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Flexible Films Derived from Electrospun Carbon Nanofibers Incorporated with Co 3 O 4 Hollow Nanoparticles as Self‐Supported Electrodes for Electrochemical Capacitors
Author(s) -
Zhang Fang,
Yuan Changzhou,
Zhu Jiajia,
Wang Jie,
Zhang Xiaogang,
Lou Xiong Wen David
Publication year - 2013
Publication title -
advanced functional materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 6.069
H-Index - 322
eISSN - 1616-3028
pISSN - 1616-301X
DOI - 10.1002/adfm.201203844
Subject(s) - materials science , electrode , electrochemistry , carbon nanofiber , nanoparticle , capacitance , nanofiber , chemical engineering , capacitor , electrospinning , current density , porosity , nanotechnology , composite material , carbon nanotube , voltage , polymer , chemistry , physics , quantum mechanics , engineering
Flexible porous films are prepared from electrospun carbon nanofibers (CNFs) embedded with Co 3 O 4 hollow nanoparticles (NPs) and are directly applied as self‐supported electrodes for high‐performance electrochemical capacitors. Uniform Co 3 O 4 hollow NPs are well dispersed and/or embedded into each CNF with desirable electrical conductivity. These Co 3 O 4 ‐CNFs intercross each other and form 3D hierarchical porous hybrid films. Benefiting from intriguing structural features, the unique binder‐free Co 3 O 4 hollow NPs/CNF hybrid film electrodes exhibit high specific capacitance (SC), excellent rate capability and cycling stability. As an example, the flexible hybrid film with loading of 35.9 wt% Co 3 O 4 delivers a SC of 556 F g −1 at a current density of 1 A g −1 , and 403 F g −1 even at a very high current density of 12 A g −1 . Remarkably, almost no decay in SC is found after continuous charge/discharge cycling for 2000 cycles at 4 A g −1 . This exceptional electrochemical performance makes such novel self‐supported Co 3 O 4 ‐CNFs hybrid films attractive for high‐performance electrochemical capacitors.