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Durable Membrane Electrode Assemblies for Proton Exchange Membrane Electrolyzer Systems Operating at High Current Densities

Lettenmeier, Philipp and Wang, rainey and Abouatallah, Rami and Helmly, Stefan and Morawietz, Tobias and Hiesgen, Renate and Kolb, Svenja and Burggraf, Fabian and Kallo, Josef and Gago, Aldo and Friedrich, K. Andreas (2016) Durable Membrane Electrode Assemblies for Proton Exchange Membrane Electrolyzer Systems Operating at High Current Densities. Electrochimica Acta, 210, pp. 502-511. Elsevier. DOI: 10.1016/j.electacta.2016.04.164 ISBN 00134686 ISSN 0013-4686

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Official URL: http://www.sciencedirect.com/science/article/pii/S0013468616310167

Abstract

High efficiencies, wide operation range and rapid response time have motivated the recent interest in proton exchange membrane (PEM) electrolysis for hydrogen generation with surplus electricity. However, degradation at high current densities and the associated mechanism has not been thoroughly explored so far. In this work, membrane electrode assemblies (MEA) from different suppliers are aged in a commercial PEM electrolyzer (2.5 N m3 H2 h1 ), operating up to 4 A cm2 for more than 750 h. In all cases, the cell voltage (Ecell) decreases during the testing period. Interestingly, the cells with Ir-black anodes exhibit the highest performance with the lowest precious metal loading (1 mg cm-2). Electrochemical impedance spectroscopy (EIS) shows a progressive decrease in the specific exchange current, while the ohmic resistance decreases when doubling the nominal current density. This effect translates into an enhancement of cell efficiency at high current densities. However, Ir concurrently leaches out and diffuses into the membrane. No decrease in membrane thickness is observed at the end of the tests. High current densities do not lead to lowering the performance of the PEM electrolyzer over time, although MEA components degrade, in particular the anode.

Item URL in elib:https://elib.dlr.de/109384/
Document Type:Article
Title:Durable Membrane Electrode Assemblies for Proton Exchange Membrane Electrolyzer Systems Operating at High Current Densities
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Lettenmeier, PhilippDLRUNSPECIFIED
Wang, raineyHydrogenicsUNSPECIFIED
Abouatallah, RamiHydrogenicsUNSPECIFIED
Helmly, Stefanstefan.helmly (at) dlr.deUNSPECIFIED
Morawietz, TobiasHochschule EsslingenUNSPECIFIED
Hiesgen, Renaterenate.hiesgen (at) hs-esslingen.deUNSPECIFIED
Kolb, SvenjaSvenja.Kolb (at) dlr.deUNSPECIFIED
Burggraf, FabianDLRUNSPECIFIED
Kallo, Josefjosef.kallo (at) dlr.deUNSPECIFIED
Gago, Aldoaldo.gago (at) dlr.deUNSPECIFIED
Friedrich, K. Andreasandreas.friedrich (at) dlr.deUNSPECIFIED
Date:20 August 2016
Journal or Publication Title:Electrochimica Acta
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:210
DOI :10.1016/j.electacta.2016.04.164
Page Range:pp. 502-511
Publisher:Elsevier
ISSN:0013-4686
ISBN:00134686
Status:Published
Keywords:PEM electrolyzer; PEM electrolysis system; MEA; Degradation; Impedance spectroscopy; High current density; Accelerated stress tests
HGF - Research field:Energy
HGF - Program:Storage and Cross-linked Infrastructures
HGF - Program Themes:Electrolysis and Hydrogen
DLR - Research area:Energy
DLR - Program:E EV - Energy process technology
DLR - Research theme (Project):E - Electrochemical Processes (Electrolysis) (old)
Location: Stuttgart
Institutes and Institutions:Institute of Engineering Thermodynamics > Electrochemical Energy Technology
Deposited By: Lettenmeier, Philipp
Deposited On:12 Dec 2016 13:50
Last Modified:06 Sep 2019 15:16

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