Abstract
The oxygen electroreduction on the MnO2 electrode was investigated by analysis of the polarzation properties of oxygen reduciton and its dependence on MnO2 discharge state, in combination with the characterization of discharge intermediate and the kinetic parameters of the oxygen reduction. Based on the experimental observation and mechanistic analysis, it was suggested that the reduction of oxygen was closely related to the discharge behaviors of MnO2. When MnO2 was electrochimically reduced to MnOOH, it was immediately oxidized by oxygen molecules. Thus the oxygen reduction proceeds through continuous oxidation of the discharge product of MnO2 and the MnO2 catalyst behaves like an eletron mediator to provide rapidly the reduction reagent via its discharge. The I-E relationship derived from this mechanism can very well explain the observed polarization properties of oxygen reduction on MnO2 electrode.
Keywords
Oxygen reduction, Electrocatalysis, Manganese dioxide, Reaction mechanism
Publication Date
2003-08-28
Online Available Date
2003-08-28
Revised Date
2002-12-24
Received Date
2002-11-04
Recommended Citation
Yu-liang CAO, Han-xi YANG, Xin-ping AI, Li-fen XIAO.
The Mechanism of Electrocatalytic Reduction of Oxygen on Manganese Dioxide[J]. Journal of Electrochemistry,
2003
,
9(3): 336-343.
DOI: 10.61558/2993-074X.3318
Available at:
https://jelectrochem.xmu.edu.cn/journal/vol9/iss3/17
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