Preparation And Electrochemical Performance Of MOF Derivatives And Graphene Composites

In this paper,MOF-derived bimetallic hydroxide/sulfide/phosphide with hollow polyhedron structure connect with graphene were prepared.The phase and morphology of various composites have been characterized by some technologies including X-ray diffraction,Raman spectra,X-ray photoelectron spectroscopy,field emission scanning electron microscopy and transmission electron microscopy.In addition,the electrochemical performance of various as-prepared materials were studied by some electrochemical measurements of cyclic voltammetry(CV),galvanostatic charge/discharge(GCD)and electrochemical impedance spectroscopy(EIS).The specific research can be divided into the following three aspects:1.In-suit growth ZIF-67 on the surface of GO to form ZIF-67/GO precursor,and then the C/ZIF-67/r GO intermediates were obtained by calcining above precursor under N2.Finally,the C/Ni Co-LDH/r GO composites with hollow polyhedron structure were synthesized by a simple reflux procedure.Meanwhile,in order to confirm the optimal joining the quality of GO,this experiment investigated electrochemical performance about various composites with different qualities of GO.2.ZIF-67 was regarded as the precursor,which was partial chemically etched and co-precipitated to form ZIF-67@Ni Co-LDH intermediate,and then NCS with hollow polyhedron structure was prepared by hydrothermal sulfuration and calcinating processes.Finally,the NCS/r GO composite was obtained by a simple hydrothermal reaction between NCS and GO.In addition,we also studied the electrochemical performance of various composites with different amounts of GO,and the results confirmed the optimal performance for the NCS/r GO-5 composite.3.The Ni Co-LDH intermediate was prepared by the chemical etching and co-precipitated of ZIF-67 precursor.And than Ni Co-LDH was coated with GO to form Ni Co-LDH@GO hybride material.Finally,the hybride material was converted to Ni Co P@r GO composite with hollow polyhedron structure by phosphating via chemical vapor deposition(CVD)method.Comparing to Ni Co-LDH and Ni Co P material,Ni Co P@r GO exhibited enhance electrochemical performance.