Journal of the Brazilian Chemical Society | |
PtSnIr/C anode electrocatalysts: promoting effect in direct ethanol fuel cells | |
Júlio C. M. Silva2  Rodrigo F. B. De Souza2  Mayara A. Romano2  Melina D'villa-silva2  Marcelo L. Calegaro1  Peter Hammer1  Almir O. Neto1  Mauro C. Santos2  | |
[1] ,Universidade Federal do ABC Centro de Ciências Naturais e Humanas Laboratório de Eletroquímica e Materiais NanoestruturadosSanto André SP ,Brazil | |
关键词: PtSnIr; ethanol oxidation reaction; electrocatalysis; nanostructured materials; fuel cells; | |
DOI : 10.1590/S0103-50532012000600021 | |
来源: SciELO | |
【 摘 要 】
This study investigates the promoting effect of PtSnIr/C (1:1:1) electrocatalyst anode, prepared by polymeric precursor method, on the ethanol oxidation reaction in a direct ethanol fuel cell (DEFC). All of the materials used were 20% metal m/m on carbon. X-ray photoelectron spectroscopy (XPS) analysis showed the presence of Pt, PtOH2, PtO2, SnO2 and IrO2 at the electrocatalyst surface, indicating a possible decorated particle structure. X-ray diffractometry (XRD) analysis indicated metallic Pt and Ir as well as the formation of an alloy with Sn. Using the PtSnIr/C electrocatalyst prepared here with two times lower loading of Pt than PtSn/C E-tek electrocatalyst, it was possible to obtain the same maximum power density found for the commercial material. The main reaction product was acetic acid probably due to the presence of oxides, in this point the bifunctional mechanism is predominant, but an electronic effect should not be discarded.
【 授权许可】
CC BY
All the contents of this journal, except where otherwise noted, is licensed under a Creative Commons Attribution License
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