The Studies Of Preparation And Supercapacitor Properties Of Two-dimensional Hydroxide Matrix Composites

LDH is a typical functional material of 2D layered hydroxide,of which uniquely physical and chemical qualities have always interested people in studying and developing.In recent years,electrode materials with excellent properties are also hot spots in the research field of electrochemical new energy.At present,the study of using LDH and LDO as electrode materials has maken the certain achievement.The composite materials,LDH/PANI and LDO/PANI mix the excellent supercapacitor of polyaniline and unique and superior performance of LDH and LDO,which makes it receive widespread attention in the research field of electrochemical materials.The research of this paper is as follows:After preparation of NiCoFe-LDH nanomaterials with different Ni/Co/Fe mole ratio by urea method and analysis of various signs,the LDH-2 with Ni/Co/Fe mole ratio of 2/1/1 has a high crystallinity and interlayer regularity.So LDH is a typical pseudocapacitance electrode material with excellent supercapacitor.Produce the LDO by calcinating LDH at 320?.And use APTS to modify the surface of LDH and LDO and then optimize the condition of amino modification.It finally comes out that the optimal conditions for surface modification of LDH are:reaction time of 6 h,pH 8,modified temperature of 80? and 4%APTS and the best conditions for surface modification of LDO are:reaction time of 5 h,pH 7.5,modified temperature of 80? and 6%APTS.Separately using LDH and LDO as precursor,two kinds of nanocomposite materials,LDH/PANI and LDO/PANI,are successfully produced using in situ polymerization.Through the analysis of various characterization of composite materials,it draws a conclusion that polyaniline is produced after situ polymerization of aniline monomer at surface of precursor and the concerted reaction of polyaniline and precursor can obviously improve the conductivity of composite materials.Through the performance test of supercapacitor,it is found that the introduction of PANI can provide higher pseudocapacitance;the precursor functions as a framework;and the concerted reaction of polyaniline and precursor develops the supercapacitor performance of the composite materials.Compared with the matrix materials-LDH and LDO,the capacitance of composite materials is greatly improved.The cyclic stability of the composites LDH/PANI and LDO/PANI is excellent.After 1000 cycles,the retention rate of capacity is 84.69%and 86.04%respectively,and the coulomb efficiency can be maintained at 90%.They are asupercapacitor electrode materials with great potentiality and practical application.