Journal
JOURNAL OF COLLOID AND INTERFACE SCIENCE
Volume 574, Issue -, Pages 312-323Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcis.2020.04.072
Keywords
VS4/CNTs/rGO composite; Sandwich-like structure; Electrode; Electrochemical properties; Supercapacitor
Categories
Funding
- National Natural Science Foundation of China [21771030, 21573034, 21771029]
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Exploring electrode materials with excellent electrochemical performance is the key to the development of applications in energy storage and conversion. Herein, three-dimensional (3D) vanadium sulfide/carbon nanotubes/reduced graphene oxide (VS4/CNTs/rGO) composite is synthesized by a simple one-step hydrothermal method. VS4 short nanorods cover the both sides of the rGO sheets, and CNTs distribute at the edge of the composite to form a sandwich-like structure, which effectively prevents the accumulation of rGO. Due to the special 3D hierarchical structure, VS4/CNTs/rGO exhibits a large specific surface area and a rich pore structure, and the addition of CNTs and rGO also improves the electrochemical properties of VS4. At 1 A.g(-1), VS4/CNTs/rGO exhibits a capacitance of 497 F.g(-1) (1374.0 C.g(-1)) in the voltage range of -1.4 to 1.4 V, which is much higher than those binary materials including CNTs/rGO, VS4/CNTs and VS4/rGO. The VS4/CNTs/rGO symmetric supercapacitor (SSC) device shows a remarkable electrochemical performance in a large potential window up to 2.2 V. The capacitance of VS4/CNTs/rGO SSC device can reach 1003.5 mF.cm(-2) (2207.6 mC.cm(-2)) at 0.5 mA.cm(-2), and it exhibits an energy density of 6.75 Wh.m(-2 )(72.07 Wh.kg(-1)) at a power density of 1.38 W.m(-2) (14.69 W.kg(-1)). The high capacitance and energy density of the VS4/CNTs/rGO composite in the high voltage interval make it as the potential energy storage material. (C) 2020 Elsevier Inc. All rights reserved.
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