Research On The Photoelectric Properties Of Antimony Sulfide And Its Application In Energy Storage

Supercapacitor is a potential energy storage device.Recently,metal sulfide has attracted much attention as the electrode material of supercapacitor due to its special layered lattice structure.As a semiconductor,this kind of material has low electronic conductivity,but its conductive characteristics are closely related to its doping or defect concentration and light-induced state.Thus there is a lot of room for its conductivity to improve.At present,there is almost no research exploring the relationship between these optoelectronic behaviors of semiconductors and their performance as supercapacitor materials.Therefore,in this paper,the electrochemical deposition is applied to prepare the thin Sb₂S₃ film.And “PVP Guides Nanostructure Growth” and “the Compound of PANI and Sb₂S₃” are carried out to improve the conductivity of Sb₂S₃.By comparing the optical and electrochemical properties of different samples,the possibility of their application in the supercapacitor,especially in the micro-supercapacitors,is analyzed.According to the study,the amount of HCl has an important influence on the film formation of Sb₂S₃ on ITO.When the content of HCl is 5 mL,the p H of the deposition solution is 0.6 ? 0.7.At this time,the Sb₂S₃ film has the best performance and the diameter of the Sb₂S₃ nanoparticles is also the finest.Moreover,the new nanostructures generated by PVP play an important role in improving the electrical properties of Sb₂S₃.So how the amount of PVP effect the electrochemical performance of Sb₂S₃ has been researched,and its interaction with the deposition potential is studied meanwhile.The results show that the Sb₂S₃ thin film obtained under the conditions of 0.04 g PVP and-0.85 V has the best performance.This is due to its microscopic morphology of ‘pompon' mixed with the whisker-like needle,which provides a large specific surface area and high porosity.So this film can achieve a specific capacitance of 24.88 F/cm³ at 0.2 A/cm³.And this value has increased significantly under illumination due to the effect of photogenerated charge.Considering that the special structure generated by PVP is easy to be damaged during charging and discharging,the PANI film is deposited on Sb₂S₃ in order to dissolve this problem.It is found that the Sb₂S₃@PANI film obtained after 7 cycles at 50 m V/s has the best electrochemical performance.Its potential window is from-0.2 to 0.6 V,which is opposite to that of the pure Sb₂S₃.At 0.1 A/cm³,its specific capacitance is 125.07 F/cm³.In addition,the rate and cycle performance of this composite film are also significantly improved compared to the single Sb₂S₃ film.This is attributed to the synergistic effect of the porous PANI network and the ‘pompon' like Sb₂S₃ particles,which promotes ion transport and charge diffusion and also enhances the mechanical stability of the film.The energy density of the double electrode system with Sb₂S₃ as the cathode and Sb₂S₃@PANI-7c as the anode can reach 2.22×10^-3 Wh/cm³ when the power density is 0.079 W/cm³.Additionally,because the energy level of PANI and Sb₂S₃ are well matched,under both positive and negative potential,there is a significant increase in specific capacitance of the film when it is illuminated.