Scalable CNTs/NiCoSe2 Hybrid Films for Flexible All-Solid-State Asymmetric Supercapacitors

The rapidly developing wearable flexible electronics makes the development of high-performance flexible energy storage devices, such as all-solid-state supercapacitors (SCs), particularly important. Herein, we report the fabrication of CNTs/NiCoSe2 hybrid films on carbon cloth (CC) through a facile co-electrodeposition method based on flexible electrodes for all-solid-state SCs. The NiCoSe2 sheets grown on CNTs uniformly with a diameter of 50-100 nm act as the active materials. The CNTs in the hybrid films act as the scaffold to offer more deposition sites for NiCoSe2 and provide a conductive network to facilitate the transfer of electrons. Moreover, the one-step electrodeposition process avoids the usage of any organic binders. Benefiting from the high intrinsic reactivity and unique 3D architecture, the obtained CNTs/NiCoSe2 electrode delivers high specific capacity (218.1 mA h g(-1)) and satisfactory durability (over 5000 cycles). Remarkably, the CNTs/NiCoSe2//AC flexible all-solid-state (FASS) ASC provides remarkable energy density (112.2 W h kg(-)(1)) within 0-1.7 V and maintains 98.1% of its initial capacity after 10,000 cycles. In addition, this flexible ASC device could be fabricated at a large scale (5 x 6 cm(2)), and the LED arrays (>3.7 V) can be easily lighted up by three ASCs in series, showing its potential practical application.

Automated summary

The fabrication of CNTs/NiCoSe2 hybrid films on carbon cloth for all-solid-state supercapacitors was reported using a facile co-electrodeposition method. The CNTs act as a scaffold for NiCoSe2, providing more deposition sites and a conductive network for electron transfer. The obtained electrode exhibited high specific capacity and durability, delivering remarkable energy density and maintaining most of its initial capacity after numerous cycles.