Study On The Supercapacitive Property Of NiCo-Based Phosphide-Carbon Compound

With the development of society and the improvement of ecology awareness,how to balance the growing energy demand and environmental pressure and seek sustainable development has become a top priority.As the most important process energy,electric power is in urgent need of efficient and convenient energy storage and conversion equipment.In order to meet the needs of power conversion and storage,the research and development of electrode materials play an important role.This paper focuses on how to improve the electrochemical performance of single transition metal phosphide electrode materials for supercapacitors through component control,morphology design and process recombination.(1)2D nickel cobalt phosphide/CC self-supporting flexible electrode material was prepared by in-situ hydrothermal method.The sample of Ni Co-P(1:2)/CC has the best electrochemical performance,and Ni:Co=1:2 is the best element ratio.On the other hand,phosphating treatment can improve the electrochemical activity of the materials.The specific capacitance of Ni Co-P(1:2)/CC can reach 1027.4 F g^-1 at 1 A g^-1.(2)Graphene and nickel cobalt bimetallic phosphide needle like nanowires were synthesized in situ by one-step hydrothermal method.Ni doping and GO composite can effectively improve the electrochemical properties of the materials.Phosphating treatment can further improve the electrochemical performance of the materials.The specific capacitance of Ni-Co P/r GO needle like nanowire composite electrode can reach 3794 F g^-1 at 1 A g^-1.(3)MOFs grown on CNT were used as precursors.Ni were introduced by solvent ion exchange to form bimetallic MOF.Ni doping and CNTs composite can effectively improve the electrochemical properties of the materials.Phosphating treatment can further improve the electrochemical performance of the materials.After air sintering and phosphating,the material contains amorphous carbon coated grains and porous structure.The specific capacitance of Ni-Co P@C@CNT composite can reach 708.1 F g^-1 at 1 A g^-1.