Autocatalysis in the open circuit interaction of alcohol molecules with oxidized Pt surfaces

Autor(es)

Batista, Bruno C. ^[1] ; Sitta, Elton ^[1] ; Eiswirth, Markus ^[2] ; Varela, Hamilton ^[1]

Afiliação do(s) autor(es)

^[1] Univ Sao Paulo, Inst Quim Sao Carlos, BR-13560970 Sao Carlos, SP - Brazil

^[2] Max Planck Gesell, Fritz Haber Inst, D-14195 Berlin - Germany

• Tipo de documento: Artigo Científico
• Fonte: Physical Chemistry Chemical Physics; v. 10, n. 44, p. 6686-6692, 2008.
• Citações Web of Science: 16

Resumo

We studied the open circuit interaction of methanol and ethanol with oxidized platinum electrodes using in situ infrared spectroscopy. For methanol, it was found that formic acid is the main species formed in the initial region of the transient and that the steep decrease of the open circuit potential coincides with an explosive increase in the CO(2) production, which is followed by an increase in the coverage of adsorbed CO. For ethanol, acetaldehyde was the main product detected and only traces of dissolved CO(2) and adsorbed CO were found after the steep potential decay. In both cases, the transients were interpreted in terms of (a) the emergence of sub-surface oxygen in the beginning of the transient, where the oxide content is high, and (b) the autocatalytic production of free platinum sites for lower oxide content during the steep decay of the open circuit potential. (AU)

• Processo FAPESP: 04/04528-0 - Auto-organização dinâmica na interface sólido-líquido
• Beneficiário: Hamilton Brandão Varela de Albuquerque
• Modalidade de apoio: Auxílio à Pesquisa - Jovens Pesquisadores
• Processo FAPESP: 06/01088-5 - Eletrooxidação de etileno-glicol sobre níquel: cinética e instabilidades dinâmicas
• Beneficiário: Elton Fabiano Sitta
• Modalidade de apoio: Bolsas no Brasil - Mestrado
• Processo FAPESP: 07/01575-6 - Esletrocatálise utilizando líquidos iônicos
• Beneficiário: Bruno Carreira Batista
• Modalidade de apoio: Bolsas no Brasil - Mestrado