In this paper, a three-dimensional (3D) network Ag/MnO 2 /GO/PPy nanocomposite with adjustable micro-mesoporosity was synthesized by effectively controlling the amount of added pyrrole (Py). The Ag/MnO 2 /GO/PPy-5 nanocomposite exhibits excellent specific capacitance (C = 474.3 F g −1 , 5 mV s −1 ) and high cycle stability (up to 105.3% efficiency after 10,000 charge/discharge cycles). The appropriate micro-mesoporous structure of the 3D graphene-based nanocomposite provides a low-resistance path and a shorter diffusion path for ions, remarkably improving the electrochemical performance of Ag/ MnO 2 /GO/PPy-5 by combining the advantages of these materials. Moreover, the 3D porous structure has strong stability, and evenly dispersed MnO 2 and symbiose Ag nanoparticles can afford additional active sites and high conductivity for the nanocomposites.

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