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Issue 3, 2019
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Ultrahigh energy density of a N, O codoped carbon nanosphere based all-solid-state symmetric supercapacitor

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Abstract

Quinones are attractive redox-active starting materials due to their excellent electron transfer kinetics and outstanding redox reversibility, while amines featuring high electron-pair donicity reinforce the redox behavior of quinones and simultaneously introduce redox groups themselves. Herein, a novel quinone-amine route is designed to fabricate N, O codoped porous carbon nanospheres (PCNs) by direct carbonization–activation of a quinone-amine polymer which serves as an “all-in-one” precursor for the carbon source and self-dopant. The synthesis features simplicity, high efficiency and scale-up potential, based on the polymerization of p-benzoquinone and 3,3′-diaminobenzidine in ethanol under mild conditions, without any template, complicated technique or tedious procedure. PCNs integrate the superiorities of uniform spherical geometry, superior pore structure, and ultrahigh surface area and N/O content. A typical PCN electrode exhibits a high capacitance (376 F g−1 at 0.5 A g−1 in a three-electrode system) in KOH electrolyte. The assembled supercapacitor based on the PCN electrode and KOH electrolyte delivers a capacitance of 72.5 F g−1 and an energy output of 6.5 W h kg−1. More importantly, a constructed symmetric supercapacitor using an ionic liquid gel electrolyte gives an ultrahigh energy density up to 65.8 W h kg−1, along with superb cycling stability. This study presents a more convenient and competitive route to design functionalized carbons for highly efficient energy storage.

Graphical abstract: Ultrahigh energy density of a N, O codoped carbon nanosphere based all-solid-state symmetric supercapacitor

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Publication details

The article was received on 22 Oct 2018, accepted on 06 Dec 2018 and first published on 06 Dec 2018


Article type: Paper
DOI: 10.1039/C8TA10158B
Citation: J. Mater. Chem. A, 2019,7, 1177-1186
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    Ultrahigh energy density of a N, O codoped carbon nanosphere based all-solid-state symmetric supercapacitor

    Z. Song, D. Zhu, L. Li, T. Chen, H. Duan, Z. Wang, Y. Lv, W. Xiong, M. Liu and L. Gan, J. Mater. Chem. A, 2019, 7, 1177
    DOI: 10.1039/C8TA10158B

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