Synthesis of CoMoO₄@RGO nanocomposites as high-performance supercapacitor electrodes

Pure CoMoO₄nanoplate arrays grew on nickel foam by one-step hydrothermal process, while flower-like nanoflake CoMoO₄@RGO nanocomposites grew on nickel foam. Flower-like nanoflake CoMoO₄@RGO nanocomposites electrode exhibited higher capacitance than pure CoMoO₄nanoplate arrays electrode. Maximum specific capacitance of 856.2 F g⁻¹was obtained at current density of 1 A g⁻¹for CoMoO₄@RGO nanocomposites electrode. In addition, after 2000 cycles of continuous galvanostatic charge–discharge cycles, only 5.5% degradation of specific capacitance was found for CoMoO₄@RGO nanocomposites. CoMoO₄@RGO nanocomposites exhibited lower electrochemical resistance than pure-CoMoO₄. This was because that the former had larger specific surface area and average pore diameter than the latter. The flower-like nanoflake CoMoO₄facilitated electrolyte movement during charge or discharge process and provided more active sites for the electrochemical reactions. In addition, the synergetic effect between RGO and CoMoO₄also improved the supercapacitor performance.