Electro-oxidation of ethanol on ternary non-alloyed Pt-Sn-Pr/C catalysts

被引：28

作者：

Corradini, Patricia G. ^{[1
]}

Antolini, Ermete ^{[2
]}

Perez, Joelma ^{[1
]}

机构：

[1] Univ Sao Paulo, Inst Quim Sao Carlos, BR-13560970 Sao Carlos, SP, Brazil

[2] Scuola Sci Mat, I-16016 Genoa, Italy

来源：

JOURNAL OF POWER SOURCES | 2015年 / 275卷

基金：

巴西圣保罗研究基金会;

关键词：

Fuel cells; Ethanol oxidation; Electrochemical characterization; Pt-Sn-Pr/C electro-catalystys; TEMPERATURE FUEL-CELLS; FORMIC-ACID; ELECTROCATALYSTS; OXIDATION; DURABILITY; REDUCTION; STABILITY;

D O I：

10.1016/j.jpowsour.2014.11.026

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

Ternary Pt-Sn-Pr/C (70:10:20), (70:15:15) and (45:45:10) electro-catalysts were prepared by a modified formic acid method, and their activity for the ethanol oxidation reaction (EOR) was compared with that of Pt-Pr/C catalysts prepared by the same methods and that of commercial Pt-Sn/C (75:25) and Pt/C catalysts. Among all the catalysts, the Pt-Sn-Pr/C (45:45:10) catalyst presented both the highest mass activity and the highest specific activity. The steady state electrochemical stability of ternary Pt-Sn-Pr catalysts increased with the surface Sn/Pt atomic ratio. Following repetitive potential cycling (RPC), the activity for ethanol oxidation of Pt-Sn-Pr/C catalysts with high surface Sn/Pt atomic ratio was considerably higher than that of the corresponding as-prepared catalysts, and increased with increasing the Sn/Pt ratio. The increase of the EOR mass activity following RPC was ascribed to the increase of either the specific activity (for the Pt-Sn-Pr/C (70:15:15) catalyst) or the electrochemically active surface area (for the Pt-Sn-Pr/C (45:45:10) catalyst). Dissolution of Sn and Pr oxides from Pt-Sn-Pr/C catalyst surface was observed following RPC. (C) 2014 Elsevier B.V. All rights reserved,

引用

页码：377 / 383

页数：7

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