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Materials 2016, 9(9), 734; doi:10.3390/ma9090734

New Supercapacitors Based on the Synergetic Redox Effect between Electrode and Electrolyte

1
School of Material Science and Engineering, Beijing Institute of Petrochemical Technology, Beijing 102617, China
2
State Key Laboratory of Organic-Inorganic Composites, Beijing University of Chemical Technology, Beijing 100029, China
3
Beijing Key Laboratory of Specialty Elastomer Composite Materials, Beijing Institute of Petrochemical Technology, Beijing 102617, China
*
Authors to whom correspondence should be addressed.
Academic Editor: Federico Bella
Received: 27 July 2016 / Revised: 23 August 2016 / Accepted: 23 August 2016 / Published: 29 August 2016
(This article belongs to the Section Energy Materials)
View Full-Text   |   Download PDF [4325 KB, uploaded 29 August 2016]   |  

Abstract

Redox electrolytes can provide significant enhancement of capacitance for supercapacitors. However, more important promotion comes from the synergetic effect and matching between the electrode and electrolyte. Herein, we report a novel electrochemical system consisted of a polyanilline/carbon nanotube composite redox electrode and a hydroquinone (HQ) redox electrolyte, which exhibits a specific capacitance of 7926 F/g in a three-electrode system when the concentration of HQ in H2SO4 aqueous electrolyte is 2 mol/L, and the maximum energy density of 114 Wh/kg in two-electrode symmetric configuration. Moreover, the specific capacitance retention of 96% after 1000 galvanostatic charge/discharge cycles proves an excellent cyclic stability. These ultrahigh performances of the supercapacitor are attributed to the synergistic effect both in redox polyanilline-based electrolyte and the redox hydroquinone electrode. View Full-Text
Keywords: supercapacitor; redox electrolyte; polyanilline; multi-wall carbon nanotube; synergistic effect supercapacitor; redox electrolyte; polyanilline; multi-wall carbon nanotube; synergistic effect
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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Zhang, Y.; Cui, X.; Zu, L.; Cai, X.; Liu, Y.; Wang, X.; Lian, H. New Supercapacitors Based on the Synergetic Redox Effect between Electrode and Electrolyte. Materials 2016, 9, 734.

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