title: Directly-Grown Hierarchical Carbon Nanotube@Polypyrrole Core-Shell Hybrid for High-Performance Flexible Supercapacitors.
abstract: A hierarchical carbon nanotube-polypyrrole (CNT-PPy) core-shell composite was fabricated by growing CNTs directly on carbon cloth (CC) as a skeleton followed by electropolymerization of PPy with controlled polymerization time. Direct fabrication of electroactive (CNT-PPy) materials on the flexible CC electrode could reduce the interfacial resistance between the electrode and electrolyte and improve the ion diffusion. The supercapacitor electrode based on optimized PPy/CNT-CC exhibits excellent electrochemical performance, with the highest gravimetric capacitance being roughly 1038 F g(-1) per active mass of PPy and up to 486.1 F g(-1) per active mass of the PPy/CNT composite. Notably, excellent flexibility and cycle stability up to 10 000 cycles with only 18 % capacitance loss was achieved. At the same time, the fabricated asymmetric supercapacitor (PPy/CNT-CC∥CNT-CC) shows the maximum power density of 10 962 W kg(-1) at an energy density of 3.9 Wh kg(-1) under the operating potential of 1.4 V. The overall high cycle stability and high performance of the fabricated PPy/CNT-CC flexible electrode is due to the novel binder-free direct growth process.
authors.affiliation: Center for Condensed Matter Sciences, National Taiwan University, No. 1, Roosevelt Road, Sec. 4, Taipei, 10617, Taiwan.
authors.forename: Yesi
authors.initials: Y
authors.lastname: Yesi
authors.affiliation: Institute of Atomic and Molecular Sciences, Academia Sinica, No. 1, Roosevelt Road, Sec. 4, Taipei, 10617, Taiwan.
authors.forename: Indrajit
authors.initials: I
authors.lastname: Shown
authors.affiliation: Institute of Atomic and Molecular Sciences, Academia Sinica, No. 1, Roosevelt Road, Sec. 4, Taipei, 10617, Taiwan.
authors.forename: Abhijit
authors.initials: A
authors.lastname: Ganguly
authors.affiliation: Institute of Atomic and Molecular Sciences, Academia Sinica, No. 1, Roosevelt Road, Sec. 4, Taipei, 10617, Taiwan.
authors.forename: Trung Truc
authors.initials: TT
authors.lastname: Ngo
authors.affiliation: Center for Condensed Matter Sciences, National Taiwan University, No. 1, Roosevelt Road, Sec. 4, Taipei, 10617, Taiwan. chenkh@pub.iams.sinica.edu.tw.
authors.forename: Li-Chyong
authors.initials: LC
authors.lastname: Chen
authors.affiliation: Center for Condensed Matter Sciences, National Taiwan University, No. 1, Roosevelt Road, Sec. 4, Taipei, 10617, Taiwan. chenlc@ntu.edu.tw.|Institute of Atomic and Molecular Sciences, Academia Sinica, No. 1, Roosevelt Road, Sec. 4, Taipei, 10617, Taiwan. chenlc@ntu.edu.tw.
authors.forename: Kuei-Hsien
authors.initials: KH
authors.lastname: Chen
mesh_terms: D008855:Microscopy, Electron, Scanning; D046529:Microscopy, Electron, Transmission; D037742:Nanotubes, Carbon / Q000737:chemistry*; D058105:Polymerization; D011108:Polymers / Q000737:chemistry*; D011758:Pyrroles / Q000737:chemistry*; D013059:Spectrum Analysis, Raman
chemical_list: D037742:Nanotubes, Carbon; D011108:Polymers; D011758:Pyrroles; C067635:polypyrrole
keywords: carbon; flexible; nanotubes; polypyrrole; supercapacitor