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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

Vol. 16    No. 1    February 2006

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Electro-catalytic effect of manganese oxide on oxygen reduction at teflonbonded carbon electrode
ZHOU De-bi(周德璧), LÜ Xin-kun(吕新坤), LIU Dan-ping(刘丹平)

School of Chemistry and Chemical Engineering, Central South University, Changsha 410083, China

Abstract: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)×10P-7P A/cmP2P. In the presence of manganese oxide on carbon electrode, the couple MnP3+P/MnP4+P reacts with the OB2B adsorbed on carbon sites forming radicals and acceletes the dismutation of , which contributes to the catalytic effect of manganese oxide for OR reaction.

 

Key words: oxygen reduction; manganese oxide; gas diffusion electrode; AC impedance

ISSN 1672-7029
CN 43-1423/U

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