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Abstract
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In the past decade, enormous attempts have been made to modify the effective electrode materials for the construction of supercapacitors. Here, we report a cost-effective, simple, and one-pot hydrothermal technique to fabricate a new nanocomposite based on nitrogen-doped graphene oxide (NGO) nanosheets twisted with copper ferrite nanoparticles (CuFe2O4 NPs) as a new supercapacitor material with outstanding performance. A concurrent synthetic route takes advantage of the synergetic impact caused by the high pseudo-capacitance of CuFe2O4 and the superior electrical conductivity of NGO, resulting in a larger performance improvement of the nanocomposite than that of blank CuFe2O4. The as-prepared NGO/ CuFe2O4 electrode significantly shows an excellent specific capacitance of 348 F/g at 1 A/g current density with superior cycling stability, saving 87% of its first capacitance over 2000 GCD cycles. The electrochemical analysis revealed that the NGO provides a continuous conductive pathway for electron/ion transport and a large surface area and alleviates the significant strain resulting from the volume expansion of CuFe2O4. Furthermore, an asymmetrical supercapacitor is produced by NGO/CuFe2O4 as the positive electrode and activated carbon as the negative electrode, which shows superior electrochemical performance, producing a high energy density (35.79 Wh/kg) and a high-power density (883.09 W/kg) with excellent cycling stability. This article aims to provide a rapid and scalable hydrothermal approach for synthesizing NGO/CuFe2O4 nanocomposites with increased electrochemical efficiency for supercapacitor applications.
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