Hydrothermal synthesis of carbon- and reduced graphene oxide-supported CoMoO₄ nanorods for supercapacitor

Hybrid CoMoO₄ nanorods with carbon (C) and graphene oxide (rGO) are successfully synthesized via one-step hydrothermal process. Hybrid α-CoMoO₄ nanorods have shown excellent electrochemical performances compared to pristine CoMoO₄ in alkaline electrolyte. Specifically, CoMoO₄/C nanorod exhibits a maximum specific capacitance of 451.6 F g^-1 at the current density of 1 A g^-1, whereas CoMoO₄/rGO shows high specific capacitance of 336.1 F g^-1 at the same current density. Both the hybrid nanorods show good rate capability even at high current density of 20 A g^-1 and long-term cyclic stability. The observed electrochemical features of the hybrid CoMoO₄ nanostructure could be attributed to the presence of highly conductive carbonaceous material on unique one-dimensional nanorod microstructure which enhances the electrical conductivity of the nanorods thereby allowing faster electrolyte ion diffusion during the redox process.