Ethanol oxidation on a high temperature PBI-based DEFC using Pt/C, PtRu/C and Pt3Sn/C as catalysts
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- 作者：José J. Linares (1) (2)
Sabrina C. Zignani (1)
Thairo A. Rocha (1)
Ernesto R. Gonzalez (1) - 关键词：PEMFC ; Ethanol ; Oxidation products ; High temperature ; Polybenzimidazole ; Catalysts
- 刊名：Journal of Applied Electrochemistry
- 出版年：2013
- 出版时间：February 2013
- 年：2013
- 卷：43
- 期：2
- 页码：147-158
- 全文大小：785KB
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Sabrina C. Zignani (1)
Thairo A. Rocha (1)
Ernesto R. Gonzalez (1)
1. Instituto de Química de S?oCarlos, USP, Av. Trabalhador S?o Carlense, 400, CP 780, S?o Carlos, SP, CEP 13560-970, Brazil
2. Instituto de Química, Universidade de Brasília, Campus Darcy Ribeiro CP 04478, Brasília, DF, CEP 70910-000, Brazil - ISSN：1572-8838
文摘
A high temperature ethanol-fed polymer electrolyte membrane fuel cell has been implemented by using H3PO4-doped m-polybenzimidazole as polymeric electrolyte. Commercial Pt/C, PtRu/C and Pt3Sn/C catalysts are used in the anode. The performance was assessed in terms of polarization curves at different temperatures, feeding the cell with a high concentration ethanol solution (water/ethanol mass ratio of 2). The product distribution was measured with the support of a gas chromatograph. The use of bimetallic catalysts increased the current density. PtRu/C showed the best performance up to 175?°C, but it is outperformed by Pt3Sn/C at 200?°C. In terms of oxidation products, higher temperatures and current densities favour the oxidation of ethanol. However, Pt3Sn/C promoted the generation of more oxidized products compared to PtRu/C (in which most of the ethanol is oxidized to acetaldehyde), especially at high temperature. This accounts for the large current density. In terms of complete oxidation of ethanol to CO2, Pt/C was by far the most efficient catalyst for C–C scission, achieving percentages of 56?% of CO2, although operating above 175?°C dramatically boosted an undesirable methanation process that slashed the efficiency. The combination of fuel cell results and product distribution helped to suggest the different oxidation routes on the surface of the different catalysts.