高等学校化学学报

高等学校化学学报 ›› 1995, Vol. 16 ›› Issue (5): 796.

• 研究简报 • 上一篇    下一篇

Ag+离子对Pt和PbO2电极上Mn2+氧化为Mn3+过程中Ag+的助催化作用

金世雄, 王岚, 周文峰   

  1. 南开大学化学系, 天津, 300011
  • 收稿日期:1994-05-18 修回日期:1994-08-09 出版日期:1995-05-24 发布日期:1995-05-24
  • 通讯作者: 金世堆,男,58岁,教授
  • 作者简介:金世堆,男,58岁,教授
  • 基金资助:

    国家自然科学基金

Promoting Catalysis of Anodic Oxidation of Mn2+to Mn3+Ionson Pt and PbO2 Electrodes by Silver(Ⅰ) Ion

JIN Shi-Xiong, WANG Lan, ZHOU Wen-Feng   

  1. Department of Chemistry, Nankai University, Tianjin, 300071
  • Received:1994-05-18 Revised:1994-08-09 Online:1995-05-24 Published:1995-05-24

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关键词: 铂电极, PbO2电极, Mn3+离子阳极形成, 氧的阳极析出, Ag+离子的助催化作用

Abstract: The influence of Ag+ions on the evolution of O2 and the anodic formation of Mn3+at Pt and Pb IPbO2 anodes was investigated in concentrated sulfuric acid solutions. The ki netic data related respectively to Mn3+anodic formation and O2 anodic evolution at Pt and Pb |PbO2 anodes in mixed H2SO4-MnSO4 solutions were measured by resolving the steady-state polarization curves. The Tafel slope of steady-state-lgi relationships for Mn3+anodic for mation reaction is close to 2×2. 303RT/βF, whereas for O2 anodic evolution it is close to 2. 303RT/βF(with β 0. 5). The influence of Ag+ions on the kinetics of evolution and Mn3+anodic formation at Pt and Pb|PbO2 electrodes was compared as a function of Ag+ions concentration. The O2 evolution and Mn3+formation rate increased uniformly with increasing Ag+ions concentration in the electrolytes. The kinetic data show that Mn3+anodic formation (i(Mn3+)) and O2 anodic evolution (i(O2)) increased by Ag+ions. Since the effect on I (Mn3+)was larger than that on i(O2) at the Pt electrode and smaller than that on i(O2) at the Pb |PbO2 electrode, the current efficiency of Mn3+formation increased at the Pt electrode and decreased at the Pb |PbO2 electrode.

Key words: Platinum electrode, Lead dioxide electrode, Anodic formation of Mn3+ion, An odic evolution of oxygen, Promoting catalysis of silver(Ⅰ) ion

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