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铁道科学与工程学报

JOURNAL OF RAILWAY SCIENCE AND ENGINEERING

Vol. 17    Special 1    November 2007

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Electrodeposition preparation of Nafion-Pt-HxMoO3 and
its activity toward methanol oxidation
LI Wei(李  伟), HUANG Qing-dan(黄青丹), ZHANG Qing-long(张庆龙),
HUANG You-ju(黄幼菊), ZHAO Ling-zhi(赵灵智), LI Wei-shan(李伟善)

Department of Chemistry, South China Normal University, Guangzhou 510006, China

Abstract:A composite catalyst Nafion-Pt-HxMoO3 was prepared on a glassy carbon by cyclic voltammetry methods in sulfuric acid solution containing Na2MoO4, H2PtCl6 and Nafion, and its activity for the methanol oxidation was studied with Pt-HxMoO3 as comparison. It is found that the electrocatalytic activity and the stability of Pt-HxMoO3 are improved by the Nafion. The activity of Pt-HxMoO3 reaches its maximum when the content of Nafion in the preparation solution is 0.012%(mass fraction). In this case the oxidation peak current of methanol on Nafion-Pt-HxMoO3 is 1.76 times larger than that on Pt-HxMoO3 and keeps unchanged when the potential is set at 0.3 V (vs Hg-Hg2SO4) for 5 000 s in 1 mol/LCH3OH+0.5 mol/L H2SO4 solution. The results from energy dispersive spectroscopy show that the content of Nafion in the composite is 0.57%. The results from scanning electron spectroscopy show that the composite of Nafion-Pt-HxMoO has a gain size of about 90 nm and distributes more uniformly than Pt-HxMoO3.

 

Key words: platinum-hydrogen molybdenum bronze; Nafion; electrodeposition preparation; methanol oxidation

ISSN 1672-7029
CN 43-1423/U

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