Study On Electronic Structure And Water Electrolytic Properties Of BMOFs Based Regulated By Interfacial Defect Engineering

"Hydrogen energy technology" is one of the key national research and development directions proposed in the 14 th Five-Year Plan,and is also one of the excellent solutions for reducing carbon emissions and mitigating climate change globally.Hydrogen production from water electrolysis has attracted extensive attention due to its advantages of environmental protection and low cost..In this paper,abundant and inexpensive transition metal materials are studied,with a focus on bimetallic MOFs(BMOFs)and transition metal oxide/hydroxide composites.Interface construction methods and defect introduction strategies are systematically studied to reveal that introducing oxygen vacancies and constructing heterostructured interfaces can endow electrocatalytic materials with strong electronic interactions,thus exhibiting excellent electrocatalytic performance.(1)Bimetallic Cu Co-ZIF with a large specific surface area was deposited onto Fe2O3 nanorods to form an Fe2O3@Cu Co-ZIF heterostructured interface.Oxygen vacancies were introduced by low-temperature heat treatment.Due to the synergistic effect between metals,BMOFs can increase the electrochemical surface area and improve their conductivity.The construction of hetero-interface and the introduction of oxygen vacancies have modified the electronic structure of the material and improved its charge transfer ability,thereby reducing the energy barrier required for the water splitting reaction process.(2)Ni Fe-LDH was used as a sacrificial template,and by controlling the reaction time,a controllable conversion of part of Ni Fe-LDH to BMOFs was achieved,forming ultra-thin BMOFs/LDH hybrid nanosheet structures.This heterostructure generates abundant BMOFs/LDH interfaces on the catalyst surface,which endows it with rich active sites and fast charge transfer.Moreover,the BMOFs/LDH hybrid nanosheets synthesized by this method have a higher concentration of oxygen vacancies than the original LDH material.The results show that the combination of vacancy and interface engineering gives this electrocatalytic material good water electrolysis performance.