Preparation And Perforermance Of Modified Binary Transition Metal NiCo Phosphide Electrocatalyst Materials By Doping

At present,the problem of resource shortage and environmental pollution is becoming more and more serious,so sustainable and environmentally friendly energy storage technology has become a hot topic.Electrocatalytic water splitting is considered as a clean method to prepare hydrogen,but its slow kinetics leads to the need to use efficient electrocatalysts to facilitate the reaction.And commonly used noble metal catalysts are not only limited in reserves,but also expensive,which greatly limit the practical application of this technology.By electrodeposition/hydrothermal and plasma two-step treatment,the combination of conductive substrate with phosphides and doping of heteroatoms are realized,and cation and anion-doped modified Ni Co P/CC efficient electrocatalysts are synthesized,respectivelyFirst,Fe doped Ni Co P nanosheet electrocatalysts（Fe_x-Ni Co P/CC）with hierarchical pore structure were successfully prepared by facile electrodeposition and PH₃ plasma treatment two-step method.Owing to the synergistic effect of hierarchical porous nanostructures,fine nanocrystalline grains comprising nanosheets and electron transfer and planar defects caused by Fe doping,Fe_x-Ni Co P exhibits excellent bifunctional electrolytic water splitting performance under alkaline conditions.The results show that the Fe₁-Ni Co P/CC sample with low Fe doping content has the best HER performance with the overpotential of 60 m V to reach 10 m A cm^-2,while Fe₂-Ni Co P/CC with high Fe doping content has the optimal OER performance,and the overpotential is only 293 m V at 50 m A cm^-2.When Fe₁-Ni Co P/CC and Fe₂-Ni Co P/CC are employed as cathode and anode respectively to assemble the electrolytic cell,the cell voltage is only 1.61 V at the current density of 10 m A cm^-2,and the overpotential is only slightly increased after 25 h of continuous electrolytic water,showing excellent stability.Secondly,N doped Ni Co P/CC nanowire electrocatalysts（N_x-Ni Co P/CC）were prepared by hydrothermal and PH₃ and N₂ plasma treatment two-step method,and found to have efficient full p H hydrogen evolution performance.The results show that proper amount of N doping can introduce defects,and can optimize the electronic structure.Combining the advantages of phosphide and high conductivity of substrate,the synthesized N_0.2-Ni Co P/CC samples show excellent HER activity in acidic,neutral and alkaline mediums with the overpotential of 85,111 and 67 m V at a current density of 10m A cm^-2 respectively,and excellent stability.