Facile syntheses of Fe2O3-rGO and NiCo-LDH-rGO nanocomposites for high-performance electrochemical capacitors

Faraday-type electrode materials and devices for electrochemical capacitors have been widely investi-gated. However, their applications are severely limited by the preparation method and cost of electrode materials. In this work, high-performance electrochemical capacitors were successfully assembled using Fe2O3-decorated reduced graphene oxide (rGO) nanocomposites and NiCo-Layered Double Hydroxides (LDH) as the anode and cathode, respectively. An easy and efficient approach (the modified precipitation method) for the large-scale fabrication was used to prepare Fe2O3 and NiCo-LDH, supported by rGO sheets, respectively. The anode material, Fe2O3-rGO, exhibited an excellent specific capacitance (Csp) of 1073 F g(-1) at a current density of 1 A g(-1) and a retention rate of 92 % at 10 A g(-1), while the NiCo-LDH-rGO cathode material provided a Csp of 1850 F g(-1) at 1 A g(-1) and maintained 84 % at 10 A g(-1). The effective combination of these electrodes for the NiCo-LDH-rGO//Fe2O3-rGO electrochemical capac-itors resulted in an excellent energy density of 108 Wh/kg at a power density of 884 W/kg, with remark-able cycling stability (80 % after 1000 cycles at 10 A g(-1)). We believe that this work, including the proposed method and electrode materials, will advance the further development and commercialization of electrochemical capacitors. (c) 2022 Elsevier Inc. All rights reserved.