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Investigating Cathode Ionomer Content and Assembly Techniques for Anion Exchange Membrane Water Electrolyzers

Title data

Titheridge, Laura J. ; Sharma, Shailendra ; Soisson, Anouk ; Tiffin, Campbell ; Roth, Christina ; Marshall, Aaron Timothy:
Investigating Cathode Ionomer Content and Assembly Techniques for Anion Exchange Membrane Water Electrolyzers.
In: ACS Electrochemistry. (2025) .
ISSN 2997-0571
DOI: https://doi.org/10.1021/acselectrochem.4c00225

Project information

Project title:
Project's official title
Project's id
Catalyst Strategic Fund
UOCX2118
No information
FKX 03SF0689B

Project financing: Bundesministerium für Bildung und Forschung
New Zealand Ministry of Business, Innovation and Employment

Abstract in another language

Anion exchange membrane water electrolysis
(AEMWE) offers a promising solution for achieving large-scale,
low-cost hydrogen production. Optimizing cathode catalyst-
ionomer-membrane configurations is crucial for improving
AEMWE performance. Herein, cathodes using Pt/C and
Sustainion, PiperION, or Nafion with varying content (5−25 wt
%) and assembly techniques (catalyst-coated substrates, CCSs, and
catalyst-coated membranes, CCMs) are examined to reveal their
impact on AEMWE performance. Scanning electron microscopy
revealed Nafion produced the most homogeneous catalyst layers
and smallest particle sizes. In half-cell testing, 20 wt % Nafion
achieved the lowest overpotential of −15.6 mV at 10 mA cm−2 and
the highest electrochemical surface area of 83.71 cm2 mg−1Pt/C. The
performance trend in CCS was more pronounced than in CCM, as the catalyst layer is deposited layer-by-layer during CCM
fabrication and blocks active sites, obscuring any benefits of optimizing the ionomer loading to achieve minimal agglomeration and
homogeneity. Additionally, CCS outperformed CCM, achieving lower ohmic and charge transfer resistances. The ideal ionomer
content was 15−20 wt % throughout all samples, with 20 wt % Nafion achieving the best performance, owing to the low charge
transfer resistance.

Further data

Item Type: Article in a journal
Refereed: Yes
Keywords: Anion exchange membrane water electrolysis; ionomer; membrane electrode assembly
Institutions of the University: Faculties > Faculty of Engineering Science > Chair Electrochemical Process Engineering > Chair Electrochemical Process Engineering - Univ.-Prof. Dr.-Ing. Christina Roth
Result of work at the UBT: Yes
DDC Subjects: 500 Science > 540 Chemistry
600 Technology, medicine, applied sciences > 620 Engineering
Date Deposited: 21 Mar 2025 08:45
Last Modified: 21 Mar 2025 08:45
URI: https://eref.uni-bayreuth.de/id/eprint/92922