Simultaneous heterostructure engineering and Mn doping modulation of Ni2P nanosheet arrays for enhanced electrocatalytic water splitting

Efficient, low-cost, and stable electrocatalysts for water splitting are highly desirable. Herein, three-dimensional (3D) Ni2P nanosheet arrays were fabricated simultaneously modulated by heterostructure engineering Mn doping (Mn-doped Ni2O3/Ni2P Mn-doped NixSy/Ni2P) via a facile hydrothermal reaction subsequent phosphorization sulfurization. Due to the doping, synergistic effect in heterostructures, abundantly exposed active sites from 3D-nanosheet arrays, NixSy/Ni2P exhibit excellent properties hydrogen evolution (HER) oxygen (OER), respectively. The former achieves an current density of ?10 mA cm?2 at low overpotential 104 mV HER, while latter attains 100 OER ultralow 290 exhibits superior stability 50 160 h. Impressively, Ni2O3/Ni2P//Mn-doped couple show high overall-water-splitting activity with cell voltage 1.65 V 10 outstanding durability 120 h alkaline electrolyzer. This work presents effective strategy design synthesize low-cost non-noble metal overall through simultaneous application engineering, foreign-metal-atom 3D-nanoarray structure. brings paradigm shift toward mass production renewable energy devices.