Electrocatalytic Oxygen Evolution Reaction Performance Of Nickel-based Metal Organic Framework And Derivatives

Hydrogen had the advantages of high energy density,large heating value,and zero emission of global warming gas when in used,so it was a fantastic choice for zero pollution to the environment and a substitute for fossil energy.The current idea and promising automated method was using used electrochemical methods to split water into oxygen and hydrogen.However,the precious metal electrocatalysts currently used were small in reserve and high in cost,which limits their large-scale industry used.The Metal-Organic Framework（MOF）,which had the benefits of porosity and large specific surface area,had been widely investigated in fields such as catalysis and adsorption.In this study,solvothermal method was used to grow in situ Ni-based MOF doped with transition metal（Fe,Co,Mn）on the surface of nickel foam（NF）.Among them,the scaly NiCo-MOF/NF has the best performance.Under the condition of 1 M KOH,the overpotential required to reach a current density of 50 mA·cm^-2is 370 m V.In order to prepare electrocatalysts for better OER performance,the following optimization schemes have been adopted for NiCo-MOF/NF materials:（1）NiCo-MOF/NF was used as a self-sacrificial template by heat treatment,and NiCo-C/NF bimetallic particles supported on graphite carbon（NiCo-C/NF）were successfully prepared on the surface of NF under a nitrogen atmosphere at 500℃.After optimized heat treatment,under the condition of 1 M KOH,the overpotential required for NiCo-C/NF to reach a current density of 50 mA·cm^-2 is 340 m V.（2）Through a one-step solvothermal synthesis method,a 3D nano-flower-like metal-organic framework（NiCo S-MOF/NF）containing sulfur-doped Ni and Co bimetallic ions is grown in situ on the surface of NF.Under 1 M KOH conditions,a current density of 100 mA·cm^-2 can be achieved with only 247 m V of overpotential...