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Improved electro-grafting of nitropyrene onto onion-like carbon via in situ electrochemical reduction and polymerization: tailoring redox energy density of the supercapacitor positive electrode

Anothumakkool, Bihag and Taberna, Pierre-Louis and Daffos, Barbara and Simon, Patrice and Sayed-Ahmad-Baraza, Yuman and Ewels, Chris P. and Brousse, Thierry and Gaubicher, Joel Improved electro-grafting of nitropyrene onto onion-like carbon via in situ electrochemical reduction and polymerization: tailoring redox energy density of the supercapacitor positive electrode. (2017) Journal of Materials Chemistry. A, 5 (4). 1488-1494. ISSN 2050-7488

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Official URL: http://dx.doi.org/10.1039/C6TA08170C

Abstract

Herein, we report a improved method for the physical grafting of 1-nitropyrene (Pyr-NO2) onto highly graphitized carbon onion. This is achieved through a lowering of the onset potential of the pyrene polymerization via in situ reduction of the NO2 group. The additional redox activity pertaining to the reduced NO2 enables exceeding the faradaic capacity which is associated with the p-doping of the grafted pyrene backbone, as observed for pyrene, 1-aminopyrene, and unreduced Pyr-NO2. Theoretical calculations demonstrate the charge transfer and binding enthalpy capabilities of Pyr-NO2, which are significantly higher than those of the other two species, and which allow for improved p-stacking on the carbon surface. Upon 20 wt % grafting of Pyr-NO2, the capacity of the electrode jumps from 20 mAh g-1 electrode to 38 mAh g-1 electrode, which corresponds to 110 mAh g-1 per mass of Pyr-NO2 and the average potential is increased by 200 mV. Very interestingly, this high performance is also coupled with outstanding retention with respect to both the initial capacity for more than 4000 cycles, as well as the power characteristics, demonstrating the considerable advantages of employing the present in situ grafting technique.

Item Type:Article
Additional Information:Thanks to RSC editor. The original PDF of the article can be found at http://pubs.rsc.org/en/Content/ArticleLanding/2017/TA/C6TA08170C
HAL Id:hal-01581163
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution:French research institutions > Centre National de la Recherche Scientifique - CNRS (FRANCE)
Université de Toulouse > Institut National Polytechnique de Toulouse - INPT (FRANCE)
Université de Toulouse > Université Toulouse III - Paul Sabatier - UPS (FRANCE)
Other partners > Université de Nantes (FRANCE)
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Funders:
ANR - RS2E
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Deposited By: cirimat webmestre
Deposited On:04 Sep 2017 12:02

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