Acta Phys. -Chim. Sin. ›› 2000, Vol. 16 ›› Issue (11): 1013-1021.doi: 10.3866/PKU.WHXB20001110

• ARTICLE • Previous Articles     Next Articles

Kinetic Model of Ethanol Oxidation on Ni-Mo Alloy Electrode

Zeng Yue, Yu Shang-Ci, Li Ze-Lin, Chen Ke, Zhou Shao-Min   

  1. Department of Chemistry,Hunan Normal University,Changsha,Hunan 410006|State Key Laboratory for Physical Chemistry of the Solid Surface,Department of Chemistry,Xiamen University,Xiamen 361005
  • Received:2000-02-16 Revised:2000-06-07 Published:2000-11-15
  • Contact: Zeng Yue

Abstract:

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.

Key words: Ni-Mo alloy, Ethanol oxidation, Kinetics, Mathematical model