Hydrothermal synthesis of VS4/CNTs composite with petal-shape structures performing a high specific capacity in a large potential range for high-performance symmetric supercapacitors.
J Colloid Interface Sci
; 554: 191-201, 2019 Oct 15.
Article
em En
| MEDLINE
| ID: mdl-31299547
ABSTRACT
Vanadium sulfide (VS4) is recognized as a good anode material for energy storage devices because of its chain-like structure and high content of sulfur. Herein, the patronite VS4 anchored on carbon nanocubes (denoted as VS4/CNTs) with a petal-shape structure consisting of nanolayers is successfully prepared through a one-step hydrothermal reaction. The influence of the optimal ratio of VS4 and CNTs on the electrochemical properties of VS4/CNTs composite is studied by cyclic voltammetry (CV), galvanostatic charge-discharge (GCD) and electrochemical impedance spectroscopy (EIS). The addition of CNTs increases the conductivity and relieves the volume expansion/contraction, resulting excellent electrochemical properties of VS4/CNTs. In the potential window of -1.4â¯V to 1.4â¯V, the VS4/CNTs composite electrode delivers an outstanding specific capacitance of 330â¯Fâ¯g-1 (924â¯Câ¯g-1) at 1â¯Aâ¯g-1, which is much higher than that of VS2 with 105â¯Fâ¯g-1 (294â¯Câ¯g-1). The VS4/CNTs symmetric supercapacitor (SSC) device exhibits the areal capacitance as high as 676â¯mFâ¯cm-2 (1488â¯mCâ¯cm-2) at 0.5â¯mAâ¯cm-2, and the energy density of 4.55â¯Wâ¯hâ¯m-2 (51.2â¯Wâ¯hâ¯kg-1) at the power density of 2.75â¯Wâ¯m-2 (30.95â¯Wâ¯kg-1) within a large voltage up to 2.2â¯V. All the results confirm that VS4/CNTs composite with petal-shape structures is a promising material for high-performance energy storage devices.
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01-internacional
Base de dados:
MEDLINE
Idioma:
En
Revista:
J Colloid Interface Sci
Ano de publicação:
2019
Tipo de documento:
Article