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Hydrothermal Synthesis of 3D Petal-like Co<sub>9</sub>S<sub>8</sub>/RGO/Ni<sub>3</sub>S<sub>2</sub> Composite on Nickel Foam for High-Performance Supercapacitors
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Abstract
Co<sub>9</sub>S<sub>8</sub>, Ni<sub>3</sub>S<sub>2</sub>, and reduced graphene
oxide (RGO) were combined to construct a graphene composite with two
mixed metal sulfide components. Co<sub>9</sub>S<sub>8</sub>/RGO/Ni<sub>3</sub>S<sub>2</sub> composite films were hydrothermal-assisted synthesized
on nickel foam (NF) by using a modified “active metal substrate”
route in which nickel foam acted as both a substrate and Ni source
for composite films. It is found that the Co<sub>9</sub>S<sub>8</sub>/RGO/Ni<sub>3</sub>S<sub>2</sub>/NF electrode exhibits superior capacitive
performance with high capability (13.53 F cm<sup>–2</sup> at
20 mA cm<sup>–2</sup>, i.e., 2611.9 F g<sup>–1</sup> at 3.9 A g<sup>–1</sup>), excellent rate capability, and
enhanced electrochemical stability, with 91.7% retention after 1000
continuous charge–discharge cycles even at a high current density
of 80 mA cm<sup>–2</sup>
