Polyaniline-SrTiO3 nanocube based binary nanocomposite as highly stable electrode material for high performance supercapaterry

The current study demonstrates the simplistic approach for the synthesis of SrTiO₃ nanocubes incorporated polyaniline flakes (PANI-SrTiO₃) by facile in-situ oxidative polymerisation route. The synthesised nanocomposites were characterised by various spectroscopic and surface analysis techniques viz. X-ray diffraction (XRD), field emission scanning electron microscopy (FESEM), Fourier transform infrared spectroscopy (FTIR), transmission electron microscopy (TEM), thermogravimetric analysis (TGA), and Brunauer-Emmett-Teller analysis (BET). The electrochemical performance of the prepared nanocomposites for energy storage application was evaluated by electrochemical impedance spectroscopy (EIS), galvanostatic charge-discharge (GCD) and cyclic voltammetry (CV) in 1?M of KOH as an electrolyte. The electrochemical investigations demonstrate that the performance of the PANI-SrTiO₃ nanocomposite in terms of rate capability was significantly higher as compared to the polyaniline flakes and SrTiO₃ nanocubes. Supercapattery was fabricated by combining activated carbon and PANI-SrTiO₃-250 as negative and positive electrodes respectively in order to evaluate complete device performance. It is found that fabricated supercapattery gave an energy density of 13.2?W?h/kg at a power density of 299?W/kg. Additionally, the fabricated supercapattery also offered excellent stability cycle with 114% capacity retention after 4000 cycles. Moreover, the performance of PANI-SrTiO₃-250 was found to be better than the other compositions.