Preparation And Electrochemical Performance Of 3d Transition Metal Spinel Materials/C Hybrid Material

In this paper,the spinel structure transition metal oxides,metal sulfides and their composite were prepared by different strategies.The materials have been characterized by X-ray powder diffraction,Raman spectra,X-Ray photoelectron spectroscopy,high-resolution transmission electron microscopy and field emission scanning electron microscopy.Different electrochemical measurements have been used to study the electrochemical performance such as cyclic voltammetry,galvanostatic charge/discharge,and electrochemical impedance spectroscopy.The main research of this paper is as follows:1.The oxalate precursor was prepared from nickel acetate,manganese acetate and oxalic acid by co-precipitation.The morphology of the precursor was controlled by compositions of solvent.After calcining in air,the precursor was converted to NiMn2O4.The best calcination temperature was been discovered.The rGO/NiMn2O4 hybrid materials were prepared by adding GO suspension into solvent during co-precipitation process.In order to realize high electrical performances,each hybrid materials with different mass ratio of rGO were characterized by various electrochemical measurements.1.The MOFs precursor was prepared by reaction of zinc acetate,manganese acetate with trimesic acid.In order to fabricate 1-D structure,the precursor was prepared in solvent with different compositions.After calcining in different atmosphere,the rod-like ZnMn2O4 and ZnMn2O4/C hybrid material was obtained.The hybrid materials exhibit high specific surface area(143 m2 g-1)and high performance for supercapacitor.2.The coordination polymer microspheres precursor was prepared by reaction of copper nitrate and cobalt nitrate and isophthalic acid.After sulfurization by solvothermal method,the precursor was converted to core-shell structure Crup,5Co2.5S4.This material exhibits superior electrochemical performance in supercapacitors and oxygen evolution reaction.