Nitrogen-enriched carbon spheres coupled with graphitic carbon nitride nanosheets for high performance supercapacitors

Three-dimensional (3D) nitrogen-doped carbon materials with a hierarchically porous structure are prepared by the introduction of nitrogen-doped carbon spheres (NCS) into the inter-sheet spaces of graphitic carbon nitride nanosheets (g-CN). The as-prepared graphitic carbon nitride/nitrogen-doped car...

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Bibliographic Details
Published in:Dalton transactions : an international journal of inorganic chemistry 2018, Vol.47 (29), p.9724-9732
Main Authors: Zhu, Jun, Kong, Lirong, Shen, Xiaoping, Zhou, Hu, Zhu, Guoxing, Ji, Zhenyuan, Xu, Keqiang, Shah, Sayyar Ali
Format: Article
Language:English
Subjects:
Capacitance
Carbon
Carbon nitride
Doping
Electrodes
Energy storage
Flux density
Levels
Nanosheets
Nitrogen
Performance enhancement
Porous materials
Supercapacitors
Three dimensional composites
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Summary:Three-dimensional (3D) nitrogen-doped carbon materials with a hierarchically porous structure are prepared by the introduction of nitrogen-doped carbon spheres (NCS) into the inter-sheet spaces of graphitic carbon nitride nanosheets (g-CN). The as-prepared graphitic carbon nitride/nitrogen-doped carbon sphere (g-CN/NCS) composites present a high nitrogen doping level, a unique hierarchically porous structure, and a high specific surface area of 448 m2 g-1. Such particular features make the g-CN/NCS composite an ideal material for supercapacitor electrodes, which could deliver a large specific capacitance of 403.6 F g-1 at 0.1 A g-1, an excellent rate capability of 220 F g-1 at 10 A g-1, and a high cycling stability with almost 100% capacitance retention after 5000 cycles at 20 A g-1. Furthermore, the g-CN/NCS electrode-based symmetric supercapacitors exhibit a decent energy density of 6.75 W h kg-1 at a power density of 1000 W kg-1. The enhanced performances are mainly attributed to the high nitrogen doping level and the hierarchically porous structure of the 3D structured g-CN/NCS composites, which provide an efficient pathway for transporting ions and electrons, and endow more active sites for electrochemical energy storage.
ISSN:1477-9226
1477-9234
DOI:10.1039/c8dt01549j