Electro-catalytic effect of manganese oxide on oxygen reduction at teflonbonded carbon electrode

Oxygen reduction（OR）on Teflon-bonded carbon electrodes with manganese oxide as catalyst in 6 mol/L KOH solution was investigated using AC impedance spectroscopy combined with other techniques. For OR at this electrode, the Tafel slope is -0.084 V/dec and the apparent exchange current density is （1.0...

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Bibliographic Details
Published in:Transactions of Nonferrous Metals Society of China 2006-02, Vol.16 (1), p.217-222
Main Author: 周德璧 吕新坤 刘丹平
Format: Article
Language:English
Subjects:
AC impedance
gas diffusion electrode
manganese oxide
oxygen reduction
气体扩散电极
氧化锰
氧气调节
电镀-催化效应
直流阻抗
碳电极
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Summary:Oxygen reduction（OR）on Teflon-bonded carbon electrodes with manganese oxide as catalyst in 6 mol/L KOH solution was investigated using AC impedance spectroscopy combined with other techniques. For OR at this electrode, the Tafel slope is -0.084 V/dec and the apparent exchange current density is （1.02-3.0）×10^-7 A/cm^2. In the presence of manganese oxide on carbon electrode, the couple Mn^3＋/Mn^4＋ reacts with the O2 adsorbed on carbon sites forming O2 radicals and acceletes the dismutation of O2^-, which contributes to the catalytic effect of manganese oxide for OR reaction.
ISSN:1003-6326
DOI:10.1016/S1003-6326(06)60038-1