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Optimization of the membrane electrode assembly for an alkaline water electrolyser based on the catalyst-coated membrane
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SYSNO ASEP 0557382 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Optimization of the membrane electrode assembly for an alkaline water electrolyser based on the catalyst-coated membrane Author(s) Plevová, M. (CZ)
Hnát, J. (CZ)
Žitka, Jan (UMCH-V) RID
Pavlovec, Lukáš (UMCH-V) RID
Otmar, Miroslav (UMCH-V) RID, ORCID
Bouzek, K. (CZ)Article number 231476 Source Title Journal of Power Sources. - : Elsevier - ISSN 0378-7753
Roč. 539, 15 August (2022)Number of pages 10 s. Language eng - English Country CH - Switzerland Keywords membrane electrode ; alkaline water electrolyser ; catalyst-coated membrane Subject RIV CD - Macromolecular Chemistry OECD category Polymer science Method of publishing Open access Institutional support UMCH-V - RVO:61389013 UT WOS 000833529800001 EID SCOPUS 85130172266 DOI 10.1016/j.jpowsour.2022.231476 Annotation This study deals with the preparation and characterisation of catalyst-coated membranes for an alkaline water electrolysis process. For this purpose, a chloromethylated anion-selective block copolymer of styrene-ethylene-butylene-styrene with 1,4-diazabicyclo[2.2.2]octane functional groups was used both as an alkaline polymer electrolyte membrane and as an ionomer binder. Non-PGM catalysts (platinum group metals), specifically NiCo2O4 and NiFe2O4, were used on the anode and cathode side of the membrane, respectively. Air-brush deposition or computer-controlled ultrasonic dispersion of the catalytic ink were used to deposit the catalyst layers. The influence of the composition of the catalyst layer on its stability and the resulting electrolysis cell performance was investigated under typical membrane alkaline water electrolysis conditions (1–15 wt.% KOH, 45 °C). The optimal catalyst-to-binder ratio in the catalyst layer was identified as 93/7 using a catalyst loading of 2.5 mg cm-2 on each side of the membrane. The membrane electrode assembly prepared under optimal conditions showed high stability over 140 h at a current density of 250 mA cm-2. At this current load, the cell exhibited a voltage of 2.025 ± 0.010 V. The increase in cell voltage observed during the stability test did not exceed 1 μV h-1. Workplace Institute of Macromolecular Chemistry Contact Eva Čechová, cechova@imc.cas.cz ; Tel.: 296 809 358 Year of Publishing 2023 Electronic address https://www.sciencedirect.com/science/article/pii/S0378775322004839
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