▎ 摘　　要

The formation of silver-decorated nanocomposite based on reduced graphene oxide has been carried out in a single step by using leaf extract of Azadirachta indica as a reducing agent. Various analytical techniques have been employed for exploring the properties of the synthesized Ag/rGO nanocomposite. XRD studies confirmed the cubic structure with a crystallinity of 70.3%. The FESEM and EDX analysis revealed that AgNPs having particle sizes in the range of 68-95 nm are symmetrically decorated on the rGO surface. The UV-Vis spectroscopy also confirmed the successful formation of AgNPs and reduction of GO into rGO with a tunable energy bandgap of 2.27 eV in Ag/rGO nanocomposite. The presence of various phytochemicals in the leaf extract, responsible for the in-situ formation of AgNPs and reduction of GO into rGO, has been confirmed through FTIR analysis. Furthermore, the electrochemical performance investigations of synthesized rGO and Ag/rGO nanocomposite as an electrode showed a maximum specific capacitance of 206 Fg(-1) and 349 Fg(-1) at 1 Ag-1 current density, respectively with outstanding long-cycle stability of 88.0% after 4000 cycles. It is expected that the present investigations of synthesized Ag/rGO nanocomposite may help to understand its behavior as an electrode material for device applications.