New Method for the Synthesis of 2D
Vanadium Nitride (MXene) and Its Application as a Supercapacitor Electrode
Posted on 2020-07-13 - 22:29
MXenes are the class of two-dimensional
transition metal carbides
and nitrides that exhibit unique properties and are used in a multitude
of applications such as biosensors, water purification, electromagnetic
interference shielding, electrocatalysis, supercapacitors, and so
forth. Carbide-based MXenes are being widely explored, whereas investigations
on nitride-based ones are seldom. Among the nitride-based MXenes obtained
from their MAX phases, only Ti4N3 and Ti2N are reported so far. Herein, we report a novel synthesis
of V2NTx (Tx is the surface termination) obtained by the selective removal
of “Al” from V2AlN by immersing powders of
V2AlN in the LiF–HCl mixture (salt–acid etching)
followed by sonication to obtain V2NTx (Tx = −F, −O) MXene
which is then delaminated using the dimethyl sulfoxide solvent. The
V2NTx MXene is characterized
by X-ray diffraction studies, field emission scanning electron microscope
imaging, energy-dispersive X-ray spectroscopy, X-ray photoelectron
spectroscopy, and high-resolution transmission electron microscope
imaging. Supercapacitor electrodes are prepared using V2NTx MXenes and their electrochemical
performances are examined by cyclic voltammetry, galvanostatic charge/discharge
measurement, and electrochemical impedance spectroscopy. The V2NTx MXene electrode exhibits a
specific capacitance of 112.8 F/g at a current density of 1.85 mA/cm2 with an energy and power density of 15.66 W h/kg and 3748.4
W/kg, respectively, in 3.5 M KOH aqueous electrolyte. The electrode
exhibits an excellent capacitance retention of 96% even after 10,000
charge/discharge cycles. An asymmetric supercapacitor fabricated with
V2NTx as a negative electrode
and Mn3O4 nanowalls as a positive electrode
helps obtain a cell voltage of 1.8 V in aqueous KOH electrolyte.
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Venkateshalu, Sandhya; Cherusseri, Jayesh; Karnan, Manickavasakam; Kumar, Kowsik Sambath; Kollu, Pratap; Sathish, Marappan; et al. (2020). New Method for the Synthesis of 2D
Vanadium Nitride (MXene) and Its Application as a Supercapacitor Electrode. ACS Publications. Collection. https://doi.org/10.1021/acsomega.0c01215
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AUTHORS (9)
SV
Sandhya Venkateshalu
JC
Jayesh Cherusseri
MK
Manickavasakam Karnan
KK
Kowsik Sambath Kumar
PK
Pratap Kollu
MS
Marappan Sathish
JT
Jayan Thomas
SJ
Soon Kwan Jeong
AG
Andrews Nirmala Grace
KEYWORDS
V 2 NT x MXeneelectrochemical impedance spectroscopyMn 3 O 4 nanowallsX-ray diffraction studiesV 2 NT x MXene electrode exhibitsSupercapacitor Electrode MXenesMAXelectromagnetic interference shieldingtransmission electron microscope im...T xV 2 NT xfield emission scanning electron mi...2 D Vanadium NitrideTi 4 N 3energy-dispersive X-ray spectroscopyV 2 AlNtransition metal carbidesTi 2 N3.5 M KOHX-ray photoelectron spectroscopyV 2 NT x MXenes