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题名: Structure and chemical composition of supported Pt-Sn electrocatalysts for ethanol oxidation
作者: Jiang, LH;  Sun, GQ;  Sun, SG;  Liu, JG;  Tang, SH;  Li, HQ;  Zhou, B;  Xin, Q
通讯作者: 辛勤
关键词: direct ethanol fuel cell ;  electrocatalyst ;  Pt-Sn ;  ethanol electro-oxidation
刊名: ELECTROCHIMICA ACTA
发表日期: 2005-09-20
DOI: 10.1016/j.electacta.2005.03.018
卷: 50, 期:27, 页:5384-5389
收录类别: SCI
文章类型: Article
部门归属: 3
项目归属: 305
产权排名: 1;1
WOS标题词: Science & Technology ;  Physical Sciences
类目[WOS]: Electrochemistry
研究领域[WOS]: Electrochemistry
英文摘要: Carbon supported PtSn alloy and PtSnOx particles with nominal Pt:Sn ratios of 3:1 were prepared by a modified polyol method. High resolution transmission electron microscopy (HRTEM) and X-ray microchemical analysis were used to characterize the composition, size, distribution, and morphology of PtSn particles. The particles are predominantly single nanocrystals with diameters in the order of 2.0-3.0 nm. According to the XRD results, the lattice constant of Pt in the PtSn alloy is dilated due to Sn atoms penetrating into the Pt crystalline lattice. While for PtSnOx nanoparticles, the lattice constant of Pt only changed a little. HRTEM micrograph of PtSnOx clearly shows that the change of the spacing of Pt (111) plane is neglectable, meanwhile, SnO2 nanoparticles, characterized with the nominal 0.264 nm spacing of SnO2 (10 1) plane, were found in the vicinity of Pt particles. In contrast, the HRTEM micrograph of PtSn alloy shows that the spacing of Pt (111) plane extends to 0.234 nm from the original 0.226 nm. High resolution energy dispersive X-ray spectroscopy (HR-EDS) analyses show that all investigated particles in the two PtSn catalysts represent uniform Pt/Sn compositions very close to the nominal one. Cyclic voltammograms (CV) in sulfuric acid show that the hydrogen ad/desorption was inhibited on the surface of PtSn alloy compared to that on the surface of the PtSnOx catalyst. PtSnOx catalyst showed higher catalytic activity for ethanol electro-oxidation than PtSn alloy from the results of chronoamperometry (CA) analysis and the performance of direct ethanol fuel cells (DEFCs). It is deduced that the unchanged lattice parameter of Pt in the PtSnOx catalyst is favorable to ethanol adsorption and meanwhile, tin oxide in the vicinity of Pt nanoparticles could offer oxygen species conveniently to remove the CO-like species of ethanolic residues to free Pt active sites. (C) 2005 Elsevier Ltd. All rights reserved.
关键词[WOS]: FUEL-CELL ;  ANODE CATALYSTS ;  PLATINUM-TIN ;  ELECTROOXIDATION ;  TEMPERATURE ;  METHANOL
语种: 英语
原文出处: 查看原文
WOS记录号: WOS:000232548100012
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/93003
Appears in Collections:中国科学院大连化学物理研究所_期刊论文

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作者单位: 1.Dalian Inst Chem Phys, Direct Alcohol Fuel Cell Grp, Dalian 116023, Peoples R China
2.Chinese Acad Sci, Grad Sch, Dalian Inst Chem Phys, State Key Lab Catalysis, Beijing 100864, Peoples R China

Recommended Citation:
Jiang, LH,Sun, GQ,Sun, SG,et al. Structure and chemical composition of supported Pt-Sn electrocatalysts for ethanol oxidation[J]. ELECTROCHIMICA ACTA,2005,50(27):5384-5389.
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