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Vanadium sulfide (VS) 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 VS anchored on carbon nanocubes (denoted as VS/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 VS and CNTs on the electrochemical properties of VS/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 VS/CNTs. In the potential window of -1.4 V to 1.4 V, the VS/CNTs composite electrode delivers an outstanding specific capacitance of 330 F g (924 C g) at 1 A g, which is much higher than that of VS with 105 F g (294 C g). The VS/CNTs symmetric supercapacitor (SSC) device exhibits the areal capacitance as high as 676 mF cm (1488 mC cm) at 0.5 mA cm, and the energy density of 4.55 W h m (51.2 W h kg) at the power density of 2.75 W m (30.95 W kg) within a large voltage up to 2.2 V. All the results confirm that VS/CNTs composite with petal-shape structures is a promising material for high-performance energy storage devices.
This article was published in the following journal.
Name: Journal of colloid and interface science
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