Boron Nitride/Ti3C2T x MXene Nanosheet/WS2 Nanostructure Ternary Composites for All-Solid-State Flexible Asymmetric Supercapacitors

MXene-based nanomaterials are emerging candidates forenergy storageapplications due to their metallic conductivity, large surface area,and facile redox activity. The sheet restacking tendency and oxidationsignificantly reduce their application in different industries. Thisstudy reported a facile hydrothermal synthesis of a tungsten disulfide(WS2)-decorated Ti3C2T (x) /functionalized-boron nitride (BN) nanohybrid asa cathode for all-solid-state flexible asymmetric supercapacitors.The MXene/functionalized BN heterostructure showed an increased surfacearea by reducing the sheet restacking. On the other hand, incorporationof WS2 over the MXene/functionalized BN sheets led to theaddition of redox-active centers. The loading of WS2 overMXene/functionalized BN was varied to obtain an optimum electrodethat delivered a specific capacitance of 1318 F g(-1) at 1 A g(-1) in 1 M KOH. An all-solid-state flexibleasymmetric supercapacitor was assembled using PVA-KOH-KIgel electrolyte where KI functioned as a redox additive to increasethe supercapacitor's performance. The assembled device achievedan excellent specific capacitance of 140 F g(-1) anda 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-emittingdiode (LED), indicating their potential practical applicability infuture portable electronics.

Automated summary

This study reports a facile hydrothermal synthesis of tungsten disulfide (WS2)-decorated MXene/functionalized boron nitride (BN) nanohybrid as a cathode for all-solid-state flexible asymmetric supercapacitors. The MXene/functionalized BN heterostructure showed increased surface area by reducing sheet restacking, and incorporation of WS2 added redox-active centers. The assembled device exhibited a specific capacitance of 140 F g(-1) and an energy density of 19.4 Wh kg(-1) at 1 A g(-1), with 84% capacitance retention after 10,000 cycles. Additionally, the device was able to power a light-emitting diode (LED), indicating its potential practical applicability in future portable electronics.