高等学校化学学报

高等学校化学学报 ›› 1995, Vol. 16 ›› Issue (7): 1109.

• 论文 • 上一篇    下一篇

硫酸溶液中Ce3+离子在PbO2电极上阳极氧化过程动力学

金世雄, 温青   

  1. 南开大学化学系, 天津, 300071
  • 收稿日期:1994-07-05 修回日期:1995-01-06 出版日期:1995-07-24 发布日期:1995-07-24
  • 通讯作者: 金世雄,男,59岁,教授.
  • 作者简介:金世雄,男,59岁,教授.
  • 基金资助:

    国家自然科学基金

Kinetics of Anodic Oxidation of Ce3+Ion in Sulfuric Acid at the Lead Dioxide Electrode

JIN Shi-Xiong, WEN Qing   

  1. Department of Chemistry, Nankai University, Tianjin, 300071
  • Received:1994-07-05 Revised:1995-01-06 Online:1995-07-24 Published:1995-07-24

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摘要： 用"分解极化曲线"法研究PbO2电极上Ce4+阳极形成的动力学。测得电位在1.7～1.9V(vs.SCE)区域和高于1.9V区域的O2和Ce4+的极化曲线的Tafel斜率和两者的动力学方程。推测了PbO2电极上Ce4+形成和O2析出的机理及两区域内反应机理的差别。所推得的动力学方程均与实验相符。

关键词: PbO2电极, Ce3+离子阳极氧化, Ce4+离子阳极形成, 动力学与机理

Abstract: The kinetic data related respectively to Ce4+anodic formation and O2anodic evolution at PbO2electrode in 0. 5 mol/L H2SO4+x mol/L Ce2(SO4)3(x=0. 01-0. 10) and 0. 025 mol/L Ce2(SO4)3+x mol/L H2SO4(x=1. 09-4. 20) solutions were obtained by the method of resolving the steady-state polarization curve. Experiments show that the anodic formation of Ce4+and O2anodic evolution at PbO2electrode in the mixed H2SO4-Ce2(SO4)3solutions can be described by i(O2)=k1aw4expβφ F/RT,i(Ce4+)=k2aw2[Ce3+]expβφF/2RT at the potential region 1.7-1.9V and by i(O2)=k1aw4expβφF/RT, i(Ce4+)=k2aw2[Ce3+]expβφF/RT at the potential region above 1.9V (vs. SCE). On the basis of kinetics data thus obtained the mechanisms are proposed, which can be used to explain many experimental phenomena.

Key words: PbO2anode, Anodic oxidation of Ce3+ion, Anodic formation of Ce4+ion, Kinet-ics and mechanism

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