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A confinement strategy to prepare N-doped reduced graphene oxide foams with desired monolithic structures for supercapacitors

Abstract

It is a challenge to achieve pure graphene foams with a desired monolithic structure in order to take advantage of the excellent properties of graphene-based macroscopic assemblies. Here, we introduced a confinement fabrication strategy to prepare nitrogen doped reduced graphene oxide foams (NrGF) through one-step hydrothermal process. The melamine foam (MF) skeleton was removed during the hydrothermal reaction, and the NrGF kept its desired monolithic structures by the confinement of solution ionic strength. Due to the “roof-tile-like” microscopic morphology with high N-doping (9.88 at%), the free-standing graphene foam electrode exhibited excellent capacitive performance. The resulting NrGF-based symmetric supercapacitor displayed a remarkably enhanced specific capacitance of 260 F g−1 at 0.1 A g−1, and 173 F g−1 at 20 A g−1 in aqueous electrolyte. Moreover, the facility of fabrication makes it a promising material in many context for large scale production, such as energy storage, environmental remediation and strain sensors. Furthermore, this synthesis strategy can be expanded to prepare other pure macroporous foams or composites by using different building blocks (such as CNTs, MXene).

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Publication details

The article was received on 07 Dec 2018, accepted on 09 Feb 2019 and first published on 13 Feb 2019


Article type: Paper
DOI: 10.1039/C8NR09914F
Citation: Nanoscale, 2019, Accepted Manuscript

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    A confinement strategy to prepare N-doped reduced graphene oxide foams with desired monolithic structures for supercapacitors

    D. Liu, Q. Li, S. Li, J. Hou and H. Zhao, Nanoscale, 2019, Accepted Manuscript , DOI: 10.1039/C8NR09914F

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