Enhanced electrochemical performance of CoMoO4 nanorods/reduced graphene oxide (rGO) as asymmetric supercapacitor devices

The efficiency of a supercapacitor depends heavily on the materials used to create its electrodes. Physicochemical properties have piqued interest in using transition metal molybdates as electrode materials in supercapacitors . Monodisperse CoMoO 4 nanorods with a modest dimension (about 40–60 nm in width and 1.5–2 μm in length) were created on reduced graphene oxide (rGO) nanosheets were synthesized via a facile hydrothermal method . Hybrid CoMoO 4 @rGO electrodes have shown exceptional electrochemical properties, especially when compared to pure CoMoO 4 in an alkaline electrolyte . In particular, the maximum specific capacitance of CoMoO 4 @rGO is 1425 Fg −1 at a current density of 1Ag −1 , while the greatest specific capacitance of CoMoO 4 is 751 Fg −1 at the same current density. Both the pure and hybrid electrodes show excellent rate capability and long-term cyclic stability, even at high current densities of 20 Ag −1 . Also, at a current density of 20 Ag −1 , the constructed asymmetric supercapacitor generated a maximum power density of 4.5 kWkg −1 , and at a current density of 1 Ag −1 , it generated a high energy density of 51.2 Whkg −1 . Based on their promising electrochemical performance, the hierarchical CoMoO 4 @rGO nanocomposites were discovered to provide for a promising electrode material in the creation of highly effective supercapacitors for power storage.