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

Author(s)

Silva, Marcio F. ^[1] ; Batista, Bruno C. ^[2] ; Boscheto, Emerson ^[2] ; Varela, Hamilton ^{[2, 3]} ; Camara, Giuseppe A. ^[1]

Affiliation

^[1] Univ Fed Mato Grosso do Sul, Dept Quim, BR-79070900 Campo Grande, MS - Brazil

^[2] Univ Sao Paulo, Inst Quim Sao Carlos, BR-13560970 Sao Carlos, SP - Brazil

^[3] GIST, Ertl Ctr Electrochem & Catalysis, Kwangju 500712 - South Korea

• Document type: Journal article
• Source: Journal of the Brazilian Chemical Society; v. 23, n. 5, p. 831-837, MAY 2012.
• Web of Science Citations: 7

Abstract

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. (AU)

• FAPESP's process: 09/07629-6 - Electrocatalysis IV: fundamental and applied aspects of electrocatalytic processes, bio-electrocatalysis and kinetic instabilities
• Grantee: Edson Antonio Ticianelli
• Support Opportunities: Program for Research on Bioenergy (BIOEN) - Thematic Grants