摘要
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/cm2. In the presence of manganese oxide on carbon electrode, the couple Mn3+/Mn4+ reacts with the O2 adsorbed on carbon sites forming O ?2 radicals and acceletes the dismutation of O 2?, which contributes to the catalytic effect of manganese oxide for OR reaction.
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.
出处
《中国有色金属学会会刊：英文版》
CSCD
2006年第1期217-222,共6页
Transactions of Nonferrous Metals Society of China
基金
Project(1766-394201123) supported by the Natural Science Foundation of Hunan Province, China
