Combinatorial screening of thin film electrocatalysts for a direct methanol fuel cell anode

被引：79

作者：

Cooper, James S. ^{[1
]}

McGinn, Paul J. ^{[1
]}

机构：

[1] Univ Notre Dame, Ctr Molecularly Engn Mat, Dept Chem & Biomol Engn, Notre Dame, IN 46556 USA

来源：

JOURNAL OF POWER SOURCES | 2006年 / 163卷 / 01期

关键词：

direct methanol fuel cell (DMFC); electrocatalysis; methanol oxidation reaction; cyclic voltammetry; multichannel microarray; Pt-Ru-W-Co; ROTATING-DISK ELECTRODE; PT-RU; OXIDATION CATALYSTS; CO ELECTROOXIDATION; AD-ATOMS; PLATINUM; TERNARY; ALLOYS; AREA; NANOPARTICLES;

D O I：

10.1016/j.jpowsour.2006.09.028

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 Pt-Ru-W and Pt-Ru-Co ternary alloy systems were investigated for use as anode catalysts in direct methanol fuel cells. Plasma sputtering through shadow masks was used to deposit discrete composition combinatorial libraries. Post-deposition annealing promoted multilayer homogenization, with interdiffusion of the layers confirmed by X-ray diffraction. The short term methanol oxidation activities of the different compositions were compared in parallel by cyclic voltammetry with a multichannel electrochemical cell. It was found that the optimum composition changed from initial to final tests. Initially Pt25Ru0W75 and Pt17Ru17Co66 outperformed the best binary Pt-Ru catalyst by 3 x and 20 x, respectively. Cycling the potential at 60 degrees C was found to change the performance of some compositions. The performance of Pt-Ru binary catalysts were improved by this conditioning and the optimum ternary compositions shifted to Pt44Ru12W44 and Pt12Ru50Co38. The optimum Pt-Ru-W composition had a peak methanol oxidation current density that was 1.5 x more than the best Pt-Ru binary composition. The peak methanol oxidation current density of the best Pt-Ru-Co composition was 2.5 x more than the best Pt/Ru binary composition and had a substantially lower onset potential. (c) 2006 Elsevier B.V. All rights reserved.

引用

页码：330 / 338

页数：9

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