Journal
ELECTROCHIMICA ACTA
Volume 317, Issue -, Pages 250-260Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2019.05.129
Keywords
pi-Conjugated polymer; Porous graphene; Quasi-solid-state polymer electrolyte; Flexible supercapacitors
Categories
Funding
- National Natural Science Foundation of China [51673064, 21875065]
- International Science & Technology Cooperation Program of China [2016YFE0131200]
- Shanghai Municipality Research Project [15520720500]
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Polyaniline (PANI) has been regarded as a promising electrode material for energy storage devices. However, unsatisfactory cycling stability seriously restricts its practical application. Herein, the nitrogen-doped porous graphene (NPG) film-supported vertically aligned polyaniline nanocones (NPG@PANI) flexible cathodes were synthesized by electrochemical polymerization. The as-prepared NPG@PANI displays unique porous morphology and strong pi-pi stacking interaction, which facilitates charge transportation and suppresses the dissolution as well as relieves volume changes of PANI during charging-discharging process. Moreover, a novel quasi-solid-state polymer electrolyte (QPE) of porous acrylate rubber/tetraethylammonium tetrafluoroborate-acetonitrile (pACM/Et4NBF4-AN) with enhanced ionic conductivity was prepared to match with pi-conjugated polymer electrodes, which helps to restrain the dissolution and the structure degradation of electrodes. To enhance the energy density, the organic asymmetric flexible supercapacitor (oAFSC) was assembled by NPG@PANI cathode, NPG supported-poly(1,5-diaminoanthraquinone) (NPG@PDAA) anode and pACM/Et4NBF4-AN QPE. The as-assembled oAFSC shows high energy density (6.18 mWh cm(-3)), good rate capability and superior cycling stability (88.7% capacitance retention after 10000 cycles). (C) 2019 Elsevier Ltd. All rights reserved.
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