Effect of Pt-Ru alloy composition on high-temperature methanol electro-oxidation

被引：157
作者：
Aricò, AS
Antonucci, PL
Modica, E
Baglio, V
Kim, H
Antonucci, V
机构：
[1] Inst CNR TAE, I-98126 Messina, Italy
[2] Univ Reggio Calabria, Dept Mech & Mat, I-89100 Reggio Di Calabria, Italy
[3] Seoul Natl Univ, Dept Chem, Seoul 151742, South Korea
[4] Seoul Natl Univ, Ctr Mol Catalysis, Seoul 151742, South Korea
来源：
ELECTROCHIMICA ACTA | 2002年 / 47卷 / 22-23期
关键词：
Pt-Ru catalysts; X-ray diffraction; X-ray photoelectron spectroscopy; methanol electro-oxidation; fuel cells;
D O I：
10.1016/S0013-4686(02)00342-0
中图分类号：
O646 [电化学、电解、磁化学];
学科分类号：
081704 ;
摘要：
The structure, chemistry and morphology of unsupported Pt-Ru electro-catalysts of various compositions were investigated by X-ray diffraction (XRD), energy-dispersive analysis by X-rays and X-ray photoelectron spectroscopy. The metal surface-area of PtRu catalysts prepared in an identical manner increased significantly with the increase in Ru content. The electro-catalytic activity of the catalysts towards methanol oxidation in direct methanol fuel cells (DMFC) was studied at 130 degreesC. A volcano-shape curve was obtained as a function of alloy composition for both mass and specific activities with a maximum occurring for the Pt:Ru (1:1) electro-catalyst. At low anodic overpotentials, an increase in both mass and specific activities as a function of bulk composition was found up to 50 at.% Ru, corresponding to about 40% Ru on the surface. These results indicate that the bifunctional mechanism governs the methanol electro-oxidation on Pt-Ru in the high temperature range, similarly to conventional DMFC operation (60-90 degreesC). (C) 2002 Elsevier Science Ltd. All rights reserved.
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收藏
页码：3723 / 3732
页数：10
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