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

Angel Cuesta, Gema Cabello, Fabian W. Hartl, Maria Escudero-Escribano, Cristina Vaz-Dominguez, Ludwig A. Kibler, Masatoshi Osawa, Claudio Gutierrez

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Abstract

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.
Original languageEnglish
Pages (from-to)79-86
Number of pages8
JournalCatalysis Today
Volume202
Early online date21 Jun 2012
DOIs
Publication statusPublished - 15 Mar 2013

Keywords

  • Au
  • formic acid
  • ATR-SEIRAS
  • electroxidation
  • direct path
  • absorbed formate

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    Cuesta, A., Cabello, G., Hartl, F. W., Escudero-Escribano, M., Vaz-Dominguez, C., Kibler, L. A., Osawa, M., & Gutierrez, C. (2013). Electrooxidation of formic acid on gold: An ATR-SEIRAS study of the role of adsorbed formate. Catalysis Today, 202, 79-86. https://doi.org/10.1016/j.cattod.2012.04.022