Mango peel biomass-derive activated carbon and MnCO3 nanocomposite: The potential electrode for high-performance solid-state energy storage

Abstract

Asymmetric supercapacitors are promising energy-storage devices that combine electric double-layer and redox-type electrodes in a single unit. Therefore, the development of sustainable electrodes with high performance and low cost is urgently required. In this study, we prepared activated mango-peel derived carbon (MPC) from bio-waste mango peel (MP) and MnCO₃ nanocomposites using a pyrolysis process. The MnCO₃@MPC electrodes exposed a higher specific capacitance of 1021F g⁻¹ at 0.5 A/g with 98.65 % retention after 10,000 cycles. Moreover, the remarkable supercapacitor performance demonstrated that the proposed electrode possesses a unique morphology and would be a viable option for usage in capacitive energy storage devices. By employing MnCO₃@MPC and activated carbon, two distinct electrochemical potential windows were utilized to create an asymmetric device that showed a higher energy density (23 W h kg⁻¹) at a power density (249 W kg⁻¹). After the stability test, the asymmetric device maintained an outstanding capacity retention rate of 89 %. According to the research findings, MnCO₃@MPC nanocomposites are capable of new electrode-active nanomaterials for use in enhanced electrochemical conversion and storage systems.