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