Controlable Preparation Of MoS₂-based Nanocomposing Materials And Its Electrochemical Energy Storage

Supercapacitor is a new type of energy storage device between batteries and traditional capacitors.It has the advantages of traditional supercapacitors and secondary batteries.The electrode materials of supercapacitors have strong research value.In recent years,transition metal sulfides have attracted widespread attention due to the high energy density and good rate performance,and have become a research focus.This paper takes a typical transition metal of sulfide-molybdenum disulfide as the research object to study the preparation methods of different morphology MoS₂/PANI composite materials,different morphology MoS₂/C composite materials and nitrogen-doped MoS₂/C composite materials.Electrochemical testing,electrical conductivity and structural stability evaluate its comprehensive performance,explore the working principle of the new material supercapacitor,and systematically study the influence law and mechanism of different materials on the charging and discharging process of supercapacitors.The specific research content is as follows:(1)Based on the hydrothermal synthesis of MoS₂ with different morphologies,the in-situ composite method was used to load PANI to prepare MoS₂/PANI supercapacitor composite materials with different morphologies.Through the characterization and analysis of the composition,structure and morphology,it is ensured that the synthesized MoS₂ and MoS₂/PANI electrode materials with different morphologies meet the requirements.Then electrochemical performance characterization was carried out.The results show that loading PANI can effectively improve the electrochemical performance of molybdenum disulfide,and the porous hollow meshy structure has higher specific capacitance and better cycle stability than the flower-like structure.(2)Using the St(?)ber method,TEOS and TPOS were used as different silicon sources to prepare hollow mesoporous carbon spheres.After comparing the experimental results,the electrode material prepared by TP-HMCS was finally selected for in-depth study.The flower-like C-MoS₂ and egg-yolk shell-like MoS₂@C nanomaterials are prepared by hydrothermal method as supercapacitor electrode materials,and the phase composition and microscopic shape of the prepared materials are analyzed by SEM,TEM,XRD,BET,XPS and electrochemical methods.Appearance,electrochemical performance,etc.The results show that the MoS₂@C electrode material in which MoS₂ is restricted to form a yellow shell-like structure in HMCS has the best electrochemical performance.(3)Nitrogen-doped hollow mesoporous carbon spheres were prepared by heteroatom doping,and the composition,morphology and structure of the materials were analyzed by SEM,TEM,XRD,BET,XPS and other material characterization methods,and the electrochemistry of the materials before and after doping was compared.It can be found that N-C-MoS₂ and N-MoS₂@C doped with nitrogen have a certain improvement in specific capacitance compared with C-MoS₂ and MoS₂@C,and the cycle stability is better.The results prove that the yolk shell-like N-MoS₂@C has the best electrochemical performance.