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Boosting the Supercapacitor Performance of Activated Carbon by Constructing Overall Conductive Networks Using Graphene Quantum Dots

Abstract

Although high-surface-area activated carbons have been widely used for supercapacitors, they usually have limited capacitive and rate performances primarily because of the low conductivity and sluggish electrochemical kinetics caused by their amorphous microporous structure. Here, we report a simple strategy to boost the electrochemical performance of activated carbons through embedding highly crystallized graphene quantum dots. Benefiting from formation of the overall conductive networks, the charge-transfer and ion migration kinetics of the activated carbon are significantly improved, facilitating electrolyte ion transport and storage in deep and branched micropores. As a result, the graphene quantum dots embedded activated carbon, possessing microporous structure with a specific surface area of 2829 m2 g-1, achieves remarkably high electric double-layer capacitances of 388 F g-1 at 1 A g-1 as well as excellent rate performance with 60% capacitance retention at 100 A g-1 in two-electrode system. The capacitive and rate performances are much higher than not only the activated carbon without graphene quantum dots, but also most porous carbons reported in the literatures. This strategy provides a new thought for designing advanced porous carbon materials for high performance energy storage.

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Publication details

The article was received on 03 Dec 2018, accepted on 05 Feb 2019 and first published on 07 Feb 2019


Article type: Paper
DOI: 10.1039/C8TA11620B
Citation: J. Mater. Chem. A, 2019, Accepted Manuscript

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    Boosting the Supercapacitor Performance of Activated Carbon by Constructing Overall Conductive Networks Using Graphene Quantum Dots

    Y. Qing, Y. Jiang, H. Lin, L. Wang, A. Liu, Y. Cao, R. Sheng, Y. Guo, C. Fan, S. Zhang, D. Jia and Z. Fan, J. Mater. Chem. A, 2019, Accepted Manuscript , DOI: 10.1039/C8TA11620B

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