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题名: Preparation and characterization of stable ionomers and ionomer membranes for fuel cells
作者: Mitovi, S.;  Vogel, B.;  Roduner, E.;  Zhang, H.;  Zhu, X.;  Gogel, V.;  Joerissen, L.;  Hein, M.;  Xing, D.;  Schoenberger, F.;  Kerres, J.
关键词: cross-linked ;  DMFC ;  ESR ;  membranes ;  oxidative degradation ;  PEMFC ;  reinforced
刊名: FUEL CELLS
发表日期: 2006-12-01
DOI: 10.1002/fuce.200600034
卷: 6, 期:6, 页:413-424
收录类别: ISTP ;  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: Membranes based on sulfonated arylene polymers and their cross-linked blends were prepared. Embedding the ionomers into textile or porous PTFE matrix and/or doping with ZrP nanoparticles reduced the swelling, and improved the thermal stability. PTFE reinforcement led to an excellent single cell performance, which is promising for PEMFC applications. Some of the membranes performed better than Nafion(R). The net methanol crossover correlates with the membranae thickness and composition, but surprisingly, suppression of the methanol crossover alone, does not enhance U/I performance. ESR experiments of oxidative degradation of the monomer by OH center dot at pH > 10 leads to phenoxyl and semi-quinone radicals. This study focuses on the case where O-2(center dot-) or O-1(2) are the damaging species, i.e. above pH 11.7, and the dominant reaction is that involving the aromatic ring. Under conditions of fuel starvation, the acid protons get depleted, which may lead to high local pH values, even in an overall acidic environment. It is therefore important to be aware of the entirely different form of degradation chemistry at high pH. In the presence of both HO center dot radicals and oxygen, complete degradation of the aromatic rings can be observed, within hours. In view of this, perfluorinated membranes are more inert. Cross-linked arylene polymer blend membranes and PTFE-reinforced arylene ionomer membranes can be regarded as promising for further development, due to their high stability and excellent PEMFC performance.
关键词[WOS]: BLEND-MEMBRANES ;  HYDROGEN-PEROXIDE ;  MODEL COMPOUNDS ;  DEGRADATION ;  TEMPERATURE ;  PSU
语种: 英语
WOS记录号: WOS:000243332900002
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/140188
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 Stuttgart, ICVT, D-70199 Stuttgart, Germany
2.Univ Stuttgart, IPC, D-70569 Stuttgart, Germany
3.Chinese Acad Sci, Dalian Inst Chem Phys, Proton Exchange Membrane Fuel Cell Key Mat & Tech, Dalian 116023, Peoples R China
4.Zentrum Sonnenenergie & Wasserstoff Forsch Baden, Div 3, D-89081 Ulm, Germany

Recommended Citation:
Mitovi, S.,Vogel, B.,Roduner, E.,et al. Preparation and characterization of stable ionomers and ionomer membranes for fuel cells[J]. FUEL CELLS,2006,6(6):413-424.
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