摘要
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.
A composite catalyst Nafion-Pt-HxMoO3 was prepared on a glassy carbon by cyclic voltammetry methods in sulfuric acid solution containing Na2MoO4, H2PtCl6 and Naton, 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 Nation. The activity of Pt-HxMoO3 reaches its maximum when the content of Nation in the preparation solution is 0.012%(mass fraction). In this case the oxidation peak current of methanol on Nation-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 U2SO4 solution. The results from energy dispersive spectroscopy show that the content of Nation 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.
出处
《中国有色金属学会会刊:英文版》
CSCD
2007年第A02期1122-1125,共4页
Transactions of Nonferrous Metals Society of China
基金
Project(20573039) supported by the National Natural Science Foundation of China
project(2005DFA60580) supported by CISTC
project (2005B50101003) supported by Key Project of Guangdong Province
关键词
复合催化剂
制备方法
电沉积法
铂
氢
钼
铜
甲醇氧化
platinum-hydrogen molybdenum bronze
Nafion
electrodeposition preparation
methanol oxidation