Herein,
we report the hydrothermal synthesis of g-C3N4/BiVO4 nanocomposite materials for high-energy
and high-operating-voltage supercapattery in aqueous electrolyte.
The surface morphology and particle size of the prepared nanocomposite
were examined by field emission scanning electron microscopy (FE-SEM)
and high-resolution transmission electron microscopy (HR-TEM) analyses.
From the analyses, the formed rice-pellet-like BiVO4 is
uniformly decorated over the g-C3N4 nanosheets.
This enhances the wettability of material and leads to easy permeability
of electrolyte ions in electrode, which help enhance the specific
capacity value. The g-C3N4/BiVO4 (6
wt % of g-C3N4) nanocomposite material exhibited
a high specific capacity of 2171 C/g at a current density of 2 A/g
in the three-electrode configuration. The symmetric supercapattery
device using the g-C3N4/BiVO4 (6
wt % g-C3N4) nanocomposite material delivered
high energy and power densities of 61 Wh/kg and 16.2 kW/kg, respectively,
in aqueous electrolyte with a maximum operating cell potential of
2 V. It exhibits a very high electrochemical stability of 130% at
the current density of 20 A/g over 20 000 cycles with a coulombic
efficiency of 98.8%. The superior properties of the device can attribute
to the synergistic effect of both capacitive (nonfaradic) and battery-type
(noncapacitive) processes in the charge storage mechanism of the nanocomposite
material.
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