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测定了二氧化铅电极上氧发生反应的交流阻抗。用曲线拟合法解析组抗谱,求得了反应电阻R_t、吸附电阻R_a、双层电容C_d、吸附电容C_a的值。认为(OH)吸+H_2O→(O)吸+H_3O~++e~-是氧发生反应的控制步骤。讨论了C_d、C_a与OH~-离子浓度变化的关系。
The impedance of the lead dioxide electrode for oxygen reaction was measured. The impedance spectrum was analyzed by curve fitting, and the values of the reaction resistance R_t, the adsorption resistance R_a, the double-layer capacitance C_d and the adsorption capacitance C_a were obtained. That (OH) + H_2O → (O) + H_3O ~ + + e ~ - oxygen is the reaction of the control step. The relationship between C_d, C_a and OH ~ - ion concentration was discussed.