非均相电解Mn^(2+)的电极过程动力学研究

Studies on the Electrode Kinetics of Electrooxidation of Mn 2+

选择ＰｂＳｂＡｓ合金为研究电极，通过阳极极化曲线确定了非均相电解氧化Ｍｎ２＋电极过程机理，即为在阳极上存在液相和固相两个反应；并确定在４０％Ｈ２ＳＯ４介质中Ｍｎ（Ⅲ）／Ｍｎ（Ⅱ）体系的条件电极电势为０．８８６４Ｖ．采用旋转圆盘电极研究得到在非均相电解ＭｎＳＯ４过程中电极过程控制步骤为电荷传递———浓度极化混合控制步骤，并确定了电极反应的动力学参数．

The mechanism of electrooxidation of MnSO 4 on Pb Sb As alloy anode was investigated by using rotating disc electrode technique. The results shown that the conditional standard potential of Mn(Ⅲ)/Mn(Ⅱ)in 40% H 2SO 4 is 0.886 4 V.The rate controlling step of electrode process is mixed controlled by charge transfer and diffusion.