Three-dimensional Porous V₂O₅for Supercapacitor

As a new type of energy storage equipment, supercapacitor hasattracted much attention. Compared to the traditional energy storageequipment, supercapacitor has a series of advantages, such as high powerdensity, fast charge-discharge speed and long life cycles. Also, it,senvironmental pollution-free. Electrode materials will determine thestorage properties of supercapacitor. As a result, the research ofsupercapacitor is mainly focused on the preparation of high performanceelectrode materials. The research has become more important on how toimprove the capacity of the capacitors and energy density. Suercapacitorsusing metal oxides will have chemical reactions during the process ofcharge or discharge. So, in the range of reported electrode materials forsupercapacitors, metal oxides exhibit higher specific capacitance thancarbon materials, is one of the most important materials for nextgeneration supercapacitor with high energy density. Therefore, in thisarticle, V2O5is studied for the preparation of electrode materials. Themain contents are as follows:(1) Introduction of the supercapacitorFirstly, this article gives a detailed introduction of supercapacitor.In this paper, the development process of supercapacitor is introduced,along with its three main parts.(2) The preparation and physical characterization ofthree-dimensional porous V2O5for supercapacitorIn the paper, V2O5is used for the preparation of electrode materials.V2O5. V2O5has a rich resource. Also, it has a high theoretical specificcapacity. In order to get a higher specific capacity, V2O5was preparedwith a three-dimensional porous structure. There are three ways to prepare materials with three-dimensional porous structure. These ways aretemplating method, sol-gel method and sputtering method. In this paper,three-dimensional porous V2O5are synthesized by a templating method.Polystyrene film is used as the electrochemical deposition template. Thenthe template will be resolved to get the three-dimensional porous V2O5.The morphology, structure and surface property of three-dimensionalporous V2O5are investigated intensively by a variety of means such as X-raydiffraction (XRD) and scanning electron microscopy (SEM).(3)The research on electrochemical performance of three-dimensionalporous V2O5supercapacitorElectrochemical performance test shows that at the scan rate of5mV/s,the specific capacity is531.25F/g. When the scan rate rose from5mV/sto50mV/s, the supercapacitor shows a capacity retention of42.59％.