Highly Stable Porous Nickel–Iron (Oxy)Hydroxide Layer Electrodeposited on Nickel Foam as Anodes for an Anion Exchange Membrane Water Electrolyzer

The development of high-performance and durable electrodes using anion-exchange membrane water electrolyzers (AEMWEs) is essential for sustainable and highly efficient hydrogen production. In this study, we developed a three-dimensional (3D) porous nickel–iron oxyhydroxide (NiFeOOH) anode for an AEMWE. The porous NiFeOOH layer was directly fabricated onto Ni foam by a one-step electrodeposition process with a pulse current (PC) application without the presence of a nonelectrically conductive ionomer. In addition, the effect of the PC electrodeposited anode on the AEMWE performance and durability was investigated by comparing other anodes (the electrodeposited anode using the direct current (DC) process and the conventional anode using the spraying method). This ionomer-free and porous anode showed a higher performance in reducing the Ohmic resistance than the electrodeposited anode with …