Synthesis and characterization of Pt/Ru/C catalysts obtained by colloidal and deposition methods for fuel cell applications
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2005
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Materials Research
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The purpose of this investigation was to compare catalysts produced by the Bönnemann - colloidal method
(PtRu (B1) and PtRu (B2)), and those produced by the spontaneous deposition method (PtRu (SD)). The
catalysts produced by both methods had good electrochemical behavior for methanol oxidation for proton
exchange membrane fuel cell applications. The structure of the catalyst was examined by transmission
electron microscopy (TEM). Energy dispersive spectroscopic analysis (EDS) was used to determine the
semi-quantitative composition of the catalysts, and the electrochemical behavior was determined by cyclic
voltammetry (CV). The diffractograms of the binary catalysts revealed platinum and ruthenium as the only
crystalline phases, as per ICDD data base. The PtRu (B1) catalyst, treated in a reducing atmosphere, has
the same structure as PtRu (B2), treated in an oxidising/reducing atmosphere, except that the crystallite
size was around 1.7 nm for PtRu (B1) instead of 9.9 nm for PtRu (B2). The catalysts PtRu (B2) and
PtRu (SD) showed similar cyclic voltammetric behavior, which was better than that of PtRu (B1).
Both methods are suitable for the production of electrocatalysts for fuel cell applications. The colloidal method
is more expensive than the deposition method, but the former permits the production of ternary and quaternary
catalyst systems with enhanced CO tolerance.
Como referenciar
FRANCO, E.G.; OLIVEIRA NETO, A.; SPINACE, E.V.; LINARDI, M.; MARTZ, N.; MAZUREK, M.; FUESS, H. Synthesis and characterization of Pt/Ru/C catalysts obtained by colloidal and deposition methods for fuel cell applications. Materials Research, v. 8, n. 2, p. 117-120, 2005. DOI: 10.1590/S1516-14392005000200003. Disponível em: http://repositorio.ipen.br/handle/123456789/7638. Acesso em: 20 Feb 2025.
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