Significant Electrode of Supercapattery Devices: the Induced Charge Storage Capability of MoSe₂/rGO Nanosheets Bedecked by MnO₂ Nanorod Composites

This work emphasizes the procedure with three stages, including a forthright hydrothermal technique for synthesizing a composite material of layered MoSe₂/rGO and MnO₂ nanorods. The developed electrodes explicitly show the supercapacitor and battery storage capability (i.e., supercapattery), unveiling a higher operating potential value and energy density. This is mainly attributed to the structure and high surface-to-volume ratio of 2D MoSe₂/rGO nanosheets, which provide rapid charge storage aptitudes, enormous active sites, decreased electronic/ionic resistance, and rich electron transfer characteristics. The MnO₂/MoSe₂/rGO composite has an optimum surface area (78.24 m² g^-1) and an immense microspore structure (12.9 nm), which is due to the layered construction of MoSe₂ with rGO nanosheets. The MnO₂/MoSe₂/rGO composite has robust electrochemical characteristics, achieving 950 F g^-1 of specific capacitance at 1 A g^-1 of current density and demonstrating cyclic stability of 90% after 10,000 continuous cycles. In addition, an asymmetric supercapattery device of AC//MnO₂/MoSe₂/rGO showcased the specific capacitance and capacity of 85.1 F g^-1 and 153.18 C g^-1 at 1 A g^-1, as well as achieved an energy and power density of 30.2 W h/kg and 807 W/kg in 1.8 V. Also, a real-time practical device is tested using two distinct varieties of light-emitting diodes and offered with an effective discharge time of 14 min. The enriched electrochemical performances of MnO₂/MoSe₂/rGO composites and the extensive features of supercapattery electrodes may have potential for the expanded charge storage realm in modern energy storage materials.