▎ 摘　　要

Herein, a ternary composite of poly(aniline-co-melamine), graphene oxide (GO), and SnO2, (PMGSn) is synthesized by in-situ oxidative polymerization. The morphology, composition, and structure of the composite were analyzed by Scanning electron microscopy (SEM), Energy dispersive X-ray spectroscopy (EDX), X-ray diffraction (XRD), and Fourier transform infrared (FTIR). The electrochemical studies of PMGSn-1, PMGSn-2, and PMGSn-3 in the three-electrode cell revealed specific capacity values of 172, 126.4, and 90.73 C/g at a scan rate of 3 mV/s, respectively. The supercapattery was fabricated using PMGSn-1 composite-based electrode as the positive and AC as a negative electrode, which displayed an energy density of 23.16 Wh/kg and power density of 695 W/kg at a current density of 1.39 A/g, with capacity retention of 85.3% after 4000 cycles. The synergistic effect among the constituents of PMGSn-1 is credited to its best electrochemical performance compared to its counterpart composites.