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Impact of the Relative Humidity on the Performance Stability of Anion Exchange Membrane Fuel Cells Studied by Ion Chromatography

Lorenz, Julian and Janßen, Holger and Yassin, Karam and Leppin, Janine and Choi, Young-Woo and Cha, Jung-Eun and Wark, Michael and Brandon, Simon and Dekel, Dario R. and Harms, Corinna and Dyck, Alexander (2022) Impact of the Relative Humidity on the Performance Stability of Anion Exchange Membrane Fuel Cells Studied by Ion Chromatography. ACS Applied Polymer Materials, 4 (5), pp. 3962-3970. American Chemical Society (ACS). doi: 10.1021/acsapm.2c00415. ISSN 2637-6105.

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Official URL: https://pubs.acs.org/doi/10.1021/acsapm.2c00415

Abstract

Although substantial improvement of the performance of anion exchange membrane fuel cells (AEMFCs) was achieved, longevity is still the main challenge for the AEMFC technology, which is attributed to the degradation of the functional groups of applied membranes and ionomers. Contrary to ex situ material stability studies, we demonstrate here the application of ion chromatography to quantify the amounts of degradation products in the exhaust water during different fuel cell operation conditions on the example of trimethylbenzyl ammonium as a functional group. Higher amounts of degradation products were detected directly after equilibration and completion of polarization curves compared to performance stability measurements under constant load. Moreover, the performance stability dependent on the relative humidity of the anode and cathode feed gases was evaluated. Elevated losses of ionic groups were observed in the anode exhaust water at high humidity fuel cell operation, although higher degradation rates were determined for the cathode side by modeling the performance stability. In contrast, higher amounts of degradation products were detected in the cathode exhaust water under low humidity conditions. However, the mobility of water and degradation products under different fuel cell operation conditions impedes a detailed allocation of the observed degradation to one electrode. The demonstrated combination of in situ electrochemical measurements, corresponding ex situ degradation measurements, and modeling data gives comprehensive insights into the evaluation of the performance stability of anion exchange membrane materials under fuel cell operation, which could exceed ex situ durability experiments based on the membrane materials itself.

Item URL in elib:https://elib.dlr.de/143239/
Document Type:Article
Title:Impact of the Relative Humidity on the Performance Stability of Anion Exchange Membrane Fuel Cells Studied by Ion Chromatography
Authors:
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Lorenz, Julianjulian.lorenz (at) dlr.dehttps://orcid.org/0000-0002-9936-7667
Janßen, HolgerHolger.Janssen (at) dlr.dehttps://orcid.org/0000-0003-0787-8724
Yassin, KaramTechnion - Israel Institute of Technologyhttps://orcid.org/0000-0002-3070-5947
Leppin, JanineInstitute of Networked Energy Systems, German Aerospace Center (DLR)UNSPECIFIED
Choi, Young-WooKorea Institute of Energy Research (KIER)UNSPECIFIED
Cha, Jung-EunKorea Institute of Energy Research (KIER)UNSPECIFIED
Wark, MichaelCarl von Ossietzky Universityhttps://orcid.org/0000-0002-8725-0103
Brandon, SimonTechnion - Israel Institute of TechnologyUNSPECIFIED
Dekel, Dario R.Technion - Israel Institute of Technologyhttps://orcid.org/0000-0002-8610-0808
Harms, Corinnacorinna.harms (at) dlr.dehttps://orcid.org/0000-0001-5916-3224
Dyck, Alexanderalexander.dyck (at) dlr.dehttps://orcid.org/0000-0002-5010-8226
Date:2 May 2022
Journal or Publication Title:ACS Applied Polymer Materials
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:4
DOI :10.1021/acsapm.2c00415
Page Range:pp. 3962-3970
Publisher:American Chemical Society (ACS)
ISSN:2637-6105
Status:Published
Keywords:degradation products, AEMFC, nucleophilic substitution, longevity, quaternary ammonium ions
HGF - Research field:Energy
HGF - Program:Materials and Technologies for the Energy Transition
HGF - Program Themes:Chemical Energy Carriers
DLR - Research area:Energy
DLR - Program:E SP - Energy Storage
DLR - Research theme (Project):E - Electrochemical Processes
Location: Oldenburg
Institutes and Institutions:Institute of Engineering Thermodynamics > Electrochemical Energy Technology
Institute of Networked Energy Systems > Urban and Residential Technologies
Deposited By: Lorenz, Julian
Deposited On:20 May 2022 13:15
Last Modified:20 May 2022 13:15

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