MXene-based nanomaterials are emerging candidates for
energy storage
applications due to their metallic conductivity, large surface area,
and facile redox activity. The sheet restacking tendency and oxidation
significantly reduce their application in different industries. This
study reported a facile hydrothermal synthesis of a tungsten disulfide
(WS2)-decorated Ti3C2T
x
/functionalized-boron nitride (BN) nanohybrid as
a cathode for all-solid-state flexible asymmetric supercapacitors.
The MXene/functionalized BN heterostructure showed an increased surface
area by reducing the sheet restacking. On the other hand, incorporation
of WS2 over the MXene/functionalized BN sheets led to the
addition of redox-active centers. The loading of WS2 over
MXene/functionalized BN was varied to obtain an optimum electrode
that delivered a specific capacitance of 1318 F g–1 at 1 A g–1 in 1 M KOH. An all-solid-state flexible
asymmetric supercapacitor was assembled using PVA–KOH–KI
gel electrolyte where KI functioned as a redox additive to increase
the supercapacitor’s performance. The assembled device achieved
an excellent specific capacitance of 140 F g–1 and
a good energy density of 19.4 Wh kg–1 at 1 A g–1 with 84% capacitance retention after 10,000 cycles.
Additionally, the assembled devices were able to brightly glow a light-emitting
diode (LED), indicating their potential practical applicability in
future portable electronics.