Flower‐Like NiCo/rGO Effective Nanocomposite for High‐Performance Supercapacitors

Abstract Novel electrode materials with unique architectures are always favored to improve the capacity and energy density of supercapacitors. Herein, we have designed a composition of transition metal and reduced graphene oxide (rGO) as advanced electrode for enhanced‐performance supercapacitors. Particularly, a facile one‐pot hydrothermal approach was applied for in‐situ growth of NiCo/rGO composite. It displayed the best electrochemical performance attributing to the three‐dimensional flower‐like architecture in combination with conductive rGO. Among all the electrodes, NiCo/rGO exhibited impressive areal capacitance of 2565 mF/cm 2 at a current density of 1 mA/cm 2 , and a high energy density of μWh/cm 2 at a power density of 200 μW/cm 2 . The electrochemical impedance spectroscopy confirms feasible charge transfer kinetics at the interface with small internal resistance and rapid diffusion, resulting an improved electrochemical performance.