| Summary: | This paper presents research on the synergistic effects of nickel molybdate and reduced graphene oxide as a nanocomposite for further development of energy storage systems. An enhancement in the electrochemical performance of supercapacitor electrodes occurs by synthesizing highly porous structures and achieving more surface area. In this work, a chemical precipitation technique was used to synthesize the NiMoO<sub>4</sub>/3D-rGO nanocomposite in a starch media. Starch was used to develop the porosities of the nanostructure. A temperature of 350 °C was applied to transform graphene oxide sheets to reduced graphene oxide and remove the starch to obtain the NiMoO<sub>4</sub>/3D-rGO nanocomposite with porous structure. The X-ray diffraction pattern of the NiMoO<sub>4</sub> nano particles indicated a monoclinic structure. Also, the scanning electron microscope observation showed that the NiMoO<sub>4</sub> NPs were dispersed across the rGO sheets. The electrochemical results of the NiMoO<sub>4</sub>/3D-rGO electrode revealed that the incorporation of rGO sheets with NiMoO<sub>4</sub> NPs increased the capacity of the nanocomposite. Therefore, a significant increase in the specific capacity of the electrode was observed with the NiMoO<sub>4</sub>/3D-rGO nanocomposite (450 Cg<sup>−1</sup> or 900 Fg<sup>−1</sup>) when compared with bare NiMoO<sub>4</sub> nanoparticles (350 Cg<sup>−1</sup> or 700 Fg<sup>−1</sup>) at the current density of 1 A g<sup>−1</sup>. Our findings show that the incorporation of rGO and NiMoO<sub>4</sub> NP redox reactions with a porous structure can benefit the future development of supercapacitors.
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