Research On The Performance Of Self-powered Supercapacitors Optimized By ZnO Nanostructures

Because of the fast charge and discharge speed,long service life,good cycle stability,small size,and high power density,supercapacitors are considered as promising alternatives to rechargeable batteries and are gradually being used in new energy vehicles and wearable electronics devices,aerospace equipment and other fields.In addition,self-powered supercapacitors also have the advantages of not requiring external charging,environmental protection,and multi-function,and have broader application prospects.In this paper,a sandwich structure piezoelectric self-powered supercapacitor(SSPSC)optimized based on ZnO nanostructures is fabricated,using flexible carbon cloth(CC)as the substrate ZnO/Ni O core-shell structure as the energy storage electrode;PVDF-Tr FE/ZnO NRs composite piezoelectric film acts as a separator and also provides piezoelectric output for the self-powered process of the device;KOH/PVA acts as a solid electrolyte.The piezoelectric output characteristics of the PVDF-Tr FE/ZnO separator under the action of external force enable the SSPSC device to be effectively self-powered without any rectifier device.In this paper,ZnO nanostructures are used to enhance two functions in SSPSC devices:(1)During the electrode energy storage process,ZnO nanorods not only serve as a support template with excellent conductivity to increase the specific surface area of Ni O nanosheets,but also formed the core-shell structure with Ni O to optimizes the electrical performance of the electrode.At the same time,this article discusses the electrochemical performance of composite electrodes obtained with different CBD deposition times,and found that the deposition time of 20min is the best.(2)In the energy supply process,ZnO is incorporated into PVDF-Tr FE as a nucleating agent,which effectively increases the?-phase content of PVDF-Tr FE,thereby improving its piezoelectric output characteristics.According to the control experiment test,the incorporation amount of 10wt%is the best.ZnO is a very promising semiconductor material,and its excellent properties are utilized to a great extent in this paper.The area specific capacitance of the prepared SSPSC device can reach 43.07m F/cm~2,and the self-powered speed is up to 9.61?C/s,which is good in similar devices.At the same time,as a flexible energy storage device,its power storage capacity(6h maintains 80%of charge)and good flexibility(flexible90°/180°device performance remains stable)have proved its great potential in the field of wearable electronics in the future.