| Revista: | Materials research |
| Base de datos: | PERIÓDICA |
| Número de sistema: | 000312863 |
| ISSN: | 1516-1439 |
| Autores: | Franco, Egberto Gomes1 Oliveira-Neto, Almir Spinace, Estevam Vitorio Linardi, Marcelo Martz, Nathalie Mazurek, Marian Fuess, Hartmut |
| Instituciones: | 1Comissao Nacional de Energia Nuclear, Instituto de Pesquisas Energeticas e Nucleares, Sao Paulo. Brasil |
| Año: | 2005 |
| Periodo: | Abr-Jun |
| Volumen: | 8 |
| Número: | 2 |
| Paginación: | 117-120 |
| País: | Brasil |
| Idioma: | Inglés |
| Tipo de documento: | Nota breve o noticia |
| Enfoque: | Experimental |
| Resumen en inglés | 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 |
| Disciplinas: | Química, Ingeniería |
| Palabras clave: | Química industrial, Ingeniería de energéticos, Ingeniería de materiales, Ingeniería eléctrica, Celdas de combustible, Síntesis química, Nanocristales, Propiedades electroquímicas, Catalizadores |
| Keyword: | Chemistry, Engineering, Industrial chemistry, Electrical engineering, Energy engineering, Materials engineering, Fuel cells, Chemical synthesis, Nanocrystals, Electrochemical properties, Catalysts |
| Texto completo: | Texto completo (Ver HTML) |
