Effect of the degree of alloying of PtRu/C (1:1) catalysts on ethanol oxidation

Autor(es)

Pires, Felipe I. ^[1] ; Corradini, Patricia G. ^[1] ; Paganin, Valdecir A. ^[1] ; Antolini, Ermete ^[2] ; Perez, Joelma ^[1]

Afiliação do(s) autor(es)

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

^[2] Scuola Sci Mat, I-16016 Genoa - Italy

• Tipo de documento: Artigo Científico
• Fonte: IONICS; v. 19, n. 7, p. 1037-1045, JUL 2013.
• Citações Web of Science: 5

Resumo

The effect of alloying degree on the ethanol oxidation activity of a PtRu/C catalyst with a Pt/Ru atomic ratio of 1:1 was investigated by measurements in a half-cell and in a single direct ethanol fuel cell. The increase of the amount of Ru alloyed from one third to two thirds of the total Ru content in the catalyst clearly resulted in a decrease of the ethanol oxidation activity. As the amount of the highly active hydrous ruthenium oxide was near the same, the lower activity of the PtRu/C catalyst with higher alloying degree was mainly ascribed to the presence of an excessive number of Ru atoms around Pt active sites, hindering ethanol adsorption on Pt sites. The reduced ethanol adsorption could be also related to the decreased Pt-Pt bond distance and to the electronic effects by alloying. (AU)

• Processo FAPESP: 10/20045-0 - Células a combustível: contribuições ao desenvolvimento de catalisadores e ao entendimento dos problemas de aumento de escala
• Beneficiário: Joelma Perez
• Modalidade de apoio: Auxílio à Pesquisa - Regular