催化作用
电化学
循环伏安法
无机化学
化学
水溶液
锰
Nafion公司
过氧化氢
氧化还原
分解
选择性催化还原
电极
伏安法
有机化学
物理化学
作者
Lanqun Mao,Tadashi Sotomura,Kenichi Nakatsu,Nobuharu Koshiba,Dun Zhang,Takeo Ohsaka
出处
期刊:Journal of The Electrochemical Society
[The Electrochemical Society]
日期:2002-01-01
卷期号:149 (4): A504-A504
被引量:145
摘要
The catalytic function and activity of manganese oxides (MnOx: and MnOOH) to the electrochemical reduction of in 0.10 M KOH aqueous solution have been investigated by cyclic voltammetry at MnOx/Nafion-modified gold electrodes. Two successive reduction current peaks were observed at Nafion-modified electrodes in the cyclic voltammograms, for a two-electron reduction of to hydrogen peroxide and for a two-electron reduction of to The peak current heights of and changed greatly depending on the kind of MnOx species incorporated into the MnOx/Nafion-modified gold electrodes; increased and decreased. On the assumption that produced in the first reduction step is chemically decomposed into and with a catalytic action of MnOx and that this regenerated is reduced again in the same first reduction step, we evaluated the catalytic activity of MnOx using the values of and MnOOH provided the highest catalytic activity to the electrochemical reduction of This result was supported by another experiment by using a chemical method where catalytic decomposition of with MnOx was estimated by measuring the concentration directly with a commercial oxygen sensor. © 2002 The Electrochemical Society. All rights reserved.
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