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Facile synthesis of 3D nitrogen-doped graphene aerogel nanomeshes with hierarchical porous structures for applications in high-performance supercapacitors

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Abstract

3D nitrogen-doped graphene aerogel nanomeshes (N-GANMs) with hierarchical porous structures were facilely synthesized from graphene oxide and urea using iron nitrate as the etching agent. The resulting materials were characterized by scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), Raman spectroscopy, and N2 adsorption–desorption. The supercapacitor performance was characterized by cyclic voltammetry, galvanostatic charge discharge, and electrochemical impedance spectroscopy, respectively. Compared with the bare graphene aerogel (GA), N-GANMs showed higher specific surface area, more abundant meso-macroporous pores, and much better electrochemical properties. The specific capacitance of N-GANMs was as high as 345.8 F g−1, which was much higher than that of GA and most of the reported carbon-based materials, and the value remains at about 321.0 F g−1 over 2000 cycles at 1.0 A g−1 in 2.0 M KOH. In addition, the N-GANMs demonstrated a high energy density of 20.82 W h kg−1 at a power density of 449.97 W kg−1 and their cycle performance remained approximately 100% after 10 000 cycles at 5.0 A g−1 in 1.0 M Na2SO4. The excellent behaviors might have originated from their hierarchical porous structures and the incorporation of nitrogen.

Graphical abstract: Facile synthesis of 3D nitrogen-doped graphene aerogel nanomeshes with hierarchical porous structures for applications in high-performance supercapacitors

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Publication details

The article was received on 07 Feb 2017, accepted on 06 May 2017 and first published on 08 May 2017


Article type: Paper
DOI: 10.1039/C7NJ00440K
Citation: New J. Chem., 2017, Advance Article
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    Facile synthesis of 3D nitrogen-doped graphene aerogel nanomeshes with hierarchical porous structures for applications in high-performance supercapacitors

    X. Su, M. Cheng, L. Fu, G. Zheng, X. Zheng, J. Yang and X. Guan, New J. Chem., 2017, Advance Article , DOI: 10.1039/C7NJ00440K

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