Preparation Of MOF Derived Ni@NC Catalysts And Study Of Its Performance Of Electrolytic Water

In recent years,the world has actively advocated a green,environmentally friendly and low-carbon lifestyle,and hydrogen has been vigorously developed as a clean energy.Water electrolysis is one of the common ways to produce hydrogen.However,noble metals are widely used as catalysts for electrolytic water nowdays,which greatly increases the cost of hydrogen production from electrolytic water.Ni MOF-based material have been widely studied due to its attractive price,numerous varieties and excellent catalytic performance.However,the problem of the stability of Ni MOF-based materials in alkaline electrolyte has yet to be solved.Therefore,the production of stable,long-lived Ni MOF derivative catalytic materials is of great significance.Generally,the methods to improve the stability of materials include adjusting the structure of materials and doping other elements.Based on this,the research contents of this paper are as follows:（1）The core-shell structure of Ni@NC was constructed by the solvent heat-annealing method.The catalytic material of core-shell structure uses the outer carbon shell structure to avoid the inner metal particles directly exposing to the alkaline electrolyte,thus extending the life of the catalyst.It solves the problem that the catalyst is easy to be oxidized,dissolved and deteriorated in the process of electrocatalysis.Meanwhile,the content of N element in Ni MOF derivatives is controlled by changing the target temperature of annealing,and the anchoring effect of N element on nickel metal particles is used to prolong the life of catalyst materials.（2）The performance of electrocatalytic hydrogen and oxygen evolution of the sample in 1 M potassium hydroxide solution was tested.When the current density is 10m A cm^-2,the overpotential of the electro-catalytic hydrogen evolution reaction is 113m V.During the oxygen evolution reaction,the synthesized sample can drive a current density of 10 m A cm^-2at an overpotential of 311 m V.The sample has excellent durability and can maintained for 72 hours at a current density of 10 m A cm^-2.After4000 cycles,it still maintains the initial catalytic activity.