High-Throughput Screening of Co-Fe-Ni Electrocatalysts for High-Current-Density Water Electrolysis

Abstract

Developing oxygen evolution reaction (OER) catalysts with optimum composition and highly active catalytic centres is a challenge during electrode scale-up. We show a selection strategy for the optimum composition of Co-Fe-Ni catalyst systems through a scanning droplet cell-based high-throughput screening on thin-film materials libraries, followed by fabrication and testing of the selected compositions in the form of catalyst-coated porous electrodes for the OER in alkaline media. The electrode with optimum composition (Co₁₇Fe₂₅Ni₅₈_Ni foam) exhibits a high current density of 1 A cm⁻² during water electrolysis at an operating potential of ∼1.9 V.