| As a new generation of functional 2D materials,two-dimensional conductive metal-organic frameworks provide high-porosity organic-inorganic hybrid materials formed by self-assembly of organic ligand metal ions or clusters through coordination bonds to provide uniform active sites and open channel.The porosity,catalytic activity,field effect,magnetism and excellent electrical conductivity of two-dimensional MOF further enhance the practicability of two-dimensional MOF as a new generation of multi-functional materials.As a kind of inorganic two-dimensional material,layered double hydroxide?LDH?is characterized by its good biocompatibility,high chemical stability and high specific surface area,and it is widely used in catalysis,separation,biotechnology,The wide application in the fields of electrochemistry has aroused more and more interest in academia and industry.In addition,the effective use of energy is an important goal of China's current energy development,and supercapacitors?SCs?as energy storage devices,due to their own rapid charge and discharge,high power density,long cycle life and high reliability,have attracted more and more attention in the industry.Therefore,this paper is mainly based on the synthesis of two-dimensional conductive MOF from 2,3,6,7,10,11-hexahydroxy benzene ligand,and the combination of MOF and LDH to study the performance of its supercapacitor.The second chapter mainly describes the stable structure of conducting two-dimensional MOF M-CAT embedded on the surface of NiCo-LDH nanoflower which is also two-dimensional material by means of interfacial growth.Interconnection interface of the strong coupling to improve stability of the structure and electronic conductivity,the results show that composite NiCo LDH@Ni-CAT show enhanced capacity storage capacity,including mass capacitance(current density of 1 A g-1 specific capacitance is 882 F g-1),the stability of the circulation capacity?retention rate of 82%after 10000 cycles?and fast charge transfer ability.Asymmetric supercapacitor was assembled to verify the performance of NiCo-LDH@Ni-CAT,and the results showed that the material also had a higher power density 394.6 W kg-1(the energy density of 23.5Wh kg-1).Therefore,this work demonstrates an excellent method for designing and manufacturing a hybrid electrode material based on conductive 2D MOF and LDH for use in energy storage devices.The third chapter mainly introduces the orderly arrangement of NiCo-LDH with Faraday effect and 2D conductive Ni-CAT on the foamed nickel conductive substrate?NF?by hydrothermal synthesis to form Ni-CAT/NiCo-LDH/NF graded integrated nanoarray,without adding any conductive agent and bonding adhesive.In this way,the electrode resistance is greatly reduced.The ordered NiCo-LDH and Ni-CAT's unique two-dimensional structure provide an effective specific surface area,synergistically,providing more active sites,further efficiently promoting charge transfer,thereby improving electrochemical performance.At the current density of 1 mA cm-2,the surface capacitance reached 3200 mF cm-2.Therefore,the preparation of two-dimensional conductive MOF composite materials based on the structure of the study provides a great prospect for the electrochemical energy storage materials.To sum up,this paper aims to design a new composite material based on two-dimensional conductive MOF,and characterize the morphology and composition of the composite material,mainly exploring the application of this material in supercapacitors.The results show that the excellent properties based on two-dimensional conductive MOF,such as conductivity,porosity and large specific surface area,provide a broad application prospect for the development of two-dimensional conductive MOF materials. |
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