The Synthesis And Electrochemical Performance Study Of Nickel And Cobalt Oxide Composites

Supercapacitors, also known as electrochemical capacitors, is a new type of energy storage components between batteries and electrostatic capacitors, since it has fast rechargeable performance, long cycle life, lightweight form, and combines high power density of traditional physical capacitors and high energy density of chemical battery, which make them one of the most promising candidates for next generation energy device. According to the previous reports of supercapacitors’electrode materials, metal oxides with high specific capacity and excellent electrochemical performance get the most widely attention of researchers, and recent research hotspot mainly focus on the development and applications of the composite electrode materials. On this basis, the paper designed binary metallic oxide composite electrode materials preparation methods for supercapacitors, which let the nickel foam as conductive substrate, CO3O4and NiO layer as core materials, and NIMoO4and CoMoO4layers as shell materials. We also take the test methods such as XRD, SEM and TEM to analyze and characterize the composition, morphology and microstructure of composite electrode materials, and using the electrochemical workstation and blue electric testing system to comprehensive analysis its electrochemical performance. The main contents are as follows:1. We use Co(NO3)2·6H2O and CO(NH2)2as raw materials and let nickel foam as conductive substrate to prepare the precursor by hydrothermal synthesis, and then we obtain the core material of Co3O4nanowires after heat treatment. After that, we use NiCl2·6H2O, CoCl2·6H2O and Na2MoO4·2H2O as raw materials to obtain the Co3O4@NiMoO4and Co3O4@CoMoO4binary metallic oxide composite electrode materials with special structure by hydrothermal synthesis. In order to study the electrochemical behavior of the composite materials, we prepared a series of samples with different reaction temperature, mole ratio of raw material and deposition time. The results show that the electrode materials prepared under the optimal conditions have good crystallinity and regular and orderly morphology, and the electrode materials also have excellent electrochemical performance through electrochemical testing method. At the same time, Co3O4@NiMoO4and Co304@CoMoO4materials could give single electrode specific capacities of2041F g-1and857F g-1respectively.2. We use Ni(NO3)2·6H2O and CO(NH2)2as raw materials and let nickel foam as conductive substrate to prepare the precursor by hydrothermal synthesis, and then we obtain the core material of NiO nanowires after heat treatment. After that, we use NiCl2·6H2O, CoCl2·6H2O and Na2MoO4·2H2O as raw materials to obtain the NiO@NiMoO4and NiO@CoMoO4binary metallic oxide composite electrode materials with special structure by hydrothermal synthesis. In the process of experiments, we prepared a series of samples with different reaction temperature, mole ratio of raw material and deposition time, and studied the electrochemical performance of the electrode materials. Results indicate that the electrode materials synthesised under the optimal conditions have good crystallinity and regular and orderly morphology, therefore, the electrode materials have excellent electrochemical performance and specific capacity.