Journal Article

FZJ-2026-03216

http://join2-wiki.gsi.de/foswiki/pub/Main/Artwork/join2_logo100x88.png Iron as a key contributor in stability investigations of alkaline water electrolysis electrodes

Thissen, N. (Corresponding author) ; Deo, Y. ; Moreno Fernández, H. ; Seidl, V. ; Hofmann, J. P. ; Mechler, A. K. (Corresponding author)FZJ*RWTH*

2026
Cell Press Maryland Heights, MO

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Please use a persistent id in citations: doi:10.1016/j.xcrp.2026.103138  doi:10.34734/FZJ-2026-03216

Abstract: The optimization of anion exchange membrane water electrolyzers (AEMWEs) relies on active, stable catalysts and well-designed catalyst layers. This study investigates the impact of tumbler ball milling on a nickel–iron layered double hydroxide (Ni3Fe-LDH) catalyst for the oxygen evolution reaction (OER). Milling reduced catalyst clusters from 1-100 μm to 30 nm, increasing the geometrical surface area by 8.8-fold. Optimized solvent compositions and dispersing times enhanced catalyst dispersion stability. Tailoring the electrode structure reduced internal electronic resistances and charge-transfer resistances of the membrane electrode assembly. The optimized electrode exhibited outstanding single-cell performance, reaching 1.83 V at 2 A cm−2 with stable durability of 1000 h and a minor degradation rate of 62 μV h−1. This work presents a scalable approach to NiFe-LDH catalyst treatment and dispersion control, demonstrating the importance of research and optimization across scales to improve performance and support the practical advancement of hydrogen technologies.

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Contributing Institute(s):

1. Elektrochemische Verfahrenstechnik (IET-4)

Research Program(s):

1. 1231 - Electrochemistry for Hydrogen (POF4-123) (POF4-123)
2. DFG project G:(GEPRIS)491111487 - Open-Access-Publikationskosten / 2025 - 2027 / Forschungszentrum Jülich (OAPKFZJ) (491111487) (491111487)

Appears in the scientific report 2026

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