Highly flexible all-solid-state supercapacitors based on carbon nanotube/polypyrrole composite films and fibers

Abstract

Flexible all-solid-state film-shaped supercapacitors in both film and fiber configurations have been fabricated by depositing polypyrrole (PPy) onto freestanding carbon nanotube (CNT) films and also directly twisting the composite film into thin fibers. These CNT/PPy films and fibers maintain a porous structure in which the PPy is coated on individual CNTs as well as their interconnections. The specific capacitance of a solid CNT/PPy composite film supercapacitor reaches 139.2 F/g (27.8 mF/cm 2 , 10 mV/s) and 331.4 F/g (5 mV/s) in a solid fiber supercapacitor directly twisting the CNT/PPy composite film into a fiber, which is attributed to the uniform PPy coating throughout the CNT film and both inside and outside of the fiber. These devices show high stability during 10000 charge and discharge cycles, and good flexibility under bending and twisting. Our CNT/PPy film and fiber-shaped supercapacitors have many potential applications in flexible electronics and energy storage textiles.

Soft and wrinkled carbon membranes derived from petals for flexible supercapacitors

“…The electrochemical performance of the WCM and AWCM as the electrode materials for EDLCs in a three-electrode system was evaluated in 0.5 M KCl electrolyte 29 30 31 . Figure 4a is the cyclic voltammogram (CV) curve comparison of the WCM and AWCM electrode at the same scan rate of 50 mV/s, where the area enclosed by the quasi-rectangular CV curve of the AWCM is much larger than that of the WCM.…”

Temperature-resistant and flexible supercapacitors based on 10-inch wafer-scale nanocarbon films

“…The pseudocapacitor electrode could combine the electrical double-layer capacitor electrode materials to enhance energy densities in favour of high electrochemical performances of supercapacitors [26][27][28][29][30]. Manganese oxide (MnO x ) is known as the most promising transition metal oxide material for supercapacitor electrodes due to its high specific capacitance, low cost, eco-friendliness, abundant sources and high compatibility [31][32][33].…”

Fabrication of Reduced Graphene Oxide Based Ultra-high Cycle Life Flexible Fiber Supercapacitor with Different Modes

“…The carbon microfiber bundles coated with MWCNT delivered the length capacitance of 6.3 mF cm −1 at 2 mV s −1 . Zhou et al has reported 27.8 mF cm −2 at 10 mV s −1 for the CNT/polypyrrole supercapacitor . Similarly, the Ni 3 S 2 ||pen ink and PPy/MnO 2 /rGO delivered the length capacitance of 8.16 mF cm −1 and 15.5 cm −1 in PVA/KOH and PVA/H 3 PO 4 polymer electrolytes .…”

“…[25] Zhou et al has reported 27.8 mF cm À2 at 10 mV s À1 for the CNT/polypyrrole supercapacitor. [26] Similarly, the Ni 3 S 2 j j pen ink and PPy/MnO 2 / rGO delivered the length capacitance of 8.16 mF cm À1 and 15.5 cm À1 in PVA/KOH and PVA/H 3 PO 4 polymer electrolytes. [27,28] The NiCo 2 O 4 NG@CF j j porous carbon flexible hybrid supercapacitor delivers the areal capacitance of 5.3 mF cm À2 at 3 mA.…”