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

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...

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Bibliographic Details
Published in:Journal of materials chemistry. A, Materials for energy and sustainability Materials for energy and sustainability, 2019-01, Vol.7 (2), p.693
Main Authors: Li, Shengyuan, Wang, Ting, Zhu, Wangqin, Lian, Jiabiao, Huang, Yunpeng, Yang-Yang, Yu, Qiu, Jingxia, Zhao, Yan, Yang-Chun, Yong, Li, Huaming
Format: Article
Language:English
Subjects:
Capacitance
Carbon nitride
Chemical synthesis
Cycles
Electrochemical analysis
Electrochemistry
Energy conversion
Energy storage
Flux density
Graphene
Hydrogen production
Hydrogen storage
Lithium
Lithium ions
Mapping
Nanocomposites
Niobium oxides
Specific capacity
Stability
Supercapacitors
Synergistic effect
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Summary: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.
ISSN:2050-7488
2050-7496
DOI:10.1039/c8ta10239b