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Organic Multi-electron Redox Couples-induced Functionalization for Enabling Ultrahigh Rate and Cycling Performances of Supercapacitors

Abstract

In the present work, the Danthron molecule (1, 8-Dihydroxyanthraquinone, DT) with multi-electron redox centers as a novel organic electrochemically active material for supercapacitors has been decorated on reduced graphene oxide nanosheets (RGNs) via a facile one-step reflux method. The resultant Danthron functionalized RGNs (DT-RGNs) composite electrode material not only provided a fast and reversible 4e-/4H+ redox reaction because of two types of redox-active organic functional groups (carbonyl and hydroxyl) in DT, but also reserved the unique electrode architecture with required conductivity of the graphene nanosheets. In the three-electrode system, optimized electrode (DT-RGNs 3:5) exhibited an excellent capacitance of 491 F g-1 at 1 A g-1 which is three times higher than bare RGNs. Most importantly, DT-RGNs electrode showed an ultrahigh rate capability of 80.8 % capacitance retention at 100 A g-1 and superior electrochemical stability of 98.8 % after 10, 000 cycles at 10 A g-1, outstripping a great amount of reported organic and inorganic electrodes. Meanwhile, the effect of intramolecular and/or intermolecular hydrogen bond between carbonyl and hydroxyl on the electrochemical properties of DT-RGNs electrode was investigated. Finally, the novel symmetric supercapacitor (DT-RGNs SSC) was assembled to evaluate the actual energy storage property of electrode material.

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Publication details

The article was received on 21 Aug 2017, accepted on 15 Oct 2017 and first published on 16 Oct 2017


Article type: Paper
DOI: 10.1039/C7TA07389E
Citation: J. Mater. Chem. A, 2017, Accepted Manuscript
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    Organic Multi-electron Redox Couples-induced Functionalization for Enabling Ultrahigh Rate and Cycling Performances of Supercapacitors

    N. An, Z. Hu, H. Wu, Y. Yang, Z. Lei and W. Dong, J. Mater. Chem. A, 2017, Accepted Manuscript , DOI: 10.1039/C7TA07389E

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