Optimized NiFe-LDH catalyst layers boost anion exchange membrane water electrolyzer performance and durability
International Journal of Hydrogen Energy
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.
Authors 9
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Affiliation as printed
Forschungszentrum Jülich
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Affiliation as printed
Forschungszentrum Jülich
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Anna K. Mechler Aachen
Forschungszentrum Jülich · RWTH Aachen University
Affiliation as printed
Forschungszentrum Jülich
RWTH Aachen
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