High-Performance AEM Electrolysis Without Platinum Group Metals

The research team deposited a catalytically active nickel-sulfur layer directly onto a porous stainless steel nonwoven fabric. The cathodes produced in this way do not require platinum group metals and achieved a current density of 2.5 amperes per square centimeter at 2.0 volts in AEM electrolysis.

Electrodeposition combines the production of the catalyst and its integration into the porous electrode in a single process step. Measurements also show low charge transfer losses and good electrical contact between the catalyst layer and the substrate.

During operation, the surface of the cathode changes: sulfur is partially leached out, while nickel-rich oxide and hydroxide structures form. The findings suggest that this restructuring is not equivalent to simple, irreversible damage to the cathode.

The results have been published in the open-access article “Electrodeposited Ni–S Cathodes on Stainless Steel Nonwovens for PGM-Free Anion Exchange Membrane Water Electrolysis at High Current Density.” The article will appear in the Journal of Power Sources, Volume 690, on 30 October 2026, under article number 240732, and is available online.