Synthesis and characterization of PtRu/C catalysts obtained by colloidal and deposition methods for fuel cell applications

Materials Research

Egberto Gomes Franco²  Almir Oliveira-neto²  Estevam Vitório Spinacé²  Marcelo Linardi²  Nathalie Martz¹  Marian Mazurek¹  Hartmut Fuess¹ 

[1] ,CNEN Instituto de Pesquisas Energéticas e NuclearesSP ,Brazil

关键词: fuel cell;    catalyst;    methanol;    electrocatalyst;    nanocrystal;   

DOI  :  10.1590/S1516-14392005000200003

来源: SciELO

【 摘 要 】

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.

【 授权许可】

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