The formation of silver-decorated nanocomposite primarily based on lowered graphene oxide has been carried out in a single step by utilizing leaf extract of Azadirachta indica as a decreasing agent. Numerous analytical methods have been employed for exploring the properties of the synthesized Ag/rGO nanocomposite. XRD research confirmed the cubic construction with a crystallinity of 70.3%. The FESEM and EDX evaluation revealed that AgNPs having particle sizes within the vary of 68–95 nm are symmetrically adorned on the rGO floor. The UV-Vis spectroscopy additionally confirmed the profitable formation of AgNPs and discount of GO into rGO with a tunable vitality bandgap of two.27 eV in Ag/rGO nanocomposite. The presence of varied phytochemicals within the leaf extract, liable for the in-situ formation of AgNPs and discount of GO into rGO, has been confirmed by means of FTIR evaluation. Moreover, the electrochemical efficiency investigations of synthesized rGO and Ag/rGO nanocomposite as an electrode confirmed a most particular capacitance of 206 Fg−1 and 349 Fg−1 at 1 Ag−1 present density, respectively with excellent long-cycle stability of 88.0% after 4000 cycles. It’s anticipated that the current investigations of synthesized Ag/rGO nanocomposite could assist to grasp its conduct as an electrode materials for machine purposes.