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分别用恒电位阶跃法、恒电流放电法和电化学阻抗法研究了不同荷电状态和不同温度下MlNi3.75Co0.65Mn0.4Al0.2贮氢合金电极中氢的扩散系数,并对各种方法的测试结果及其在实际应用中的优缺点进行了比较和讨论。测试结果表明,室温下MlNi3.75Co0.65Mn0.4Al0.2贮氢合金电极中氢的扩散系数随其荷电量的增大而减小;同一荷电状态的Ml-Ni3.75Co0.65Mn0.4Al0.2贮氢合金电极中氢的扩散系数随温度的升高而增大;该电极中氢扩散的活化能为17.9kJ/mol~19.8kJ/mol。
The diffusion coefficients of hydrogen in MlNi3.75Co0.65Mn0.4Al0.2 hydrogen storage alloy electrode under different states of charge and different temperatures were investigated by potentiostatic step method, galvanostatic method and electrochemical impedance spectroscopy. The test results of the method and its advantages and disadvantages in practical application are compared and discussed. The test results show that the diffusion coefficient of hydrogen in the MlNi3.75Co0.65Mn0.4Al0.2 hydrogen storage alloy electrode decreases with the increase of the charge amount at room temperature. The same charge state of Ml-Ni3.75Co0.65Mn0.4Al0. The diffusion coefficient of hydrogen in hydrogen storage alloy electrode increases with the increase of temperature. The activation energy of hydrogen diffusion in this electrode is 17.9kJ / mol ~ 19.8kJ / mol.