The Characteristics Of Supercapacitor Based On Two-Dimensional Antimonene Flexible Transparent Composite Electrode

In recent years,with the progress of science and technology and their connection with life,flexible and transparent electronic products become the research hotspot.Flexible transparent supercapacitors（FTSCs）,as a key component to ensure the flexibility and transparency of devices,have been widely concerned.Two-dimensional antimonene in two-dimensional material family has excellent physical and chemical properties and large specific surface area,which has great application potential in electrochemical devices.High mechanical strength,excellent optoelectronic properties,but inbreakable capacitance density limit the development of FTSCs.The application of two-dimensional antimonene to FTSCs may improve specific capacitance.This thesis mainly includes four parts.The first part is the research background.Firstly,supercapacitors are classified according to different charge storage mechanisms:double-layer supercapacitors（EDLCs）,pseudocapacitors and hybrid supercapacitors,in which composite capacitive electrodes are used.Secondly,the performance parameters of the supercapacitor are sorted out,the factors affecting the area specific capacitance（C_A）are studied,and the possibility of improving the specific capacitance of two-dimensional antimonene is determined.Then,the preparation methods of two-dimensional nanomaterials were discussed,and the characteristics,advantages and disadvantages of two-dimensional products in various preparation methods were summarized.It was determined to use the hot injection method in solution chemical synthesis to prepare pure two-dimensional antimonene with controllable thickness.The common electrode materials for flexible transparent supercapacitors and their development and research progress are summarized.In the second part,two-dimensional antimonene was prepared by hot injection method.Phosphinate-antimony trichloride and mercaptan antimony trichloride were used as precursors,and irregular granular products and hexagonal two-dimensional antimonene nanosheets were obtained,respectively.The factors affecting the growth of two dimensional antimonene such as halogen and precursor temperature were investigated.In the end,high quality two-dimensional antimonene nanosheets were obtained,with the size distribution of 2.5～3.5μm,uniform thickness and hexagonal shape.The third part is the preparation and characterization of two-dimensional antimonene flexible transparent composite electrodes.Different contents of two-dimensional antimonene solution and silver nanowire solution were mixed to obtain FTCEs by-spin-coating method.The transmittance test showed that the transmittance of FTCEs with two different volume ratios was above 80.0%.The four probe film square resistance test shows that the film resistance of the electrodes made of silver nanowire-antimonene mixed solution with different volume ratios is 165Ωand 50Ω,respectively.FTSCs were prepared with phosphoric acid/PVA as gel electrolyte,and their electrochemical tests were conducted.The air stability of composite electrode was studied by controlling the difference of water content and air content.The fourth part is the performance optimization of two-dimensional antimonene flexible transparent supercapacitor.The ultra-long silver nanowires are used to improve the transmittance and capacitor performance.The transmittance of FTCEs of single two-dimensional antimonene composite ultra-long silver nanowires can reach 87.9%at 550 nm,and the transmittance of FTSCs is 84.6%.Using a new completely symmetrical structure to improve the area capacitance and test stability,the area capacitance of the prepared FTSCs can reach 1.8m F·cm^-2 at the scanning speed of 50 m V/s.FTSCs were prepared by using ruthenium oxide as electrode material and combined with two-dimensional antimonene.FTSCS could maintain99.41%performance after 3000 cycles.