Fe2O3/N doped rGO anode hybridized with NiCo LDH/Co(OH)(2) cathode for battery-like supercapacitor

In this work, a high-performance hybrid supercapacitor is assembled with N-doped reduced graphene oxide (N-rGO) decorated with Fe2O3 (Fe2O3/N-rGO) as the anode, and NiCo layered double hydroxide integrated with conductive Co(OH)(2) (NiCo LDH/Co(OH)2) as the cathode. The two main pseudo-capacitive materials are modified by different materials (N-rGO and Co(OH)(2)) to enhance the conductivity. For anode, the Fe2O3 nanoparticles are uniformly dispersed on N-rGO via a facile solvent-thermal method. The highly conductive Fe2O3/N-rGO exhibits a superior capacitance of 912.9F/g at 1 A/g and retains 84% at 30 A/g. The NiCo LDH/Co(OH)(2) cathode also synthesized by a convenient solvent-thermal method delivers a high specific capacitance of 2220.0F/g at 1 A/g and retains 70% at a high current density of 50 A/g. Utilizing these electrodes, we successfully fabricate a hybrid battery-like supercapacitor with an excellent energy density of 103.3 Wh/kg at an outstanding power density of 790 W/kg, an excellent capacitance of 296.3F/g at 1 A/g and a remarkable cyclic stability with 92% retention after 1000 cycles at 10 A/g. Due to the elaborately designed electrode materials, the battery-like supercapacitor exhibits excellent electrochemical properties and is an inspiration for future energy storage devices.

Automated summary

This study successfully assembles a high-performance hybrid supercapacitor with N-doped reduced graphene oxide (N-rGO) decorated with Fe2O3 as the anode, and NiCo layered double hydroxide integrated with conductive Co(OH)2 as the cathode. The resulting supercapacitor exhibits excellent energy density, power density, capacitance, and cyclic stability, making it a promising candidate for future energy storage devices.