Amine-enriched Graphene Quantum Dots for High-pseudocapacitance Supercapacitors

[Display omitted] •Amine-enriched porous carbon electrodes have been fabricated by the electrostatic fusion of amine-functionalized single-crystalline GQDs.•The carbon films deliver ultrahigh specific capacitance (400–595Fg−1) by inducing a high concentration of active amine moieties at edge.•GQD su...

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Bibliographic Details
Published in:Electrochimica acta 2016-08, Vol.208, p.260-266
Main Authors: Li, Zhen, Qin, Ping, Wang, Liang, Yang, Chengshuai, Li, Yanfeng, Chen, Zhiwen, Pan, Dengyu, Wu, Minghong
Format: Article
Language:English
Subjects:
amine-functionalization
Arrays
Capacitance
Carbon
Graphene
graphene quantum dots
Nanostructure
pseudocapacitance
Quantum dots
Supercapacitors
Titanium dioxide
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Summary:[Display omitted] •Amine-enriched porous carbon electrodes have been fabricated by the electrostatic fusion of amine-functionalized single-crystalline GQDs.•The carbon films deliver ultrahigh specific capacitance (400–595Fg−1) by inducing a high concentration of active amine moieties at edge.•GQD supercapacitors offer energy density up to 21.8Whkg−1 and retain 90% of the initial capacitance after 10,000 cyclic voltammetry tests.•Amine-enriched GQDs can function as a highly active, solution-processable pseudocapacitive materials applicable to high-performance supercapacitors. The applications of carbon-based supercapacitors have been limited by their low energy storage density owing to their limited active storage sites. To overcome this limitation, amine-enriched porous carbon electrodes have been fabricated by the electrostatic fusion of amine-functionalized single-crystalline graphene quantum dots (GQDs) within conductive, vertically ordered TiO2 nanotube arrays as the collectors. The carbon films deliver ultrahigh specific capacitance (400–595Fg−1) even beyond the theoretical upper limit of single-layer graphene by inducing a high concentration of active amine moieties at edge. Symmetrical GQD supercapacitors in H2SO4 electrolyte offer energy density up to 21.8Whkg−1 and retain 90% of the initial capacitance after 10000 cyclic voltammetry tests. The results show that amine-enriched GQDs can function as a new kind of highly active, solution-processable, and low-cost pseudocapacitive materials applicable to high-performance supercapacitors.
ISSN:0013-4686
1873-3859
DOI:10.1016/j.electacta.2016.05.030