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Citation: Jin Shixiong, Wang Lan, Zhu Zhi'ang. KINETICS AND MECHANISMS OF OXYGEN EVOLUTION ON Pt ANODE IN HCIO₄ and H₂SO₄ SOLUTIONS[J]. Chinese Journal of Applied Chemistry, ;1990, 7(6): 37-42. shu

KINETICS AND MECHANISMS OF OXYGEN EVOLUTION ON Pt ANODE IN HCIO₄ and H₂SO₄ SOLUTIONS

1.
Department of Chemistry, Nankai University, Tianjin 300071

Received Date: 7 July 1989
Available Online: 7 April 1990

in φ-lgi relations steady-state were determined for the O₂ evolution on Pt electrode in HClO₄ and H₂SO₄ solutions of concentrations from 0.05-40mol·kg^-1. There are three re-gions on the φ-lgi curves. The first is the lower overpotential region with ðφ/ðlgi=2.303 RT/βF (β=0.5), followed by the second potential jump region, and then the third region again with a Tafel slope of approximately to 2.303θRT/βF. The reaction order of O₂ evolu-tion with respect to a_w was found to be 1 in the first and second regions, while in thethird region the reaction order of O₂ evolution with respect to a_w·a_ClO4^- or a_w·a_HSO4^- was found to be 1/2. Possible mechanisms for oxygen evolution were proposed. Some of them explain quite satisfactorily the difference in Tafel slope in different region of polarization curves and the various order of reaction with respect to different reactants.
- oxygen evolution,
- platinum anode,
- kinetics,
- mechanism
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KINETICS AND MECHANISMS OF OXYGEN EVOLUTION ON Pt ANODE IN HCIO₄ and H₂SO₄ SOLUTIONS