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题名: Electro-oxidation of ethanol at gas diffusion electrodes a DEMS study
作者: Rao, V.;  Cremers, C.;  Stimming, U.;  Cao, Lei;  Sun, Shiguo;  Yan, Shiyou;  Sun, Gongquan;  Xin, Qin
刊名: JOURNAL OF THE ELECTROCHEMICAL SOCIETY
发表日期: 2007
DOI: 10.1149/1.2777108
卷: 154, 期:11, 页:B1138-B1147
收录类别: SCI
文章类型: Article
WOS标题词: Science & Technology ;  Physical Sciences ;  Technology
类目[WOS]: Electrochemistry ;  Materials Science, Coatings & Films
研究领域[WOS]: Electrochemistry ;  Materials Science
英文摘要: The ethanol electro-oxidation at gas diffusion electrodes made of different catalysts, Pt/C, PtRu(1:1)/C, and PtSn(7:3)/C, were studied by on-line differential electrochemical mass spectrometry in a wide temperature range (30-90 degrees C) as a function of the anode potential, the fuel concentration, and catalyst loading. The CO2 current efficiency (CCE) of the ethanol oxidation reaction (EOR) exhibits a maximum at about 0.6 V and decreases rapidly with further increasing potentials. The CCE for the EOR goes down with the increase in concentration of ethanol. CCE for ethanol oxidation reaction shows a strong increase with increasing catalyst loading. The CCE increases with increasing temperature, exceeding 75% at 90 degrees C, 0.1 M ethanol, and 5 mg/cm(2) Pt catalyst loading. PtSn/C shows high CCE, like Pt/C. But PtRu/C exhibits very small CCE. Of the intermediates, acetaldehyde is quite active for further oxidation. But acetic acid is fairly resistant against further oxidation. Our results indicate that the C-C bond scission observed for the EOR with CCE in excess of 50% has to proceed in parallel with ethanol oxidation to either acetaldehyde or acetic acid, and not sequentially from acetic acid further on, as acetic acid cannot be oxidized any further.
关键词[WOS]: FUEL-CELL ;  METHANOL OXIDATION ;  MASS-SPECTROMETRY ;  QUANTITATIVE DEMS ;  CATALYSTS ;  SURFACE ;  PTRU ;  SPECTROSCOPY ;  DAFC ;  ACID
语种: 英语
WOS记录号: WOS:000249787900021
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/140676
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.Tech Univ Munich, Dept Phys E19, D-85748 Garching, Germany
2.Bavarian Ctr Appl Energy Res ZAE Bayern, D-85748 Garching, Germany
3.Dalian Inst Chem Phys, Direct Alcohol Fuel Cell Grp, Dalian 116023, Peoples R China

Recommended Citation:
Rao, V.,Cremers, C.,Stimming, U.,et al. Electro-oxidation of ethanol at gas diffusion electrodes a DEMS study[J]. JOURNAL OF THE ELECTROCHEMICAL SOCIETY,2007,154(11):B1138-B1147.
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