▎ 摘　　要

A ternary nanocomposite of three-dimensional graphene-silver nanoparticles-polyaniline (3DG-nAg-PANi) is prepared via an in-situ polymerization technique. The structural and morphological characterizations through Xray diffraction, Fourier transform infrared, Raman spectroscopy and Field emission scanning electron microscopy confirmed the high purity 3DG-nAg-PANi nanocomposite. The prepared 3DG-nAg-PANi nanocomposite is used as a positive electrode with activated carbon as a negative electrode to fabricated asymmetric supercapacitor (ASC). The electrochemical performance studies revealed the outstanding performance of 3DG-nAg-PANi nanocomposite compared to its counterparts (3DG, PANi and 3DG-PANi). The maximum specific capacity is found for 3DG-nAg-PANi ternary nanocomposite (115.6 C g-1) compared with 3DG (71.6 C g-1), PANi (32.2 C g-1), and 3DG-PANi nanocomposite (47.2 C g-1), at a current density of 1 A g-1 in the standard three-electrode cell. The assembled ASC delivered maximum specific energy of 11.67 Wh kg-1 at a specific power of 300 Wkg- 1 using 0.4 A g-1 of current density. The ASC is able to retain 92% of initial capacity after 5000 cycles at a current density of 2 A g-1. The electrochemical performance of the 3DG-nAg-PANi ternary nanocomposite reveals that it is a suitable candidate for electrodes in the energy storage systems.