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Issue 24, 2018
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Electrolyte-assisted hydrothermal synthesis of holey graphene films for all-solid-state supercapacitors

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Abstract

A novel strategy was presented for the synthesis of graphene-based film electrodes by electrolyte-induced hydrothermal reduction of holey graphene oxide based films. After hydrothermal treatment, the reduced holey graphene films (rHGFs) maintained their flexibility, integrity and porosity, which resulted from the electrolyte-induced balance between electrostatic repulsion and π–π attraction. The trapped electrolyte (H2SO4) between graphene layers can prevent aggregation, and the resulting supercapacitor exhibits a high specific capacitance in the sulfuric acid electrolyte. Benefitting from the in-plane pores and oxygen-containing groups on graphene sheets, the rHGF electrode exhibits a high specific capacitance of 260 F g−1 (297 F cm−3) with remarkable rate performance in a three-electrode system. To evaluate the practical application, flexible all-solid-state supercapacitors based on the rHGF electrode with PVA/H2SO4 gel electrolyte were prepared, and the device exhibits remarkable cycling stability. The areal capacitance and volumetric energy density were 56 mF cm−2 and 1.41 W h cm−3, respectively. This work demonstrated a cost-effective and simple technique to prepare compact graphene films with continuous ion channels and showed great importance on the design of flexible, portable and highly integrated supercapacitors.

Graphical abstract: Electrolyte-assisted hydrothermal synthesis of holey graphene films for all-solid-state supercapacitors

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Publication details

The article was received on 20 Mar 2018, accepted on 16 May 2018 and first published on 16 May 2018


Article type: Paper
DOI: 10.1039/C8TA02580K
Citation: J. Mater. Chem. A, 2018,6, 11471-11478
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    Electrolyte-assisted hydrothermal synthesis of holey graphene films for all-solid-state supercapacitors

    D. Liu, Q. Li and H. Zhao, J. Mater. Chem. A, 2018, 6, 11471
    DOI: 10.1039/C8TA02580K

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