| Texto completo | |
| Autor(es): |
da Silva, G. C.
;
Santos, N. A.
;
Perez, J.
;
Shao, M
;
Brisard, G
Número total de Autores: 5
|
| Tipo de documento: | Artigo Científico |
| Fonte: | ELECTROCATALYSIS 8; v. 72, n. 29, p. 12-pg., 2016-01-01. |
| Resumo | |
Pt-Y/C catalysts were prepared by a modified formic acid method and their activities for oxygen reduction reaction (ORR) were evaluated. X-ray diffraction analysis showed that no alloy was formed between the metals, while x-ray photoelectron spectroscopy revealed that yttrium is present as Y2O3, Y(OH)(3), and Y-O-Pt. The Pt-Y/C 7:3 material had the highest specific activity (94 mu A cm(Pt)(-2)) for ORR, and was superior to other PtY/C materials. Following repetitive potential cycling, ORR activity of the Pt-Y/C 7:3 catalyst decreased in a similar proportion to that of Pt/C. X-ray photoelectron spectroscopy results of the aged ultrathin catalyst layer were in agreement with energy-dispersive x-ray spectroscopy data. These studies revealed that the intensities of the Y 3d peaks were suppressed due to voltammetric cycling and that while Y2O3 and Y(OH)(3) dissolved, Y-O-Pt remained in the catalyst. (AU) | |
| Processo FAPESP: | 11/50727-9 - Desenvolvimento de sistemas para produção de hidrogênio e para geração e utilização de energia eletro-química |
| Beneficiário: | Ernesto Rafael Gonzalez |
| Modalidade de apoio: | Auxílio à Pesquisa - Temático |
| Processo FAPESP: | 13/17549-5 - Estudo das variações das propriedades físico-químicas de catalisadores Pt-Nd/C e Pt-Nd-Sn/C para a eletro-oxidação de etanol. |
| Beneficiário: | Nathalia Abe Santos |
| Modalidade de apoio: | Bolsas no Brasil - Doutorado |