Journal
JOURNAL OF ALLOYS AND COMPOUNDS
Volume 817, Issue -, Pages -Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2019.153057
Keywords
Copper sulphide; Carbon dot; 3D grape string-like structure; Electrode material
Categories
Funding
- Natural Science Foundation of China [51672221, 51872231]
- Key Industrial Chain Project of Shaanxi Province [2018ZDCXL-GY-08-07]
- Seed Foundation of Innovation and Creation for Graduate Students in Northwestern Polytechnical University [ZZ2018006]
- National College Students Innovation and Entrepreneurship Training Program [201810699094]
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In this work, carbon dot decorated copper sulphide/carbon nanotubes (CuS@CD-CNTs) composite with a unique three-dimensional (3D) grape string-like structure was directly prepared via in situ hydrothermal process at the temperature of 180 degrees C for 12 h and applied for supercapacitors. The chemical composition and morphology were systematically tested by XRD, Raman, SEM and TEM characterization techniques. The as-prepared CuS@CD-CNTs composite brings out a novel 3D grape string-like structure, where the CuS spheres are distributed homogeneously with CNTs as a result of the addition of carbon dot. As the active material of pseudocapacitor electrode, the CuS@CD-CNTs composite delivers superior electrochemical properties with a decent specific capacitance of 736.1 F g(-1) at the current density of 1 A g(-1). Also, the CuS@CD-CNTs composite showed exceptional cycling stability, maintaining 92% retention after 5000 charge-discharge cycles. Such superior electrochemical properties owe to the collective contribution of CuS, CD and CNTs and 3D grape string-like architecture. The excellent electrochemical results above suggest that CuS@CD-CNTs composite has promising electrochemical energy storage application in supercapacitors. (C) 2019 Elsevier B.V. All rights reserved.
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