Synergistic effect of CdS/GO nanocomposite for enhanced electrochemical performance in symmetric supercapacitor

Abstract Metal sulfides and graphene oxide nanocomposites have recently has garnered considerable attention in the field of electrochemical energy storage devices. In this study, we synthesized a cadmium sulfide/graphene oxide (CdS/GO) nanocomposite using different contents of graphene oxide (0.01, 0.02, 0.03 and 0.04 g) with fixed concentartion of CdS (0.3 g) via Solid-State Reaction (SSR) method. CdS/GO composite were subsequently investigated to be used as electrode materials for supercapacitors. Notably, the optimized electrode CdS/GO-0.04 electrode demonstrated superior capacitive performance compare to individual CdS and their composites with GO. In a symmetric supercapacitor configuration, the CdS/GO-0.04 cathode demonstrated a specific capacitance of 211.5 F g−1 at a scan rate of 1.5 A g−1 and maintained 93% of its capacitance after 1,000 cycles at a current density of 5 A g−1, indicating excellent cycling stability. The significantly improved capacitive performance of CdS/GO-0.04 can be primarily attributed to the synergistic interaction between CdS and GO particles, enhanced conductivity, and the relatively larger surface area of the composites. These findings suggest that CdS/GO nanocomposites hold great promise as electrode materials for high-performance energy storage applications.