Abstract:
The present work develops a facile ultrasonication method to fabricate hybrid supercapacitor (HSC) positive electrodes based on pristine MgCo2S4 and MgCo2S4/reduced graphene oxide (rGO) composite. The rGO has been synthesized from spent graphite in lithium-ion batteries (LIBs) without any purification process. This inventive work initiates waste utilization to wealth strategies in the area of supercapacitor research, and the presence of rGO boosts the capacitive performance of the fabricated electrode. In this way, economically beneficial and the achievement of closed-loop LIB recycling may be fulfilled with a mitigation of the environmental issues caused by spent LIB components. Morphological analysis establishes the homogenous distribution of MgCo2S4 nanoregime particles on the surface of the rGO framework, and conductive networks are tuned via promotion of the electroactive sites, thereby speeding ionic migrations across the interface. Promisingly, the designed MgCo2S4/rGO composite delivers the specific capacity of 452 Cg-1 (1005 Fg-1) at 1 Ag-1 with excellent rate capability. The HSC device has been fabricated with the use of as-prepared MgCo2S4-based nanostructures. The storage performance of 151 Fg-1 at 1 Ag-1 is marked for composite MgCo2S4/rGO HSC, whereas the pure MgCo2S4 device shows a lower storage value (47 Fg-1). The proposed methodology is a facile and alternate approach to fabricate MgCo2S4/rGO nanostructure, establishing the higher electronic transport in the network as well as promoting redox active sites for faster reactions toward upcoming charge storage applications.
