在NaOH溶液中铜电极钝化的机理

THE MECFANISM FOR THE PASSIVATION OF COPPER ELECTRODE IN NaOH SOLUTION

本文研究了铜阳极在纯NaOH溶液中的电化学钝化行为。实验发现,在电极上生成不溶Cu_2O及CuO,使电极发生钝化。论文还详细讨论了生成Cu_2O钝化膜的机理。

This paper discussed the electrochemical behaviours for the passivation ofa copper electrode in NaOH solution. It has been found that the formation ofinsoluble Cu_2O and CuO at electrode surface is the reason for the occurrence ofpassivation. The mechanism for forming Cu_2O at the electrode surface is consideredto be as follows. Cu+OH^-[Cu(OH)]ads+e^- (1) [Cu(OH)]ads+OH^-Cu(OH)_2^- (2) Cu(OH)_2^-+CuCu_2O+H_2O+c^- (3)Reaction(3) is the rate-determining step.