Electrooxidation of ethanol on Pt and PtRu surfaces investigated by ATR surface-enhanced infrared absorption spectroscopy

Journal of the Brazilian Chemical Society

Boscheto, Emerson¹  Silva, Márcio F.¹  Batista, Bruno C.¹  Universidade de São Paulo, São Carlos, Brazil¹  Varela, Hamilton¹  Universidade Federal do Mato Grosso do Sul, Campo Grande, Brazil¹  Camara, Giuseppe A.¹  Ertl Center for Electrochemistry and Catalysis, Gwangju, South Korea¹ 

关键词: ethanol electrooxidation;    adsorbed CO;    platinum;    ruthenium;    ATR-SEIRAS;   

DOI  :  10.1590/S0103-50532012000500007

学科分类：化学（综合）

来源: SciELO

【 摘 要 】

Herein, it was investigated for the first time the electro-oxidation of ethanol on Pt and PtRu electrodeposits in acidic media by using in situ surface enhanced infrared absorption spectroscopy with attenuated total reflection (ATR-SEIRAS). The experimental setup circumvents the weak absorbance signals related to adsorbed species, usually observed for rough, electrodeposited surfaces, and allows a full description of the CO coverage with the potential for both catalysts. The dynamics of adsorption-oxidation of CO was accessed by ATR-SEIRAS experiments (involving four ethanol concentrations) and correlated with expressions derived from a simple kinetic model. Kinetic analysis suggests that the growing of the CO adsorbed layer is nor influenced by the presence of Ru neither by the concentration of ethanol. The results suggest that the C-C scission is not related to the presence of Ru and probably happens at Pt sites.

【 授权许可】

Unknown