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Thermally crosslinked sulfonated polybenzimidazole membranes and their performance in high temperature polymer electrolyte fuel cells

Nagappan, Nambi Krishnan and Konovalova, Anastasiia and Aili, David and Li, Qingfeng and Park, Hyun Seo and Jang, Jong Hyun and Kim, Hyoung-Juhn and Henkensmeier, Dirk (2019) Thermally crosslinked sulfonated polybenzimidazole membranes and their performance in high temperature polymer electrolyte fuel cells. Journal of Membrane Science, 588. Elsevier. ISSN 0376-7388.

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Abstract

The degradation pathway of phosphoric acid doped polybenzimidazole membranes in high temperature polymer electrolyte membrane fuel cells depends on the acid contents. If it is high, creep is discussed as the main reason. If it is low (membranes prepared by solvent evaporation and post-doping), the main cause may be loss of acid due to evaporation. The net transport of acid to the anode side at high current densities should also lead to local softening of the membrane, which could be mitigated by crosslinking the membrane. Here we show that sulfonated para-polybenzimidazole membranes can be stabilized by curing at 350 °C. In contrast to meta-polybenzimidazole and sulfonated para-polybenzimidazole, crosslinked sulfonated para-polybenzimidazole is insoluble in dimethylacetamide at room temperature and phosphoric acid at 160 °C. At 160 °C and 5% relative humidity the conductivity of crosslinked sulfonated para-polybenzimidazole and meta-polybenzimidazole is 214 mS cm−1 and 147 mS cm−1, respectively. At 600 mA cm−2, the voltage decay rate is 16 μV h−1, much lower than published for commercial meta-polybenzimidazole (308 μV h−1). Furthermore, the average voltage at 600 mA cm−2 is 523 mV, while a previously published cured meta-polybenzimidazole membrane only reaches 475 mV.

Item URL in elib:https://elib.dlr.de/138281/
Document Type:Article
Title:Thermally crosslinked sulfonated polybenzimidazole membranes and their performance in high temperature polymer electrolyte fuel cells
Authors:
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Nagappan, Nambi Krishnannambikrishnan.nagappan (at) dlr.dehttps://orcid.org/0000-0002-3563-050X
Konovalova, AnastasiiaKorea Institute of Science and TechnologyUNSPECIFIED
Aili, DavidTechnical University of Denmark (DTU)UNSPECIFIED
Li, QingfengUNSPECIFIEDUNSPECIFIED
Park, Hyun SeoUNSPECIFIEDUNSPECIFIED
Jang, Jong HyunUNSPECIFIEDUNSPECIFIED
Kim, Hyoung-JuhnUNSPECIFIEDUNSPECIFIED
Henkensmeier, Dirkhenkensmeier (at) kist.re.krUNSPECIFIED
Date:2019
Journal or Publication Title:Journal of Membrane Science
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:588
Publisher:Elsevier
ISSN:0376-7388
Status:Published
Keywords:High temperature polymer electrolyte fuel cell (HT PEMFC), Sulfonated polybenzimidazole, Thermal crosslinking, Stability, High current density
HGF - Research field:Energy
HGF - Program:Technology, Innovation and Society
HGF - Program Themes:Renewable Energy and Material Resources for Sustainable Futures - Integrating at Different Scales
DLR - Research area:Energy
DLR - Program:E SY - Energy Systems Analysis
DLR - Research theme (Project):E - Energy Systems Technology (old)
Location: Oldenburg
Institutes and Institutions:Institute of Networked Energy Systems > Fuel Cells
Deposited By: Nagappan, Nambi Krishnan
Deposited On:03 Dec 2020 14:51
Last Modified:03 Dec 2020 14:51

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