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Optimal structuring of nitrogen-doped hybrid-dimensional nanocarbons for high-performance flexible solid-state supercapacitors

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Abstract

The rapid development of wearable electronics has increased the demand for high-performance flexible power-supply devices for enhancing portability and durability. Flexible solid-state supercapacitors (FSSSCs) could have potential to fulfill this demand, but engineering electrode materials is still a challenging issue. Herein, we demonstrate optimal structuring of nitrogen-doped hybrid-dimensional nanocarbons (N-RGO–CNT–CBNP) for high-performance FSSSCs. Three types of representative nanocarbons including reduced graphene oxide nanosheets, carbon nanotubes and carbon black nanoparticles are explored as building blocks to construct N-RGO–CNT–CBNP synergistically via facile and low-cost solution processing. With melamine as both a structure-directing agent and a highly effective nitrogen source, a highly-porous three-dimensional hierarchical structure and a high nitrogen doping level of 13.8 at% are simultaneously achieved. Such a nanostructured material is employed to fabricate sandwich-structured papers (N-RGO–CNT–CBNP-Ps) with high flexibility, conductivity and mechanical strength. The resulting N-RGO–CNT–CBNP-Ps possess an ultrahigh areal specific capacitance (935 mF cm−2 at 1 mA cm−2), as well as a remarkable rate capability (e.g. 580 mF cm−2 at 100 mA cm−2) and cycling stability (e.g. 91.6% retention even after 40 000 cycles at 50 mA cm−2). An N-RGO–CNT–CBNP-P based FSSSC displays both high energy density and power density, while satisfying operational reliability/durability requirements. The results indicate that the N-RGO–CNT–CBNP-P based FSSSCs hold promise towards their practical applications in wearable electronics.

Graphical abstract: Optimal structuring of nitrogen-doped hybrid-dimensional nanocarbons for high-performance flexible solid-state supercapacitors

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Publication details

The article was received on 21 Nov 2018, accepted on 18 Jan 2019 and first published on 21 Jan 2019


Article type: Paper
DOI: 10.1039/C8TA11206A
Citation: J. Mater. Chem. A, 2019, Advance Article

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    Optimal structuring of nitrogen-doped hybrid-dimensional nanocarbons for high-performance flexible solid-state supercapacitors

    X. Cao, S. Jia, W. Huang, Y. Tang, J. Ø. Duus, J. Lou and Q. Chi, J. Mater. Chem. A, 2019, Advance Article , DOI: 10.1039/C8TA11206A

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