Synthesis of Halide Perovskites Binary Composites with rGO and PANI for High-Performance Supercapacitor Electrodes.

Halide perovskites with carboneous materials put magical foundation for energy concern, specifically for supercapacitor electrodes, because of their flexible chemistry and high electronic/ionic conductivity. Here, the inorganic halide perovskite composites with rGO and PANI, i.e.; (KNiBr3, KNiBr3/rGO, and KNiBr3/PANI) were synthesize by employing facile hydrothermal approach. The physio-chemical characteristics of these composites were investigated in detail by using various advance characterization tools, including XRD, FE-SEM, EDX, I-V, CV, GCD, and EIS, respectively. XRD confirmed the phase purity and high crystallinity. Whereas FE-SEM attached with EDX, revealed the porous nature and confirmed the presence of the desired elements. I-V measurements represents the ohmic behavior, resulting to higher conductivity. In electrochemical measurements, CV confirmed the pesudocapacitive behavior of all the fabricated electrodes. GCD analysis showed that the electrode incorporated with PANI exhibited superior specific capacitance (944.25 F/g), power density (1374.31 W/kg), and energy density (79.087 Wh/kg) at 1 A/g. EIS confirmed that KNiBr3/PANI electrode showed small semi-circle, indicating the small polarization and solution resistance, support the FE-SEM and I-V analysis. In addition, stability test was performed over 3000th charging/discharging cycles at 5 mV/s, indicate that PANI-based electrode retained 94% of original capacitance. Based on these findings, it is confidently suggested that studied halide perovskite materials can be effectively used for next generation supercapacitor electrodes. [ABSTRACT FROM AUTHOR]