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Mayerhöfer, Britta [Author]; Ehelebe, Konrad [Author]; Speck, Florian D. [Author]; Bierling, Markus [Author]; Bender, Johannes [Author]; Kerres, Jochen [Author]; Mayrhofer, Karl J. J. [Author]; Cherevko, Serhiy [Author]; Peach, Retha [Author]; Thiele, Simon [Author]

On the effect of anion exchange ionomer binders in bipolar electrode membrane interface water electrolysis

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  • Media type: E-Article
  • Title: On the effect of anion exchange ionomer binders in bipolar electrode membrane interface water electrolysis
  • Contributor: Mayerhöfer, Britta [Author]; Ehelebe, Konrad [Author]; Speck, Florian D. [Author]; Bierling, Markus [Author]; Bender, Johannes [Author]; Kerres, Jochen [Author]; Mayrhofer, Karl J. J. [Author]; Cherevko, Serhiy [Author]; Peach, Retha [Author]; Thiele, Simon [Author]
  • imprint: RSC, 2021
  • Published in: Journal of materials chemistry / A 9(25), 14285-14295 (2021). doi:10.1039/D1TA00747E
  • Language: English
  • DOI: https://doi.org/10.1039/D1TA00747E
  • ISSN: 2050-7488; 2050-7496
  • Origination:
  • Footnote: Diese Datenquelle enthält auch Bestandsnachweise, die nicht zu einem Volltext führen.
  • Description: Bipolar membranejelectrode interface water electrolyzers (BPEMWE) were found to outperform a protonexchange membrane (PEM) water electrolyzer reference in a similar membrane electrode assembly(MEA) design based on individual porous transport electrodes (PTE) and a free-standing membrane. Wepresent a detailed study on bipolar interfaces between anion exchange ionomer (AEI) based anodecatalyst layers in direct contact with a PEM aiming to unravel influences of local pH, the water splittingbipolar interface and catalyst layer structure. It is conventionally accepted that AEIs used in anionexchange- and bipolar membrane water electrolysis conduct hydroxide anions and ensure a high pHenvironment in the catalyst layer. We have investigated the effect of different ionomers on the local pHat a metal surface and found a strong correlation with the pH of the surrounding solution rather than theionomer type. Thus, solely the use of an AEI cannot maintain high pH. A study on BPEMWEs revealedstrong indications for the co-existence of a water dissociating bipolar interface, and an acidic oxygenevolution mechanism. The superior performance compared to a PTE-based PEM water electrolyzerseems to stem from reduced contact resistances due to adhesive effects between the oppositelycharged polymers. Our study shows that the bipolar approach can be utilized to make PTE-basedelectrolyzers competitive to commonly employed catalyst coated membranes.
  • Access State: Open Access