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题名: Investigation of platinum utilization and morphology in catalyst layer of polymer electrolyte fuel cells
作者: Cheng, XL;  Yi, BL;  Han, M;  Zhang, JX;  Qiao, YG;  Yu, JR
关键词: PTFE ;  Nafion ;  PEMFC ;  platinum utilization ;  morphology
刊名: JOURNAL OF POWER SOURCES
发表日期: 1999-05-01
卷: 79, 期:1, 页:75-81
收录类别: SCI
文章类型: Article
WOS标题词: Science & Technology ;  Physical Sciences ;  Technology
类目[WOS]: Electrochemistry ;  Energy & Fuels
研究领域[WOS]: Electrochemistry ;  Energy & Fuels
英文摘要: Platinum utilization in the gas-diffusion catalyst layer and thin-film catalyst layer is investigated. The morphology of PTFE and Nafion in a simulated catalyst layer is examined by scanning electronmicroscopy (SEM) and transmission electron microscopy (TEM). The results show that the platinum utilization of the thin-film catalyst layer containing only Pt/C and Nafion is 45.4%. The low utilization is attributed to the fact that the electron conduction of many catalyst particles is impaired by some thick Nafion layers or clumps. For the gas-diffusion (E-TEK) electrode, the platinum utilization is mainly affected by the proton conduction provided by Nafion. The blocking effect of PTFE on the active sites is not serious. When the electrode is sufficiently impregnated with Nafion by an immersion method, the platinum utilization can reach 77.8%. Transmission electron micrographs reveal that although some thick Nafion layers and clumps are observed in the Pt/C + Nafion layer, the distribution of Nafion in the catalyst layer is basically uniform. The melted PTFE disperses in the catalyst layer very uniformly. No large PTFE clumps or wide net-like structure is observed. The reactant gas may have to diffuse evenly in the catalyst layer. (C) 1999 Elsevier Science S.A. All rights reserved.
关键词[WOS]: GAS-DIFFUSION ELECTRODES ;  LOADING ELECTRODES ;  PERFORMANCE
语种: 英语
原文出处: 查看原文
WOS记录号: WOS:000080241100011
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/86155
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

Recommended Citation:
Cheng, XL,Yi, BL,Han, M,et al. Investigation of platinum utilization and morphology in catalyst layer of polymer electrolyte fuel cells[J]. JOURNAL OF POWER SOURCES,1999,79(1):75-81.
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