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电化学  1999 

镍氧化膜对H_2PO_2~-电氧化的去活化效应

, PP. 261-266

Keywords: 次亚磷酸盐,电氧化,镍电极

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Abstract:

应用开路电位测量和循环伏安法研究碱性介质中H2PO-2在镍电极上的电氧化过程,并对镍氧化膜的去活化机理进行了探讨.结果表明,镍电极在碱性介质中由于氧化膜的快速形成而显示出明显的非催化活性.H2PO-2的氧化发生在较负的电位范围,HPO2-3为氧化的最终产物.H2PO-2的氧化过程分为H2PO-2吸附、P-H键断裂、活性中间物形成及其氧化等步骤.H2PO-2与活性镍充分的相互作用是形成活性基团及随后氧化的必要条件.

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