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Preparation and performance of carbon dot stabilized copper sulphide/carbon nanotubes hybrid composite as super capacitor electrode materials

Tingkai Zhao and Xin Zhao

Carbon dot stabilized copper sulphide/carbon nanotube
(CD@CuS/CNT) hybrid composite was synthesized by a
simple one-pot hydrothermal reaction at 180℃ using copper sulphate and sodium thiosulphate as Cu and S sources. The
microstructures and morphologies of hybrid composites were
characterized by X-ray diffraction (XRD), Raman spectroscopy (Raman), scanning electron microscope (SEM) and transmission electron microscope (TEM). Moreover, a highperformance asymmetric supercapacitor device was assembled to improve the electrochemical performance of CuS as well as carbon based supercapacitors1. The CD@CuS/CNT hybrid composite exhibited a maximum specific capacitance of 736.1F•g-1 at the current density of 1A•g-1. Furthermore, the
CD@CuS/CNT hybrid composite showed good cycling stability with more than 92% capacitance retention after 5000 cycles. These excellent results suggested that CD@CuS/CNT hybrid composite has promising application potential for supercapacitors2.