Green Hydrothermal Synthesis of Ag@Ag2O@GO Nanocomposites Using Diospyros Kaki Fruit Extract and Their Application in Supercapacitors

Increasing global energy demand and environmental concerns have heightened interest in supercapacitors offering high power density and long cycle life. In this context, the synergistic effect of graphene oxide (GO) and silver nanoparticles (AgNPs) plays a significant role in the development of electrode materials. In this study, an eco-friendly Ag@Ag ₂ O@GO nanocomposite was successfully synthesized via a one-step hydrothermal method using Diospyros kaki ( D. kaki) fruit extract as a reducing and stabilizing agent. The structural and morphological properties of the synthesized nanocomposite were characterized in detail using FTIR, UV-VIS, XRD, SEM-EDX, and TEM analyses. The electrochemical performance of the material as a supercapacitor electrode was evaluated using the CV technique. The obtained results demonstrate a significant specific capacitance of 125.5 F g ^− 1 for the Ag@Ag ₂ O@GO nanocomposite compared to 58.3 F g ^− 1 for pure GO, revealing that this structure, synthesized with plant extract, is a potential candidate for advanced energy storage applications.