Comparison Of CoMoS₄/CoMoO₄,CoMoS₄/CoWO₄ And CoMoS₄/Co₃V₂O₈ As A New Type Of Electrode Materials For Supercapacitors

Due to environmental pollution concerns and fossil energy consumption,it is of special significance to develop alternative energy storage conversion devices with high energy density and power density.Among many power supply devices,supercapacitors,also known as electrochemical capacitors?ECs?,have attracted considerable interest because of their desirable properties.Even so,if supercapacitors are to be used as practical energy devices,they still need high energy density and power density.As far as the development status and trends of supercapacitors are concerned,metal oxide electrode materials have great development prospects and potential.However,in the current reports,the supercapacitance properties of CoMoO₄,CoWO₄,Co₃V₂O_8,and CoMoS₄/materials are still rare,and the preparation methods are complex.Secondly,the performance of single bimetallic oxide is relatively single,each has it is advantages and disadvantages.Accordingly,the composite materials of CoMoS₄/CoMoO₄,CoMoS₄/CoWO₄,and CoMoS₄/Co₃V₂O₈ were designed and fabricated based on CoMoS₄ as a backbone material.1.Design and fabrication of CoMoS₄/CoMoO₄ nanocomposite.The CoMoS₄/CoMoO₄ electrode materials with different morphologies were prepared by one-step chemical method by controlling the relative content of CoMoS₄ and CoMoO₄ in MoO₂/MoS₂ materials.XRD,SEM,and TEM were used to investigate the structure and morphology of MoO₂/MoS₂ materials.In addition,the electrochemical performance differences between CoMoS₄/CoMoO₄ composite electrode and pure CoMoS₄ and CoMoO₄ electrode materials were analyzed.The specific capacitance of the as-prepared CoMoS₄/CoMoO₄ nanocomposite is about 399F g^-1,the rate capability is 80.5%and in addition,the nanocomposite has a good cyclic stability.2.Secondly,based on the study of the CoMoS₄/CoMoO₄ electrode materials,further preparation,and exploration of the CoMoS₄/CoWO₄ electrode materials.The structure and morphology of CoMoS₄/CoWO₄ were characterized by XRD,SEM,and TEM.The electrochemical properties of CoMoS₄/CoWO₄ were tested and the electrochemical properties of CoMoS₄/CoWO₄,CoMoS₄ and CoWO₄ were studied from the electronegative side.The specific capacitance of the as-prepared CoMoS₄/CoWO₄ nanocomposite is about 528F g^-1,the rate capability is 78.8%and also,the nanocomposite possess a good cyclic stability.3.Based on the study of CoMoS₄/CoMoO₄ and CoMoS₄/CoWO₄,the electrochemical properties of CoMoS₄/Co₃V₂O₈ electrode materials were further investigated.CoMoS₄/Co₃V₂O₈,Co₃V₂O₈,and CoMoS₄ electrode materials were prepared and the structure and morphology of the three materials were characterized by XRD,SEM and TEM.The electrochemical properties of the three materials were tested and compared,and the electrochemical properties of the three materials were discussed in this work.The specific capacitance of the as-prepared CoMoS₄/Co₃V₂O₈ nanocomposite is about 584F g^-1,the rate capability is 84.1%and also,the nanocomposite has a good cyclic stability about 93,5%.