We report a facile and green method for the synthesis of Ag@Co/RGO nanocomposite using two reducing agents, L-ascorbic acid (L-AA) and sodium borohydride (NaBH4) at room temperature (RT) and explored the practical application for catalysis reaction. The structure, composition and morphology of the catalyst were characterized by using X-ray diffraction (XRD), vibrating sample magnetometer (VSM), Fourier transform infrared spectroscopy (FTIR), Raman, scanning electron microscopy (SEM), Transmission Electron Microscopy (TEM), X-ray Photoelectron Spectroscopy (XPS) and energy dispersive X-ray spectroscopy (EDX) techniques. Further, the catalytic activity of Ag@Co/RGO nanocomposites was investigated for hydrogenation of p-nitrophenol (4-NP) to p-aminophenol (4-AP) and it showed a remarkable high activity 45 s at RT with excellent stability up to 5 cycles. Copyright (C) 2015, Hydrogen Energy Publications, LLC. Published by Elsevier Ltd. All rights reserved.