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Abstract
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 NiMoO4/3D-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 NiMoO4/3D-rGO nanocomposite with porous structure. The X-ray diffraction pattern of the NiMoO4 nano particles indicated a monoclinic structure. Also, the scanning electron microscope observation showed that the NiMoO4 NPs were dispersed across the rGO sheets. The electrochemical results of the NiMoO4/3D-rGO electrode revealed that the incorporation of rGO sheets with NiMoO4 NPs increased the capacity of the nanocomposite. Therefore, a significant increase in the specific capacity of the electrode was observed with the NiMoO4/3D-rGO nanocomposite (450 Cg−1 or 900 Fg−1) when compared with bare NiMoO4 nanoparticles (350 Cg−1 or 700 Fg−1) at the current density of 1 A g−1. Our findings show that the incorporation of rGO and NiMoO4 NP redox reactions with a porous structure can benefit the future development of supercapacitors.
Highlights
Green energy plays a key role in the development of modern human life and the advancement of new technologies
Ni(NO3 )2 ·6H2 O was first added to the mixed solution of starch/graphene oxide (GO), and after 10 min of stirring through a magnetic stirrer, 50-mM Na2 MoO4 ·2H2 O was added to the above solution with continued stirring for 1 h at the temperature of 80 ◦ C
A NiMoO4 /3D-reduced graphene oxide (rGO) nanocomposite was prepared with a simple and effective precipitation method in starch media. This technique is useful for synthesizing a large amount of NiMoO4 /3D-rGO
Summary
Green energy plays a key role in the development of modern human life and the advancement of new technologies. Transition metal oxides and hydroxides, such as NiO [4], Ni(OH)2 [5,6,7], MnO2 [8,9], MoO3 [10], and Co3 O4 [11], are mostly employed as the supercapacitors material These types of electrode materials are low cost and naturally abundant, with significant specific capacity based on redox reactions and high electrochemical activity [12]. We propose a facile and an efficient method to synthesize a new three-dimensional hybrid structure, combining NiMoO4 NPs and rGO This method can produce large amounts of material with less equipment and low temperatures compared to other techniques. The porous structure provides a rapid ion diffusion path and increases the capacity
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