Oxygen reduction on a Pt70Ni30/C electrocatalyst prepared by the borohydride method in H2SO4/CH3OH solutions

被引：42

作者：

Antolini, E ^{[1
]}

Salgado, JRC ^{[1
]}

Gonzalez, ER ^{[1
]}

机构：

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

来源：

JOURNAL OF POWER SOURCES | 2006年 / 155卷 / 02期

基金：

巴西圣保罗研究基金会;

关键词：

Pt70Ni30/C alloy; oxygen reduction; direct methanol fuel cells;

D O I：

10.1016/j.jpowsour.2005.05.009

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：

The activity for the oxygen reduction reaction (ORR) on carbon supported Pt-Ni electrocatalysts prepared by reduction of Pt and Ni precursors with NaHB4 was investigated in sulphuric acid both in the absence and in the presence of methanol and compared with that of a commercial Pt/C electrocatalyst. In methanol-free sulphuric acid solution the Pt7.0Ni30/C alloy electrocatalyst showed a lower specific activity towards oxygen reduction compared to Pt/C. In O-2-free H2SO4 the onset potential for methanol oxidation on Pt70Ni30/C was shifted to more positive potentials, which indicates a lower activity for methanol oxidation than platinum. In the methanol containing electrolyte the higher methanol tolerance of the Pt70Ni30/C electrocatalyst for the ORR was ascribed to the lower activity of the binary electrocatalyst for methanol oxidation, arising from a composition effect. (c) 2005 Elsevier B.V. All rights reserved.

引用

页码：161 / 166

页数：6

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