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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

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

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Author(s):
Pires, Felipe I. [1] ; Corradini, Patricia G. [1] ; Paganin, Valdecir A. [1] ; Antolini, Ermete [2] ; Perez, Joelma [1]
Total Authors: 5
Affiliation:
[1] Univ Sao Paulo, Inst Quim Sao Carlos, BR-13560970 Sao Carlos, SP - Brazil
[2] Scuola Sci Mat, I-16016 Genoa - Italy
Total Affiliations: 2
Document type: Journal article
Source: IONICS; v. 19, n. 7, p. 1037-1045, JUL 2013.
Web of Science Citations: 5
Abstract

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)

FAPESP's process: 10/20045-0 - Fuel cells: contributions to the development of catalysts and to the understanding of scaling up problems
Grantee:Joelma Perez
Support Opportunities: Regular Research Grants