Directly Coated Iridium Nickel Oxide on Porous‐Transport Layer as Anode for High‐Performance Proton‐Exchange Membrane Water Electrolyzers

Developing a high-performance anode design is important for low-cost proton-exchange membrane water electrolyzer (PEMWE). In this study, an iridium nickel oxide directly coated (IrNiOx electrode) high-efficient PEMWE reported. Five IrNiOx electrodes with different Ir-to-Ni ratios are developed using co-electrodeposition. The resulting contain thin layer on the carbon substrate. To develop incorporating electrode, effect of fabrication methods, catalyst compositions, and porous transport investigated. Consequently, electrode prepared 7:3 precursor solution (Ir0.5Ni0.5Ox) exhibits higher oxygen evolution reaction activity smaller overpotential than 10:0 (IrOx) commercial IrO2. Furthermore, performance Ir0.5Ni0.5Ox that sprayed IrO2 nanoparticles. This enhancement attributed to high electrochemical surface area caused by introducing Ni in IrOx. Additionally, highest reported literature.