Journal
JOURNAL OF POWER SOURCES
Volume 357, Issue -, Pages 107-116Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jpowsour.2017.05.001
Keywords
Carbon nanosheets; Dual redox additives; Cooperative effect; Voltage window; Supercapacitors
Funding
- National Natural Science Foundation of China [51602003]
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Using thiocarbanilide and Mg(OH)(2) powders as carbon precursor and template, respectively, novel 2D carbon nanosheets with large area have been produced. Next, based on the cooperative effect, 1, 4-dihydroxyanthraquinone (DQ) and hydroquinone (HQ) regarded as efficient dual redox additives have been incorporated into the electrode carbon material and H2SO4 electrolyte, respectively, to largely elevate the capacitive performance of supercapacitors. More importantly, the cooperative effect results from the redox processes of DQ and HQ consecutively occurring in the electrode carbon material and aqueous H2SO4 electrolyte, respectively. Besides, the molar ratio of DQ and HQ exerts a crucial role in the determination of the electrochemical behaviors and eventually the optimum condition is the mass ratio of 1: 1 concerning the DQ and porous carbon within solid electrode while retaining the HQ concentration as 20 mmol L-1 in 1 mol L-1 H2SO4 electrolyte. As a result, the maximum specific capacitance is achieved of 239 F g(-1) at 3 A g(-1), and furthermore the maximum energy density up to 21.1 Wh kg(-1) is almost 3.5 times larger than that of the one without introducing any redox additive. (C) 2017 Elsevier B.V. All rights reserved.
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