Carbon fibers surface-grown with helical carbon nanotubes and polyaniline for high-performance electrode materials and flexible supercapacitors

• Published in: Journal of electroanalytical chemistry (Lausanne, Switzerland) Vol. 828; pp. 24 - 32
• Main Authors: Luo, Hongchun, Lu, Hengqing, Qiu, Jun
• Format: Journal Article
• Language: English
• Published: Amsterdam Elsevier B.V 01.11.2018; Elsevier Science Ltd
• Subjects: 3D porous structure; Capacitance; Carbon fiber reinforced plastics; Carbon fiber reinforcement; Carbon fibers; Carbon nanotubes; Charge transfer; Chemical vapor deposition; Current density; Deformation effects; Deformation mechanisms; Electrochemical analysis; Electrode materials; Electrodes; Filters; Flexible supercapacitors; Helically carbon nanotubes; Organic chemistry; Polyanilines; Radiometers; Sensors; Stability; Supercapacitors; Twisting; Flexible supercapacitors; 3D porous structure; Carbon fibers; Helically carbon nanotubes
• ISSN: 1572-6657; 1873-2569
• DOI: 10.1016/j.jelechem.2018.09.007

Carbon fiber-based flexible supercapacitors have attracted wide attention due to their excellent properties. In this paper, a novel high performance flexible supercapacitor is reported. The carbon fibers surface-grown with helical carbon nanotubes (CF-HCNTs) are prepared using chemical vapor deposition and then combined with PANI by in-situ polymerization to form a 3D porous structure. The carbon fibers surface-grown with helical carbon nanotubes and polyaniline (CF-HCNTs-PANI) flexible supercapacitor electrodes exhibit a high capacitance of 660 F/g at a current density of 1 A/g with good cycling stability (90.4% capacitance retention after 1000 charge/discharge cycles) and low interfacial charge-transfer resistance of 0.5 Ω. These excellent electrochemical performances are attributed to faradic pseudocapacity, large surface area, 3D porous structure of the CF-HCNTs-PANI electrodes and unique multi-scale fibrous materials. Furthermore, the all-solid-state CF-HCNTs-PANI flexible supercapacitor shows a good specific capacitance of 439 F/g at a current density of 0.05 A/g and has excellent deformation stability. Its electrochemical performance does not cause obvious effect after bending and twisting (95.4% capacitance retention after 500 bending/recovery cycles and near no change after twisting). The CF-HCNTs-PANI electrode with the unique nanostructure will play an important role in the preparation of flexible supercapacitors. •Carbon fibers surface-grown with helical carbon nanotubes and polyaniline electrode has been successfully synthesized.•CF-HCNTs-PANI electrodes possess good electrochemical properties and high flexibility.•All-solid-state flexible supercapacitors show good specific capacitance and excellent deformation stability