Electrochemical performance of rGO anchored with inorganic halide perovskite LiZrBr3 composite for effective supercapacitor electrodes

Abstract

Exploring prospective materials to develop efficient and durable supercapacitor electrode becomes a key challenge for researchers. For this, halide perovskite gained considerable attention in diverse fields because of their flexible chemistry and outstanding ionic conductivity. However, their use for energy storage found limited. In this perspective, halide perovskite (LiZrBr₃)-based composites with rGO were synthesized by solid-state reaction method, aimed to fabricate advanced supercapacitor electrodes with enhanced supercapacitive performance. The physico-chemical properties were thoroughly characterized using techniques including XRD, FE-SEM, EDX, CV, GCD, and EIS. XRD confirmed the phase purity. FE-SEM coupled with EDX confirmed the incorporation of rGO in halide perovskite with porous type morphology along with the presence of the constituent elements Li, Zr, Br, and C. BET confirmed the mesoporous structure. From electrochemical analysis, CV showed pseudocapacitive character of the electrode. The high specific capacitance (1328.5 F/g), power density 340.4 W/Kg), and energy density (59.1 Wh/Kg) in case of composite were achieved with an exemplary cyclic performance of 91.2% over 3000th charging-discharging cycles, as compared to pure at current density of 0.5 A/g. EIS analysis further supported these findings, as the Nyquist plot showed a small semicircle, indicating low charge transfer resistance for the LiZrBr₃/rGO composite. The observed results proposed that halide perovskite composites (LiZrBr₃/rGO) hold great promise for advancing next-generation energy storage devices as supercapacitor electrodes.