LAUSR

Large-current-density electrocatalytic water splitting is essential for industrial hydrogen production, but it is currently hindered by lacking active and robust hydrogen evolution reaction (HER) catalysts. Herein, we report a novel electrode of hollow nanowire arrays constructed by NiCo modified RuO 2 nanoparticles on Ni foam (NiCo@RuO 2 HNAs/NF) for high-performance HER. Such efficient electrode is fabricated by ion exchange with NF-supported Ni modified cobalt carbonate hydroxide nanowire arrays template (Ni@CoCH NAs/NF). The formed NiCo@RuO 2 HNAs/NF only needs overpotentials of 148.5 and 236.1 mV to deliver 500 and 1000 mA cm -2 , respectively, along with excellent stability at the high-current-density for 300 h. Such remarkable HER performance is mainly attributed to the hollow structure with high surface area, hydrophilic feature, and NiCo@RuO 2 with optimized hydrogen evolution kinetics. After coupling with anodic Ni@CoCH NAs/NF, our electrolyzer outperforms Pt/C-IrO 2 and most other Ru-based electrolyzers. This work provides a promising Pt alternative catalyst for profitable H 2 production.