Inkjet-printed flexible V 2 CT x film electrodes with excellent photoelectric properties and high capacities for energy storage device.

Energy storage devices are progressively advancing in the light-weight, flexible, and wearable direction. Ti ₃ C ₂ T _x flexible film electrodes fabricated via a non-contact, cost-effective, high-efficiency, and large-scale inkjet printing technology were capable of satisfying these demands in our previous report. However, other MXenes that can be employed in flexible energy storage devices remain undiscovered. Herein, flexible V ₂ CT _x film electrodes (with the low formula weight vs Ti ₃ C ₂ T _x film electrodes) with both high capacities and excellent photoelectric properties were first fabricated. The area capacitances of V ₂ CT _x film electrodes reached 531.3-5787.0 μF⋅cm ^-2 at 5 mV⋅s ^-1 , corresponding to the figure of merits (FoMs) of 0.07-0.15. Noteworthy, V ₂ CT _x film electrode exhibited excellent cyclic stability with the capacitance retention of 83 % after 7,000 consecutive charge-discharge cycles. Furthermore, flexible all solid-state symmetric V ₂ CT _x supercapacitor was assembled with the area capacitance of 23.4 μF⋅cm ^-2 at 5 mV⋅s ^-1 . Inkjet printing technology reaches the combination of excellent photoelectric properties and high capacities of flexible V ₂ CT _x film electrodes, which provides a new strategy for manufacturing MXene film electrodes, broadening the application prospect of flexible energy storage devices.
Competing Interests: Declaration of competing interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.
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