Superb All‐pH Hydrogen Evolution Performances Powered by Ultralow Pt‐Decorated Hierarchical Ni‐Mo Porous Microcolumns

Abstract Achieving efficient and robust hydrogen evolution reaction (HER) electrocatalysts under all‐pH conditions is significant for clean hydrogen production. Herein, an ultralow Pt‐decorated hierarchical Ni‐Mo porous hybrid, consisting of Ni 3 Mo 3 N on MoO 2 microcolumns, is developed for all‐pH HER with remarkable catalytic performances, owing to the porous structure, strong metal‐support interaction, along with ultralow Pt nanoparticles and multichannel nickel foam support. The superhydrophilic and aerophilic surfaces favor mass transport during the HER process. Consequently, the porous Pt/Ni‐Mo‐N‐O microcolumns present remarkable HER activity and durability with low overpotentials of 40.6, 101.1, and 89.5 mV to obtain 100 mA cm −2 in basic, neutral, and acid media, respectively. Moreover, the excellent performance in alkaline seawater (40.4 mV@100 mA cm −2 ) even suppresses most of over‐reported catalysts. More importantly, the two‐electrode cell, assembled with Pt/Ni‐Mo‐N‐O and NiMoO 4 as cathode and anode, exhibits excellent performance towards overall‐water electrolysis with an ultralow cell voltage of 1.56 V@100 mA cm −2 .