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研究论文

镍氧化膜对 H_2PO_2~- 电氧化的去活化效应

  • 蒋太祥
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  • 厦门大学化学系!固体表面物理化学国家重点实验室厦门361005,厦门大学化学系!固体表面物理化学国家重点实验室厦门361005

收稿日期: 1999-08-28

  修回日期: 1999-08-28

  网络出版日期: 1999-08-28

Deactivation of Nickel Oxide/Hydroxide to Electrooxidation of H 2PO - 2 Anions on Nickel Electrodes in Alkaline Solutions

  • Jiang Taixiang Wu Huihuang
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  • (Dept. of Chem.,Xiamen Univ. and State Key Lab. for Phys.Chem. of the Solid Surfaces, Xiamen 361005,P.R.China

Received date: 1999-08-28

  Revised date: 1999-08-28

  Online published: 1999-08-28

摘要

应用开路 电位 测 量和 循 环 伏 安 法研 究 碱 性 介 质中 H2 P O-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. H2 P O-2 的 氧 化发 生 在 较负 的 电位 范 围, H P O2 -3 为 氧 化 的 最终 产物. H2 P O-2 的 氧化过程 分为 H2 P O-2 吸附 、 P- H 键断 裂、活性 中间 物形 成及 其氧 化等 步骤 . H2 P O-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 .

本文引用格式

蒋太祥 . 镍氧化膜对 H_2PO_2~- 电氧化的去活化效应[J]. 电化学, 1999 , 5(3) : 261 -266 . DOI: 10.61558/2993-074X.3185

Abstract

Electrooxidation of hypophosphite anions on polycrystalline nickel in alkaline solutions has been investigated by cyclic voltammetry and open circuit potential measurements.The results are explained based on the mechanism that the first step of hypophosphite oxidation is the adsorption of hypophosphite ions on nickel,followed by the homolysis of its hydrogen bond with the formation of radicals.The oxidation of hypophosphite on nickel in alkaline medium occurs at lower potentials between ca.-0.8 V—-1.1 V(SCE)and phosphite ion is the only oxidation product.There is no indication of hypophosphite oxidation at higher potentials.Severe deactivation of the surface occurs when the nickel surface is covered with surface oxide/hydroxide films which separates the hypophosphite ion from nickel substrate.The results show that the rate of the anodic oxidation of hypophosphite depends strongly on the nature of the nickel substrate,operation temperature,hypophosphite concentration and sweep rate.

参考文献

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