Facile in-situ microwave irradiation synthesis of TiO 2/graphene nanocomposite for high-performance supercapacitor applications

摘要

AbstractIn this work, TiO2/graphene nanocomposite was synthesized by facile, surfactant free,in-situmicrowave irradiation method, a quick but also are eco-friendly approach. The structure, morphology, composition and thermal stability of the composites were characterized by using XRD, SEM, FT-IR, Raman spectroscopy, and TGA analyses. XRD result shows the tetragonal anatase phase of pure TiO2, TiO2in the composite and their crystallite size were estimated to be 2.8 and 2nm respectively. The SEM and HR-TEM analyses demonstrate the spherical TiO2nanoparticles intercalated on the graphene sheets. TGA results reveal higher thermal stability of the TiO2/graphene nanocomposite over graphene oxide and TiO2nanoparticles. XPS studies confirm the binding states of the composite structure. The nanocomposites used as the supercapacitor electrode in three electrode system exhibited higher specific capacitance value of 585Fg?1at a current density of 1Ag?1in 1M H2SO4as compared to graphene oxide (174Fg?1) and TiO2electrode (66Fg?1). The enhanced capacitive performance is due to the intercalation of TiO2nanoparticles on the graphene sheet. Thein-situmicrowave irradiation method brings a viable, low-cost and facile synthesis of different metal oxide/graphene based