NiMoO4/reduced graphene oxide composite as an electrode material for hybrid supercapacitor

In this paper, reduced graphene oxide/nickel molybdate (rGO/NiMoO4) nanocomposite was synthesized by a hydrothermal method followed by annealing at 450 degrees C. X-ray diffraction, Raman, and X-ray photoelectron spectroscopy analyses confirmed the formation of rGO/NiMoO4 nanocomposite. Field emission scanning electron microscopy analysis showed that the rod-like NiMoO4 nanostructures with a length of 1-5 mu m were decorated on the rGO surface. In a three-electrode configuration, the rGO/NiMoO4 composite disclosed a capacitance of 680 F g(-1) and maintained 68% of its starting capacitance after 4000 cycles at 3 A g(-1). In the two-electrode configuration, the rGO/NiMoO4 electrode displayed a capacitance of 74 F g(-1) besides an energy density of 26.3 Wh kg(-1) at 0.75 A g(-1) and retained 56.7% of the starting capacitance ensuing 4000 cycles at 1.5 A g(-1). A 9 V hybrid supercapacitor disclosed a capacitance and energy density of 1.09 F g(-1) and 12.3 Wh kg(-1), respectively at 8 mA, and retained 72% of its starting capacitance after 1500 cycles.

Automated summary

The paper successfully synthesized a rGO/NiMoO4 nanocomposite with excellent capacitance performance, especially in maintaining capacitance rate under high cycling numbers.