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Polybenzimidazole / tetrazole-modified poly(arylene ether) blend membranes for high temperature proton exchange membrane fuel cells

Nagappan, Nambi Krishnan and Duong, Ngoc My Hanh and konovalova, Anastasiia and Jang, Jong Hyun and Park, Hyun S and Kim, Hyoung-Juhn and Roznowska, Aleksandra and Michalak, Artur and Henkensmeier, Dirk (2020) Polybenzimidazole / tetrazole-modified poly(arylene ether) blend membranes for high temperature proton exchange membrane fuel cells. Journal of Membrane Science. Elsevier. ISSN 0376-7388.

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Abstract

Poly(arylene ether)s containing 5-phenyl tetrazole (Tz) and either biphenyl (TzPN) or more flexible phenoxyphenyl (TzPEN) in the backbone were synthesized and blended in different ratios with mPBI, to benefit from the good ratio of conductivity to phosphoric acid (PA) uptake reported for Tz functionalized polymers, and from the high PA uptake and high mechanical strength of mPBI. Blend membranes containing 25 wt% TzPN and TzPEN had PA uptakes of 440 and 322%, respectively, in comparison to 505% for mPBI, but showed higher conductivities at 160 ◦C: 189 for mPBI-TzPN25, 195 for mPBI-TzPEN25, but just 147 mS cm− 1 for mPBI. Most importantly, a PA doped mPBI-TzPEN25 membrane showed an initial peak power density of 447 mW cm− 2, while the peak power density of mPBI was just 348 mW cm− 2. The voltage at 0.2 mA cm− 2 was 0.69 V, which is one of the highest reported values for post-doped membranes. When tested for 2400 h, the OCV of mPBI-TzPEN25 dropped only from 963 mV at the begin to 937 mV at the end of test, indicating that the membrane did not form defects. Over the last 2000 h, the cell was operated at very challenging 800 mA cm− 2. The linear voltage decrease was just 27.7 μV h− 1. Calculations indicate that TZ-PN and TZ-PEN can form chains of hydrogen-bonded TZ units, and low proton-transfer barriers suggest the possibility that the proton conduction mechanism could also partially involve proton hopping involving the tetrazole groups.

Item URL in elib:https://elib.dlr.de/138282/
Document Type:Article
Title:Polybenzimidazole / tetrazole-modified poly(arylene ether) blend membranes for high temperature proton exchange membrane fuel cells
Authors:
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Nagappan, Nambi Krishnannambikrishnan.nagappan (at) dlr.dehttps://orcid.org/0000-0002-3563-050X
Duong, Ngoc My HanhUNSPECIFIEDUNSPECIFIED
konovalova, AnastasiiaUNSPECIFIEDUNSPECIFIED
Jang, Jong HyunUNSPECIFIEDUNSPECIFIED
Park, Hyun SUNSPECIFIEDUNSPECIFIED
Kim, Hyoung-JuhnUNSPECIFIEDUNSPECIFIED
Roznowska, AleksandraUNSPECIFIEDUNSPECIFIED
Michalak, ArturUNSPECIFIEDUNSPECIFIED
Henkensmeier, Dirkhenkensmeier (at) kist.re.krUNSPECIFIED
Date:2020
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
Publisher:Elsevier
ISSN:0376-7388
Status:Published
Keywords:HT PEMFC, Polybenzimidazole, Tetrazole modified poly(arylene ether), Phosphoric acid doping, Blend membrane
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 14:53
Last Modified:03 Dec 2020 14:53

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