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Issue 2, 2019
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Controllable synthesis of uniform mesoporous H-Nb2O5/rGO nanocomposites for advanced lithium ion hybrid supercapacitors

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Abstract

Controllable synthesis of uniform graphene–metal oxide nanocomposites is of great interest in energy storage applications, due to the combination of their merits and the synergistic effects on the enhancement of their electrochemical performance. Herein, we report a controllable synthesis of uniform mesoporous H-Nb2O5/rGO nanocomposites, which exhibit higher reversible specific capacity (∼190 mA h g−1), and better rate capability and cycling stability (the capacitance retention is 96.5% over 500 cycles) than pristine H-Nb2O5 microflowers, attributed to their large specific surface area (364.17 m2 g−1), porous structure, and intimate interface. More remarkably, the H-Nb2O5/rGO-based lithium ion hybrid supercapacitor (LIHS) delivered a high energy density of 100.2 W h kg−1 at 50 W kg−1 and still retained 18.3 W h kg−1 at an ultrahigh power density of 20 000 W kg−1, as well as an excellent cycling stability. It is worth noting that some other nanocomposites, including Zn2Ti3O8/rGO, Si/rGO, NaNbO3/rGO, Nb4N5/rGO, and H-Nb2O5/2D g-C3N4, have also been successfully synthesized by this method, demonstrating that it can be extended to prepare other functional nanocomposites for applications in energy conversion and storage, photocatalytic hydrogen production, sensors, and so on.

Graphical abstract: Controllable synthesis of uniform mesoporous H-Nb2O5/rGO nanocomposites for advanced lithium ion hybrid supercapacitors

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Publication details

The article was received on 24 Oct 2018, accepted on 09 Nov 2018 and first published on 08 Dec 2018


Article type: Paper
DOI: 10.1039/C8TA10239B
Citation: J. Mater. Chem. A, 2019,7, 693-703

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    Controllable synthesis of uniform mesoporous H-Nb2O5/rGO nanocomposites for advanced lithium ion hybrid supercapacitors

    S. Li, T. Wang, W. Zhu, J. Lian, Y. Huang, Y. Yu, J. Qiu, Y. Zhao, Y. Yong and H. Li, J. Mater. Chem. A, 2019, 7, 693
    DOI: 10.1039/C8TA10239B

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