Journal
JOURNAL OF ALLOYS AND COMPOUNDS
Volume 694, Issue -, Pages 136-144Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.jallcom.2016.09.302
Keywords
Composite materials; Energy storage materials; Electrode materials; Chemical synthesis; Electrochemical reactions; Electrochemical impedance spectroscopy
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Funding
- Natural Science Foundation of China (NSFC) [51063009, 21271031, 51203012]
- Beijing Natural Science Foundation of China [2132009, 2122015]
- Innovation Promotion Project of Beijing Municipal Commission of Education, China [TJSHG2015 11021002]
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A novel supercapacitor system with an ultrahigh electrochemical performance was prepared by applying a multi-walled carbon nanotubes (MWCNTs) - polyaniline (PANI) composite electrode and a redox potassium iodide (KI) electrolyte. The composite electrode possessed a good conductivity and a consecutive 3D conductive network. The amazing electrochemical performance came from the simultaneous redox reaction in both electrode and electrolyte. The maximum discharge specific capacitance was up to 4960 F/g (0.1 A/g) when the concentration of KI electrolyte was only 0.05 M in a three-electrode system. After 1000 charge-discharge cycles, it still reached to 1550 F/g when the current density was increased to 1.5 A/g. Furthermore, the specific capacitance, energy density and power density of 726 Fig, 100.8 Wh/kg and 499.8 W/kg, respectively, were also obtained in an asymmetric two-electrode system. (C) 2016 Elsevier B.V. All rights reserved.
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