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Citation: Zeng Yue, Yu Shang-Ci, Li Ze-Lin, Chen Ke, Zhou Shao-Min. Kinetic Model of Ethanol Oxidation on Ni-Mo Alloy Electrode[J]. Acta Physico-Chimica Sinica, ;2000, 16(11): 1013-1021. doi: 10.3866/PKU.WHXB20001110 shu

Kinetic Model of Ethanol Oxidation on Ni-Mo Alloy Electrode

1.
Department of Chemistry,Hunan Normal University,Changsha,Hunan 410006

Received Date: 16 February 2000
Available Online: 15 November 2000

Ni-Mo alloy electrode, prepared by electrodeposition, were characterized for application to ethanol oxidation in 1 mol• L－ 1 KOH solution. Their electrochemical behavior was studied using cyclic voltammograms and quasi-steady-state current-potential curves. A mathematical model was developed to predict the behavior of ethanol oxidation on Ni-Mo alloy electrodes. The redox of Ni(OH)2/NiOOH couples in the alkaline solution is a preludial step for the ethanol electrooxidation, and the rate constants related to this reaction,k1 as well k－ 1,are functions of applied potential. Ethanol oxidation is carried out by a chemical reaction with rate constant kC1.The kinetic equations were derived and the kinetic parameters were obtained from a comparison of experimental results with kinetic equations. The rate constants of electrochemical reactions could be expressed as k1(E) =1.41× 107exp(0.5FE/RT)mmol• cm－ 2• s－ 1,k－ 1(E)=0.711 exp(0.5 FE/RT) mmol• cm－ 2• s－ 1,in which E was the applied potential vs SCE, and the chemical reaction rate constant, kC1,was 1.99× 10－ 4 cm• s－ 1.
- Ni-Mo alloy,
- Ethanol oxidation,
- Kinetics,
- Mathematical model
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