Jump to main content
Jump to site search


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

Abstract

A novel strategy was presented for the synthetic of graphene-based film electrodes by electrolyte-induced hydrothermal reduction of holey graphene oxide based films. After hydrothermal treatment, reduced holey graphene film (rHGF) maintained flexibility, integrity and porosity, which resulted from the electrolyte-induced balance between electrostatic repulsion and π–π attraction. The trapping electrolyte (H2SO4) between graphene layers can prevent the 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, the flexible all-solid-state supercapacitors based on rHGF electrode with PVA/H2SO4 gel electrolyte was prepared, and the device exhibits remarkable cycling stability. The areal capacitance and volumetric energy density was 56 mF cm−2 and 1.41W h cm−3, respectively. This work demonstrated a cost-effective and simple technique to prepare compact graphene films with a continuous ion channels, and showed great importance on the design of flexible, portable and highly integrated supercapacitors.

Back to tab navigation

Supplementary files

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, Accepted Manuscript
  •   Request permissions

    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, Accepted Manuscript , DOI: 10.1039/C8TA02580K

Search articles by author

Spotlight

Advertisements