Abstract
Vanadium nitride (VN) shows promising electrochemical properties as an energy storage devices electrode, specifically in supercapacitors. However, the pseudocapacitive charge storage in aqueous electrolytes shows mediocre performance. Herein, we judiciously demonstrate an impressive pseudocapacitor performance by hybridizing VN nanowires with pseudocapacitive 2D-layered MoS2 nanosheets. Arising from the interfacial engineering and pseudocapacitive synergistic effect between the VN and MoS2, the areal capacitance of VN/MoS2 hybrid reaches 3187.30 mF cm−2, which is sevenfold higher than the pristine VN (447.28 mF cm−2) at a current density of 2.0 mA cm−2. In addition, an asymmetric pseudocapacitor assembled based on VN/MoS2 anode and TiN coated with MnO2 (TiN/MnO2) cathode achieves a remarkable volumetric capacitance of 4.52 F cm−3 and energy density of 2.24 mWh cm−3 at a current density of 6.0 mA cm−2. This work opens a new opportunity for the development of high-performance electrodes in unfavorable electrolytes towards designing high areal-capacitance electrode materials for supercapacitors and beyond.
Highlights
Since Kumta’s work on vanadium nitride (VN) nanostructure [1,2], VN has extensively been used as anode material for supercapacitors (SCs) [3,4,5]
X-ray diffraction (XRD) analysis for the VN samples obtained at temperatures of 500, 600 and 700 ◦C, shows three peaks that correspond to cubic VN (Joint Committee on Powder Diffraction Standards, JCPDS-#35-0768) and are denoted as VN-500, VN-600 and VN-700 (Figure S1a)
The difference between these three VN samples is that the intensity of the (111), (200) and (220) phases of VN increases with increasing temperature indicating that the crystallinity of VN increases upon increasing temperature
Summary
Since Kumta’s work on vanadium nitride (VN) nanostructure [1,2], VN has extensively been used as anode material for supercapacitors (SCs) [3,4,5]. This is due to its large theoretical capacitance [6,7], suitable working negative potential window [8,9,10], excellent electrical conductivity [10] as well as pseudocapacitive properties [11]. It is highly important to improve and further explore the pseudocapacitance charge storage of VN in LiCl electrolyte
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