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Three-dimensional nitrogen and phosphorus co-doped carbon quantum dots/reduced graphene oxide composite aerogels with a hierarchical porous structure as superior electrode materials for supercapacitors

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Abstract

Carbon quantum dot (CQD)-based electrode materials as a novel kind of emerging materials have recently received increasing interest owing to their many unique properties. Herein, graphitic CQDs are synthesized by a modified chemical oxidation approach, and further utilized as the intercalator to prepare novel three-dimensional (3D) N, P co-doped CQDs/reduced graphene oxide (rGO) composite aerogels (N, P-CQDs/rGO) by a one-step hydrothermal approach. When used as an electrode material for supercapacitors for the first time, the as-obtained N, P-CQDs/rGO exhibits a notably enhanced specific capacitance (453.7 F g−1 at 1 A g−1) compared with GO, rGO, N, P-rGO and CQDs/rGO. Moreover, the as-synthesized N, P-CQDs/rGO presents excellent rate properties (69.5% of capacitance retention at 50 A g−1) and cycle performance (93.5% of capacity retention at 10 A g−1 over 10 000 cycles). The good capacitive behaviors can be ascribed to the synergistic effect of N, P co-doping modification, the introduction of CQDs and the unique 3D porous aerogel structure with a large specific surface area, hierarchical porous structure and superior electrical conductivity. In addition, a symmetrical device is assembled based on the N, P-CQDs/rGO composite aerogel, achieving a high energy density of 15.69 W h kg−1 at a power density of 325 W kg−1, and superior cycle stability with 85.5% of capacitance retention at 5 A g−1 over 10 000 cycles. This current work can offer a promising strategy for the design and development of novel and high-performance 3D CQD-based composite aerogels for application in supercapacitors and other energy storage systems.

Graphical abstract: Three-dimensional nitrogen and phosphorus co-doped carbon quantum dots/reduced graphene oxide composite aerogels with a hierarchical porous structure as superior electrode materials for supercapacitors

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Publication details

The article was received on 27 Jul 2019, accepted on 12 Sep 2019 and first published on 16 Sep 2019


Article type: Paper
DOI: 10.1039/C9TA08151H
J. Mater. Chem. A, 2019, Advance Article

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    Three-dimensional nitrogen and phosphorus co-doped carbon quantum dots/reduced graphene oxide composite aerogels with a hierarchical porous structure as superior electrode materials for supercapacitors

    J. Li, X. Yun, Z. Hu, L. Xi, N. Li, H. Tang, P. Lu and Y. Zhu, J. Mater. Chem. A, 2019, Advance Article , DOI: 10.1039/C9TA08151H

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