多孔镍通过同时在水溶液中析出氢气及还原镍离子电沉积生成,其在强碱溶液中对乙醇表现出良好的电催化氧化效果.在1 mol/L KOH溶液中,多孔镍的电极反应为准可逆的p氢氧化镍与伊羟基氧化镍之间质子耦合电子转移.循环伏安图显示峰值电流密度与电势扫描速度平方根成线性关系,据此计算可得多孔镍的质子扩散系数值为2.92×10-8 cm2/s,其高于块状镍体系的质子扩散系数值约4个数量级,这可能由真实表面积增大导致.循环伏安法和计时电流法用来表征多孔镍对乙醇的电催化氧化能力,相对于(220)镍电极,多孔镍表现出更高的催化效率,计时电流法测量的催化反应速率常数为7.17×103 cm3/(mol·s).
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