Elucidating the effect of mass transport resistances on hydrogen crossover and cell performance in PEM water electrolyzers by varying the cathode ionomer content

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dc.identifier.uri http://dx.doi.org/10.15488/10222
dc.identifier.uri https://www.repo.uni-hannover.de/handle/123456789/10294
dc.contributor.author Trinke, P.
dc.contributor.author Keeley, G.P.
dc.contributor.author Carmo, M.
dc.contributor.author Bensmann, B.
dc.contributor.author Hanke-Rauschenbach, R.
dc.date.accessioned 2020-12-02T13:04:25Z
dc.date.available 2020-12-02T13:04:25Z
dc.date.issued 2019
dc.identifier.citation Trinke, P.; Keeley, G.P.; Carmo, M.; Bensmann, B.; Hanke-Rauschenbach, R.: Elucidating the effect of mass transport resistances on hydrogen crossover and cell performance in PEM water electrolyzers by varying the cathode ionomer content. In: Journal of the Electrochemical Society 166 (2019), Nr. 8, S. F465-F471. DOI: https://doi.org/10.1149/2.0171908jes
dc.description.abstract An important challenge for polymer electrolyte membrane (PEM) water electrolysis is to reduce the permeation of the produced gases. This crossover affects the cell efficiency and causes safety issues. The crossover increases with current density, most probably due to mass transfer resistances. This work aims to investigate the influence of the cathode ionomer content on hydrogen crossover. Therefore, the ionomer content was varied between 10 and 40 wt% to clearly influence the mass transfer resistances. The best performance and lowest crossover was obtained for 10 wt% ionomer. However, within the observed ionomer range the mass transfer resistances increase with ionomer content that cause increases in hydrogen crossover and cell voltage. Both can be entirely explained by the same quantity of supersaturated dissolved hydrogen concentrations. These supersaturated concentrations cause higher cathode half-cell potentials, which explain the cell voltage increase and lead to higher concentration gradients across the membrane, which enhance the crossover. These findings highlight the importance of mass transfer resistances within catalyst layers in terms of crossover and performance. They constitute an important step in the clarification of the complex interplay between mass transport and voltage losses, enabling the development of novel electrode architectures for PEM water electrolyzers. © The Author(s) 2019. eng
dc.language.iso eng
dc.publisher Bristol : IOP Publishing Ltd.
dc.relation.ispartofseries Journal of the Electrochemical Society 166 (2019), Nr. 8
dc.rights CC BY 4.0 Unported
dc.rights.uri https://creativecommons.org/licenses/by/4.0/
dc.subject Cathodes eng
dc.subject Electrolytic cells eng
dc.subject Hydrogen eng
dc.subject Ionomers eng
dc.subject Mass transfer eng
dc.subject Polyelectrolytes eng
dc.subject Proton exchange membrane fuel cells (PEMFC) eng
dc.subject Concentration gradients eng
dc.subject Dissolved hydrogen concentrations eng
dc.subject Electrode architecture eng
dc.subject Half-cell potential eng
dc.subject Mass transfer resistances eng
dc.subject Mass-transport resistance eng
dc.subject Polymer electrolyte membranes eng
dc.subject Supersaturated concentration eng
dc.subject Gas permeable membranes eng
dc.subject.ddc 540 | Chemie ger
dc.subject.ddc 660 | Technische Chemie ger
dc.subject.ddc 620 | Ingenieurwissenschaften und Maschinenbau ger
dc.title Elucidating the effect of mass transport resistances on hydrogen crossover and cell performance in PEM water electrolyzers by varying the cathode ionomer content
dc.type article
dc.type Text
dc.relation.issn 0013-4651
dc.relation.doi https://doi.org/10.1149/2.0171908jes
dc.bibliographicCitation.issue 8
dc.bibliographicCitation.volume 166
dc.bibliographicCitation.firstPage F465
dc.bibliographicCitation.lastPage F471
dc.description.version publishedVersion
tib.accessRights frei zug�nglich


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