Li, Z; Dall'Agnese, Y; Guo, J; Huang, H; Liang, X; Xu, S; (2020) Flexible freestanding all-MXene hybrid films with enhanced capacitive performance for powering a flex sensor. Journal of Materials Chemistry A , 8 (32) pp. 16649-16660. 10.1039/d0ta05710j.

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Abstract

Stacking different two-dimensional (2D) nanomaterials into composite structures opens an opportunity to fabricate electrodes combining the advantages of the individual nanomaterial. Here, different types of MXene nanosheets are combined to create flexible all-MXene hybrid films with high gravimetric capacitance and excellent rate performance for flexible supercapacitors. Ti3C2Tx nanosheets are introduced in-between Nb2CTx layers, leading to a significantly increased interlayer spacing. The self-restacking of both types of MXenes nanosheets is effectively impeded, accelerating the diffusion of electrolyte ions and enabling more accessible 2D nanochannels. The freestanding Ti3C2Tx/Nb2CTx films delivers a high gravimetric capacitance of 370 F g-1 at a scan rate of 2 mV s-1 , good rate performance with 56.1% capacitance retention at 200 mV s-1 and long cycle life. Furthermore, the energy density of the assembled all-solid-state symmetric supercapacitor can reach up to 5.5 mWh g-1 at power density of 141.4 mW g-1 . Serving as stable power source unit, the all-solid-state supercapacitor was also integrated with a flex sensor to fabricated self-powered device. The route to fabricate Ti3C2Tx/Nb2CTx hybrid films with enhanced electrochemical performance is also applicable for other MXenes, promoting the applications of MXenes for flexible supercapacitors and integrated electronic devices.

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