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Ion-solvating membranes as a new approach towards high rate alkaline electrolyzers

Kraglund, Mikkel Rykaer and Carmo, Marcelo and Schiller, Günter and Ansar, Syed Asif and Aili, David and Christensen, Erik and Jensen, Jens Oluf (2019) Ion-solvating membranes as a new approach towards high rate alkaline electrolyzers. Energy & Environmental Science. Royal Society of Chemistry. DOI: 10.1039/c9ee00832b ISSN 1754-5692

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Energy efficient and cost efficient water electrolysis is essential for the large scale implementation of renewable energy. The two commercial low temperature electrolyzer technologies each suffer from serious drawbacks. The proton exchange membrane (PEM) electrolyzers remain expensive and depend strongly on the scarce metal iridium. The alkaline electrolyzers suffer from a large footprint due to low rate capability. Here, we present an approach to make an alkaline electrolyzer perform like a PEM electrolyzer by means of an ion-solvating membrane. A long lasting effort to replace the state-of-the-art thick porous diaphragm by an anion exchange membrane has not proven successful. The ion-solvating membrane represents a third way. Demonstration cells based on KOH doped polybenzimidazole membranes and nickel based electrodes exhibited 1700 mA cm-2 at 1.8 V. This is far exceeding what has previously been achieved with membranes in alkaline environments without platinum group metal catalysts, and is comparable to state-of-the-art PEM electrolyzers.

Item URL in elib:https://elib.dlr.de/128645/
Document Type:Article
Title:Ion-solvating membranes as a new approach towards high rate alkaline electrolyzers
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Kraglund, Mikkel RykaerTechnical University of Denmark (DTU)UNSPECIFIED
Carmo, MarceloForschungszentrum JülichUNSPECIFIED
Schiller, GünterGuenter.Schiller (at) dlr.dehttps://orcid.org/0000-0001-5093-7625
Ansar, Syed AsifSyed-Asif.Ansar (at) dlr.deUNSPECIFIED
Aili, DavidTechnical University of Denmark (DTU)UNSPECIFIED
Christensen, ErikTechnical University of Denmark (DTU)UNSPECIFIED
Jensen, Jens OlufTechnical University of Denmark (DTU)UNSPECIFIED
Date:22 July 2019
Journal or Publication Title:Energy & Environmental Science
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In ISI Web of Science:Yes
DOI :10.1039/c9ee00832b
Lewis, NathanRoyal Society of Chemistry
Publisher:Royal Society of Chemistry
Series Name:Energy & Environmental Science
Keywords:Alkaline water electrolysis, ion-solvating membrane, Raney nickel-type plasma sprayed electrodes, high-performance electrolyzer, energy-efficiency
HGF - Research field:Energy
HGF - Program:Storage and Cross-linked Infrastructures
HGF - Program Themes:Fuel cells
DLR - Research area:Energy
DLR - Program:E SP - Energy Storage
DLR - Research theme (Project):E - Electrochemical Processes (Fuel Cells)
Location: Stuttgart
Institutes and Institutions:Institute of Engineering Thermodynamics > Electrochemical Energy Technology
Deposited By: Schiller, Dr.rer.nat. Günter
Deposited On:23 Aug 2019 15:41
Last Modified:23 Aug 2019 15:41

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