：
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作者：
Xiaofen Li;Hui-chao Dong;Ai-qiang Zhang;Yanwei Wei
报道了MmNi3.55Co0.75Al0.2Mn0.5金属氢化物电极在两种碱性电解液(氢氧化钠和氢氧化钾)中的电化学性能。电化学阻抗谱(EIS)和循环伏安法(CV)的结果表明，用NaOH电解液代替KOH电解液，可以明显抑制H原子在金属-电解液界面的吸附/脱附。这大大降低了负极活性物质的自分解速度，从而提高了镍-金属氢化物(Ni-MH)电池的自放电性能。
The electrochemical characterization of a MmNi3.55Co0.75Al0.2Mn0.5metal hydride electrode in two alkaline electrolytes (NaOH or KOH) is reported. The results from both electrochemical impedance spectroscopy (EIS) and cyclic voltammetry (CV) show that absorption/desorption of H atoms at the metal–electrolyte interface is markedly suppressed by using a NaOH electrolyte instead of a KOH electrolyte. This results in a significant reduction of the self-decomposition rate of the negative active material and thus leads to an improvement in the self-discharge performance of nickel–metal hydride (Ni–MH) batteries.