Preparation And Electrocatalytic Oxygen Evolution Performance Of ZIF-67 Derived Porous Composite Materials

Water can be decomposed into oxygen and hydrogen by electrocatalysis,where oxygen is generated by an oxygen evolution reaction(OER)at the anode and hydrogen is generated by a hydrogen evolution reaction at the cathode.Due to various reasons,these reactions usually proceed slowly,requiring the use of noble metal-based catalysts to promote the reaction process.However,precious metals have limited reserves and are expensive,making it impossible to scale up their use.Therefore,it is crucial to develop efficient and stable non-noble metal electrocatalysts.In the field of energy and electrocatalysis,metal organic frameworks(MOFs)have attracted considerable attention due to their adjustable porosity and high specific surface area.Doping with transition metals such as iron can improve the performance of MOF as an electrocatalyst for oxygen evolution reactions.MOF materials are a class of functional adjustable multicomponent materials,including a variety of nanostructured zeolite imidazolite framework materials(ZIF),such as nanosheets.Nanosheets have unique electronic and catalytic properties and exhibit promising development prospects in many research fields.In recent years,the introduction of composite micelles onto the surface of two-dimensional nanosheets to form uniform mesopores has been widely used in the field of electrocatalysis.This method can not only increase the size of the ion-accessible specific surface area and the number of active sites,but also synergistically enhance the electrochemical performance of the components used in the synthesis of micelles.In this paper,a mesoporous nanosheet was prepared by the self-template method.First,cobalt-based ZIF-67 nanosheets were prepared,and then a composite micelle was prepared using triblock copolymer Pluronic F-127 and dopamine hydrochloride.Finally,using the solution co-induced self-assembly mechanism,the composite micelles were successfully deposited and polymerized on the surface of ZIF-67 nanosheets,resulting in the formation of a polymer with ordered mesopores.After carbonization,oxidation,and phosphating,the obtained product is ultimately used as an electrocatalyst with excellent OER performance.This article aims to explore a cobalt iron-based carbon nanosheet composite material with high activity and use it as an OER catalyst.Through systematic research,we will deeply explore its structural characteristics and electrocatalytic oxygen evolution performance.