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题名: Ethanol electrooxidation on novel carbon supported Pt/SnOx/C catalysts with varied Pt : Sn ratio
作者: Jiang, L.;  Colmenares, L.;  Jusys, Z.;  Sun, G. Q.;  Behm, R. J.
关键词: ethanol oxidation ;  activity ;  selectivity ;  supported catalyst ;  Pt/SnO2
刊名: ELECTROCHIMICA ACTA
发表日期: 2007-12-01
DOI: 10.1016/j.electacta.2007.01.047
卷: 53, 期:2, 页:377-389
收录类别: SCI ;  ISTP
文章类型: Article
WOS标题词: Science & Technology ;  Physical Sciences
类目[WOS]: Electrochemistry
研究领域[WOS]: Electrochemistry
英文摘要: Novel carbon supported Pt/SnOx/C catalysts with Pt:Sn atomic ratios of 5:5, 6:4, 7:3 and 8:2 were prepared by a modified polyol method and characterized with respect to their structural properties (X-ray diffraction (XRD) and transmission electron microscopy (TEM)), chemical composition (XPS), their electrochemical properties (base voltammetry, COad stripping) and their electrocatalytic activity and selectivity for ethanol oxidation (ethanol oxidation reaction (EOR)). The data show that the Pt/SnOx/C catalysts are composed of Pt and tin oxide Danoparticles with an average Pt particle diameter of about 2 nm. The steady-state activity of the Pt/SnOx/C catalysts towards the EOR decreases with tin content at room temperature, but increases at 80 degrees C. On all Pt/SnOx/C catalysts, acetic acid and acetaldehyde represent dominant products, CO2 formation contributes 1-3% for both potentiostatic and potentiodynamic reaction conditions. With in creasing potential, the acetaldehyde yield decreases and the acetic acid yield increases. The apparent activation energies of the EOR increase with tin content (19-29 kJ mol(-1)), but are lower than on Pt/C (32 kJ mol(-1)). The somewhat better performance of the Pt/SnOx/C catalysts compared to alloyed PtSnx/C catalysts is attributed to the presence of both sufficiently large Pt ensembles for ethanol dehydrogenation and C-C bond splitting and of tin oxide for OH generation. Fuel cell measurements performed for comparison largely confirm the results obtained in model studies. (c) 2007 Elsevier Ltd. All rights reserved.
关键词[WOS]: ELECTROCHEMICAL MASS-SPECTROMETRY ;  FUEL-CELL CATALYST ;  ANODE CATALYSTS ;  PRODUCT YIELDS ;  PART I ;  OXIDATION ;  ELECTROCATALYSTS ;  METHANOL ;  ELECTRODE ;  ACID
语种: 英语
WOS记录号: WOS:000251480900018
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/140488
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.Univ Ulm, Inst Catalysis & Surface Chem, D-89069 Ulm, Germany
2.Chinese Acad Sci, Dalian Inst Chem Phys, Dalian 116023, Peoples R China

Recommended Citation:
Jiang, L.,Colmenares, L.,Jusys, Z.,et al. Ethanol electrooxidation on novel carbon supported Pt/SnOx/C catalysts with varied Pt : Sn ratio[J]. ELECTROCHIMICA ACTA,2007,53(2):377-389.
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