A Study On Supercapacitor Electrodes And Breathable Electrodes Based On Copper Nanowire Composite Materials

At present,electronic devices are gradually becoming portable and miniaturized.Portable electronic devices will gradually become the mainstream of the future electronic industry.This requires that the performance and dimensional properties of the material are different from traditional materials.Metal nanowires have unique advantages in the manufacture of electronic devices because of their excellent electrical and mechanical properties.Compared with other materials,copper nanowires(CuNWs)have the characteristics of low cost and excellent electrical conductivity,so CuNWs have very high application value.In this paper,the green polyol reduction method is used to prepare CuNWs,and the application of CuNWs is the main research content.Cu@CuO NWs/CNTs supercapaci tors based on CuNWs and CuNWs/polyvinylidene fluoride(PVDF)gas-permeable electrodes are prepared respectively.And explore the application of CuNWs/PVDF gas-permeable electrode in single-electrode friction nanogenerator.Taking the copper nanowire composite material as the research object.Using the solvothermal method,CuNWs with an average length of 45?m,an average diameter of 37 nm,and an aspect ratio of about 1200 are obtained.The CuNWs have good dispersibility and uniform morphology.CuNWs have excellent flexibility and electrical properties.CuO on its surface has pseudocapacitive properties and CNTs can provide double-layer capacitors.In addition,CNTs also have a one-dimensional nanostructure and can be entangled tightly with CuNWs,which produces a synergistic effect,and has more excellent electrochemical performance.Cu@CuO NWs/CNTs supercapacitors are prepared by vacuum filtration.The obtained Cu@CuO NWs/CNTs supercapacitor has excellent electrochemical performance and cycle stability:its area specific capacitance can reach a maximum of 1.7 F/cm~2,and the capacitance retention rate can reach 97.4%after 5000 cycles.The symmetrical supercapacitor assembled based on Cu@CuO NWs/CNTs electrode has a capacitance retention rate of 88.2%after 5000 cycles.The Cu@CuO NWs/CNTs electrode and the CNTs electrode with a ratio of 1:1 are assembled into a Cu@CuO NWs/CNT//CNTs asymmetric supercapacitor.The device achieves a high volume energy density of 1.46 m Wh/cm~3 at a power density of 22.6 m W/cm~3,and after 5000 cycles of testing,it shows that its capacitance retention rate reaches 92.2%.The PVDF nanofiber substrate was prepared by electrospinning,and the PVDF air-permeable substrate with a diameter of 0.28?m,a contact angle of138.05°and an air permeability of 14.93 mm/s was successfully obtained.Based on CuNWs electrode and PVDF gas-permeable substrate,CuNWs/PVDF gas-permeable electrode was prepared.The CuNWs/PVDF gas-permeable electrode has excellent electrical properties,oxidation resistance and mechanical properties:when the CuNWs electrode load is 0.3 mg/cm~2,the gas-permeable electrode resistance is as low as 0.31?/sq and the air permeability remains at13.01 mm/s.After being placed in the air for 30 days,after the tensile strain reached 40%and after 1000 bending cycles,the square resistance of the CuNWs/PVDF breathable electrode did not increase significantly.Based on CuNWs/PVDF gas-permeable electrodes,a single-electrode friction nanogenerator device with a simple structure and an area of 20 mm×20 mm was designed and fabricated.The output voltage of the device is as high as 88 V,and the power density is up to 0.1 W/m~2,and the output voltage remains basically unchanged after 5000 cycles.