Ethanol electrooxidation on Pt-Sn and Pt-Sn-W bulk alloys

Journal of the Brazilian Chemical Society

Hahn, F.¹  Anjos, D. M. dos¹  Kokoh, K. B.¹  Tremiliosi-Filho, G.¹  Léger, J. -M.¹  Universidade de São Paulo, São Carlos, Brazil¹  Université de Poitiers, Poitiers, France¹ 

关键词: ethanol oxidation;    direct ethanol fuel cell;    platinum-tin;    platinum-tin-tungsten;    in situ Infrared Reflectance Spectroscopy;   

DOI  :  10.1590/S0103-50532008000400026

学科分类：化学（综合）

来源: SciELO

【 摘 要 】

Ethanol oxidation has been studied on Pt-Sn and Pt-Sn-W electrodes prepared in an arc-melting furnace. Different electrochemical techniques like cyclic voltammetry and chronoamperometry were used to evaluate the catalytic activity of these materials. The electro-oxidation process was also investigated by in situ infrared reflectance spectroscopy in order to determine adsorbed intermediates and reaction products. Experimental results indicated that Pt-Sn and Pt-Sn-W alloys are able to oxidize ethanol mainly to acetaldehyde and acetic acid. Adsorbed CO was also detected, demonstrating the viability of splitting the C-C bond in the ethanol molecule during the oxidation process. The adsorbed CO was further oxidized to CO2.This reaction product was clearly detected by SNIFTIRS. Pt-Sn-W catalyst showed a better electrochemical performance than Pt-Sn that, in it turn, is better than Pt-alone.

【 授权许可】

Unknown