化学
电化学
无机化学
催化作用
电催化剂
电解质
小提琴手
氧化还原
反应速率常数
支撑电解质
氧气
析氧
溶剂
光化学
过氧化氢
电极
动力学
有机化学
物理化学
物理
量子力学
作者
Qianqi Lin,Qian Li,Christopher Batchelor‐McAuley,Richard G. Compton
出处
期刊:Journal of electrochemical science and technology
[The Korean Electrochemical Society - English Journal]
日期:2013-06-30
卷期号:4 (2): 71-80
被引量:2
标识
DOI:10.5229/jecst.2013.4.2.71
摘要
The study of methyl viologen (MV 2+ ) mediated oxygen reduction in electrolytic ethanol media possesses potential application in the electrochemical synthesis of hydrogen peroxide mainly due to the advantages of the much increased solubility of molecular oxygen (O 2 ) and high degree of reversibility of MV 2+/•+ redox couple.The diffusion coefficients of both MV 2+ and O 2 were investigated via electrochemical techniques.For the first time, MV 2+ mediated O 2 reduction in electrolytic ethanol solution has been proved to be feasible on both boron-doped diamond and micro-carbon disc electrodes.The electrocatalytic response is demonstrated to be due to the radical cation, MV •+ .The homogeneous electron transfer step is suggested to be the rate determining step with a rate constant of (1 ± 0.1) × 10 5 M -1 s -1 .With the aid of a simulation program describing the EC' mechanism, by increasing the concentration ratio of MV 2+ to O 2 electrochemical catalysis can be switched from a partial to a 'total catalysis' regime.
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