Polydopamine-assisted NiMoO4 nanorods anchored on graphene as an electrode material for supercapacitor applications

In this study, we modified graphene sheets with polydopamine, used abundant oxygen-containing groups to adsorb metal ions in a hydrothermal process, and obtained graphene-supported NiMoO 4 nanorod composite materials after pyrolysis . NiMoO 4 nanorods were uniformly dispersed on the surface of a reduced graphene oxide layer under strong electrostatic adsorption. The specific capacitance of the composite material measured at a current density of 1 A g −1 was 856 F g −1 (514 C g −1 ), and an asymmetric supercapacitor composed of activated carbon exhibited an energy density of 48 Wh kg −1 at a power density of 800 W kg −1 . After 5000 cycles of charging and discharging, a capacitance retention rate of 73% was achieved. Therefore, PDA-rGO@NiMoO 4 composite materials are promising candidate materials for supercapacitor electrodes.