Successful Anchoring of Activated Carbon (AC) and Fullerene (C60) on Halide Perovskite CsEuBr₃ for Effective Energy Storage as Supercapacitor Electrodes

Inorganic halide perovskites deemed efficient for durable energy storage, has driven intensive research focus due to superior ionic conductivity and flexible chemistry. In this study, halide perovskite CsEuBr₃, composites with fullerene (C60) (CsEuBr₃/C60) and activated carbon (AC) (CsEuBr₃/AC) were successfully synthesized for the first time via facile hydrothermal approach. After synthesis, structural, morphological, and electrochemical properties were carried out using advance characterization tools. XRD revealed well-defined orthorhombic phase, whereas FE-SEM showed porous texture, with effectual anchoring of CsEuBr₃ particles with the fullerene (C60) and activated carbon (AC). Elemental composition (Cs, Eu, Br, and C) was identified through EDX. BET showed distinct mesoporous texture, with the activated carbon (AC)-based composite exhibit superior porosity and large surface area. From electrochemical evaluation, CV stated the pseudocapacitive character of all electrodes. GCD demonstrated the remarkable performance of CsEuBr₃/AC, With specific capacitance of 1530.3 F/g, power density of 1850.6 W/kg, and energy density of 63.4 Wh/kg. Also, composite retained 94.8% stability after 3000th cycles at 0.1 A/g. EIS distinctly revealed decrement in charge transfer resistance (Rct), as evidenced by the minimal arc observed in the Nyquist plot. These findings underpin the feasibility of halide perovskite composites as highly efficient and durable materials for energy storage, specifically in the domain of supercapacitors.