Freestanding functionalized carbon nanotube-based electrode for solid-state asymmetric supercapacitors

Electrochemical methods followed by annealing to adjust the functional groups were used on freestanding CNT films. Solid-state asymmetric supercapacitors were fabricated by assembling functionalized CNT films with CNT/MoO3−x electrodes. The device showed a volumetric capacitance of 3.0 F cm−3, energy and power density of 1.5 mWh cm−3 and 4.2 W cm−3. We also fabricated a SCs pack to drive a homemade wireless transport system, demonstrating the potential for portable electronics.