One Step Hydrothermal Synthesis of Flower-shaped Co₃O₄ Nanorods on Nickel Foam as Supercapacitor Materials and Their Excellent Electrochemical Performance

Abstract

Flower-shaped Co₃O₄ nanorods directly grown on nickel foam(Co₃O₄/NF) were prepared by one step hydrothermal method at low temperature. Co₃O₄ nanorods are directly connected with the nickel foam, and no binder is needed as an additive, so the Co₃O₄/NF electrode has good electrical conductivity. This flower-shaped structure makes larger surface area of Co₃O₄ nanorods that exposes to the electrolyte, thus promoting the redox reaction. The Co₃O₄/NF electrode shows a high specific capacitance of 2005.34 F/g at the current density of 0.5 A/g and a high capacitance retention of 98.0% after 5000 cycles. The high superior capacitive performance with high specific capacitance and the excellent cyclic performance indicate that the one step hydrothermal method has great potential application in supercapacitors.

Keywords

Supercapacitor / Co₃O₄/NF / Hydrothermal / Nanorod

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