Synthesis of polythi̇ophene based nanocomposite materials, electrochemical behaviors and supercapacitor applications

Electrochemical energy sterage systems (battery, supercapacitors and fuel cells) are used in many fields from wearable electronic devices to electric vehicles and many other areas. Supercapacitors are very important in terms of high change density, cylics stabilitiy and fast charging/discharging characteristics. In this thesis, different nanomaterials, such as titanium dioxide (TiO₂), Molybedum disulfide (MoS₂) and Iron (III) oxide ( Fe₂O₃) and reduced graphane oxide (rGO) and their nanocomposites with different amounts and ratios of Polythiopehene (PTh) were characterized by FTIR-ATR, SEM-EDX, Solid conductivity, TGA-DTA, BET surface analysis, etc. In addition, it includes supercapacitor device fabrication and electrochemical performance tests. At the last stage, experimantal and theoretical data were compered by simulating [RS(C1(R1(R2C2)))] equivalent circuit model, which were evaluated by ZSimpWin 3.22 programme. Equivalent circuit parametres have been determired by EIS data. In this thesis, starting from graphite, TiO₂/GO/PTh, TiO₂/rGO/PTh, TiO₂/rGO/PTh/KS, MoS₂/GO/PTh, MoS₂/ rGO/PTh, MoS₂/ rGO/PTh/KS, Fe₂O₃/GO/PTh, Fe₂O₃/rGO/PTh, Fe₂O₃/rGO/PTh/KS were fabricated by 2 electrode supercapacitor device. The highest spesific kapasitance was obtained as Csp= 1588,72 F×g-1 by CV method at 2 mV×s-1 for MoS₂/rGO/PTh nanocomposite. Spesific capacitance (Csp), energy (E) and power density (P) and stability tests (1000 cycles) were performed to obtain capacitance protection during charging and discharging process. As a result, PTh based supercapacitor electrode materials were developed with cheaper and pratical methods tested on supercapacitor.