▎ 摘　　要

The present work describes the deposition of coppersulfide (Cu2S) nanoflakes onto reduced graphene oxide (rGO) on three dimensional (3D) nickel foam byinexpensive chemical methods. The nanohybrid structure exhibited excellent surface area (41.67 m(2) g(-1)) with a porous structure (pore size 22.8 nm) and good electrical conductivity with a maximum specific capacitance of 1264 F g(-1) at a scan rate of 5 mV s(-1). The Cu2S@rGO composite exhibits a significantly higher specific capacitance. The nanohybrid structure showed outstanding cycling stability of 94 % after 10000 cycles. The asymmetric supercapacitor (ASC) device, Cu2S@rGO//rGO exhibited a maximum specific capacitance of 135 F g(-1) with high energy and power densities of 50 Wh kg(-1), and 7000 W kg(-1), respectively. (C) 2021 The Korean Society of Industrial and Engineering Chemistry. Published by Elsevier B.V. All rights reserved.