Seawater Electrolysis Using All-PGM-Free Catalysts and Cell Components in an Asymmetric Feed

In arid coastal zones, direct seawater electrolysis appears particularly intriguing for green hydrogen production. State-of-the-art electrolyzers, however, show unsatisfactory performance and rely on large amounts of platinum-group metals (PGMs) in the electrodes or hidden as transport layer coatings. Herein, we report an asymmetric-feed electrolyzer design, which all cell components consist PGM-free materials. Cobalt- nickel-based phosphides/chalcogenides not only serve active robust electrocatalysts but also are put forth porous (PTL) surface coatings enhancing selective splitting performance. a systematic design study at single-cell level, integration our catalysts PTLs into membrane–electrode assembly (MEA) using customized, terphenyl-based anion-exchange membrane (AEM). The presented entirely achieves industrially relevant current densities up to 1.0 A cm–2 below 2.0 Vcell standardized alkaline dry cathode operation.