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  Influence of thermal post-curing on the degradation of a cross-linked polybenzimidazole-based membrane for high temperature polymer electrolyte membrane fuel cells

Ossiander, T., Perchthaler, M., Heinzl, C., & Scheu, C. (2014). Influence of thermal post-curing on the degradation of a cross-linked polybenzimidazole-based membrane for high temperature polymer electrolyte membrane fuel cells. Journal of Power Sources, 267, 323-328. doi:10.1016/j.jpowsour.2014.04.158.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-0024-B8B2-F Version Permalink: http://hdl.handle.net/21.11116/0000-0001-6E5F-B
Genre: Journal Article

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 Creators:
Ossiander, Tanja1, Author              
Perchthaler, Markus2, Author              
Heinzl, Christoph3, Author              
Scheu, Christina4, Author              
Affiliations:
1Department of Chemistry, Ludwig-Maximilians-University Munich, Butenandtstr. 11, 81377 Munich, Germany, ou_persistent22              
2Institute of Chemical Engineering and Environmental Technology, Fuel Cell Systems Group, Graz University of Technology, Steyrergasse 21, Graz 8010, Austria, ou_persistent22              
3Department of Chemistry, LMU Munich, Germany, ou_persistent22              
4Department of Chemistry, University of Munich (LMU), Butenandtstrasse 5-13, 81377 Munich, Germany, ou_persistent22              

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Free keywords: PHOSPHORIC-ACID; PBI MEMBRANES; PERFORMANCE; SEPARATION; REDUCTION; LINKINGElectrochemistry; Energy & Fuels; High temperature polymer electrolyte membrane; Fuel cell; Polybenzimidazole; Thermal post-curing; Degradation mechanisms;
 Abstract: The lifetime stability of membranes is one of the main requirements regarding reliability of high temperature polymer electrolyte membrane fuel cells. The present work has improved durability under cycled operation by thermal post-curing of cross-linked polybenzimidazole (PBI)-based membranes. The membranes were dried over 1, 2 and 3 h at 250 degrees C under air. Ex-situ experiments proved an increase in stability by post-curing. The liquid uptake and swelling in phosphoric acid increased with longer curing periods. The effect of thermal treatments on cycle stability, lifetime and begin-of-life performance of the membrane electrode assemblies (MEAs) was investigated. Longer post-curing periods of the membranes had no influence on the MEAs' begin-of-life performance and constant current behavior over 2300 h. However, the 3 h post-cured MEAs showed enhanced cycle stability. Post-mortem analysis was carried out to identify the occurring degradation mechanisms. While a significant loss of phosphoric acid and a reduction of electrochemical surface activity on the cathode were observed for both post-cured MEAs, the 3 h dried membrane sample had a significantly higher resistance against pinhole formation during the long term test. Altogether, this work presents thermal post-curing as a promising method for the reduction of degradation determining effects in fuel cell membranes. (C) 2014 Elsevier B.V. All rights reserved.

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Language(s): eng - English
 Dates: 2014-12-01
 Publication Status: Published in print
 Pages: 6
 Publishing info: -
 Table of Contents: -
 Rev. Method: Peer
 Degree: -

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Title: Journal of Power Sources
  Abbreviation : J. Power Sources
Source Genre: Journal
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Publ. Info: Amsterdam, The Netherlands : Elsevier
Pages: - Volume / Issue: 267 Sequence Number: - Start / End Page: 323 - 328 Identifier: ISSN: 0378-7753
CoNE: /journals/resource/954925527849