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题名: Thickness effects of a carbon-supported platinum catalyst layer on the electrochemical reduction of oxygen in sulfuric acid solution
作者: Jiang, JH;  Yi, BL
关键词: oxygen reduction ;  catalyst layer thickness ;  fuel cell ;  film electrode ;  spillover
刊名: JOURNAL OF ELECTROANALYTICAL CHEMISTRY
发表日期: 2005-03-15
DOI: 10.1016/j.jelechem.2004.11.022
卷: 577, 期:1, 页:107-115
收录类别: SCI
文章类型: Article
WOS标题词: Science & Technology ;  Physical Sciences
类目[WOS]: Chemistry, Analytical ;  Electrochemistry
研究领域[WOS]: Chemistry ;  Electrochemistry
英文摘要: The influence of the thickness of a carbon-supported platinum catalyst layer on the oxygen reduction reaction (orr) has been studied in sulfuric acid solution by means of a thin-film rotating disk electrode. Pronounced changes in the Pt utilization, electrode activity and the orr kinetics have been observed upon varying the catalyst layer thickness. The thicker film electrode exhibits a higher Pt utilization efficiency and higher activity, and promotes the orr kinetics at potentials relevant to fuel cell operations. The participation of Pt surfaces not in contact with the electrolyte solution in electrochemical reactions via the spillover of adsorbed hydrogen and oxygen species, is proposed to be responsible for the changes. The thicker catalyst layer is likely to modify the Pt particle-particle distance by providing shared Pt sites between adjacent carbon supports, to improve the surface density of active catalyst particles per single carbon support by sharing adjacent catalyst sites, and to increase the ratio of the particle surfaces free of blocking anions to the catalyst/electrolyte interface surfaces. The carbon-supported platinum catalyst layer becomes active at 0.90 V vs RHE only when the catalyst layer is thicker than I pm. To provide reasonable activity, the minimum catalyst layer thickness should be around 2-4 mu m. These results should be considered in the design of the cathode catalyst layer of polymer electrolyte membrane fuel cells. (c) 2004 Elsevier B.V. All rights reserved.
关键词[WOS]: THIN-FILM ;  HYDROGEN SPILLOVER ;  SURFACE-DIFFUSION ;  DISK ELECTRODE ;  KINETICS ;  ADSORPTION ;  AREA ;  MICROELECTRODES ;  INTERFACE ;  MEMBRANES
语种: 英语
WOS记录号: WOS:000227735800014
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/139899
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.Chinese Acad Sci, Dalian Inst Chem Phys, Fuel Cell R&D Ctr, Dalian 116023, Peoples R China
2.NuVant Syst Inc, Chicago, IL 60616 USA

Recommended Citation:
Jiang, JH,Yi, BL. Thickness effects of a carbon-supported platinum catalyst layer on the electrochemical reduction of oxygen in sulfuric acid solution[J]. JOURNAL OF ELECTROANALYTICAL CHEMISTRY,2005,577(1):107-115.
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