Electrooxidation of formic acid on gold: An ATR-SEIRAS study of the role of adsorbed formate

Formate was found to be the only adsorbed species detected with time-resolved ATR-SEIRAS during the electrooxidation of formic acid on Au in acidic media. No adsorbed CO was detected, since even in CO-saturated acidic solutions the adsorption of CO on gold is negligible. The onset of formic acid electrooxidation coincides with that of formate electroadsorption, pointing to bridge-bonded adsorbed formate as the reaction intermediate. Furthermore, at constant potential the current increases quadratically with the formate coverage, which indicates that the rate-determining step in the oxidation of adsorbed formate to CO2 is a bimolecular reaction between adjacent formate species. The rate of this reaction was unaffected by potential changes, which unequivocally confirms its chemical character. (C) 2012 Elsevier B.V. All rights reserved.     «

Formate was found to be the only adsorbed species detected with time-resolved ATR-SEIRAS during the electrooxidation of formic acid on Au in acidic media. No adsorbed CO was detected, since even in CO-saturated acidic solutions the adsorption of CO on gold is negligible. The onset of formic acid electrooxidation coincides with that of formate electroadsorption, pointing to bridge-bonded adsorbed formate as the reaction intermediate. Furthermore, at constant potential the current increases quadra...     »

ISI Document Delivery No.: 048UX Times Cited: 1 Cited Reference Count: 43 Cuesta, Angel Cabello, Gema Hartl, Fabian W. Escudero-Escribano, Maria Vaz-Dominguez, Cristina Kibler, Ludwig A. Osawa, Masatoshi Gutierrez, Claudio Osawa, Masatoshi/A-5294-2012; Escudero-Escribano, Maria/D-1408-2011; Cuesta, Angel/C-7151-2008 Cuesta, Angel/0000-0003-4243-1848 DGI (Spanish Ministry of Education and Science) [CTQ2009-07017, PLE2009-0008]; Spanish Ministry of Science and Innovation; Madrid City Council; CSIC Funding from the DGI (Spanish Ministry of Education and Science) through Projects CTQ2009-07017 and PLE2009-0008 is gratefully acknowledged. M. E.-E. acknowledges an FPI fellowship from the Spanish Ministry of Science and Innovation and an accommodation grant at the Residencia de Estudiantes from the Madrid City Council. C.V.-D. acknowledges a JAE-Doc fellowship from CSIC. 1 Elsevier science bv Amsterdam     «

ISI Document Delivery No.: 048UX Times Cited: 1 Cited Reference Count: 43 Cuesta, Angel Cabello, Gema Hartl, Fabian W. Escudero-Escribano, Maria Vaz-Dominguez, Cristina Kibler, Ludwig A. Osawa, Masatoshi Gutierrez, Claudio Osawa, Masatoshi/A-5294-2012; Escudero-Escribano, Maria/D-1408-2011; Cuesta, Angel/C-7151-2008 Cuesta, Angel/0000-0003-4243-1848 DGI (Spanish Ministry of Education and Science) [CTQ2009-07017, PLE2009-0008]; Spanish Ministry of Science and Innovation; Madrid City Council;...     »