Fabricating reduced graphene oxide films with high volumetric capacitive performances via thermal and acid treatment

Fabricating reduced graphene oxide films with high volumetric capacitive performances via thermal... Considering the growing requirement for high-performance energy storage devices, active electrode materials with high volumetric performance are urgently needed, but only few reports devote to the preparation of reduced graphene oxide (rGO) with high gravimetric specific capacitance (C g) and volumetric specific capacitance (C v). Here, the thermally treated dense rGO films are further treated with concentrated sulfuric acid to achieve the high C g, C v and cycling stability. The optimal film possesses high density of about 2.04 g cm−3 and exhibits the maximal C g and C v of about 242.3 F g−1 and 494.3 F cm−3 in 1.0 mol L−1 H2SO4 electrolyte based on the two-electrode testing system. Furthermore, the optimal film shows excellent cycling stability in 1.0 mol L−1 H2SO4 (90.2% capacitance retention after 10000 cycles) and excellent rate capability. It is believed that this strategy can be developed as an effective process to prepare rGO-based materials with high capacitive performance for compact energy storage device. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Journal of Materials Science Springer Journals

Fabricating reduced graphene oxide films with high volumetric capacitive performances via thermal and acid treatment

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Publisher
Springer US
Copyright
Copyright © 2018 by Springer Science+Business Media, LLC, part of Springer Nature
Subject
Materials Science; Materials Science, general; Characterization and Evaluation of Materials; Polymer Sciences; Continuum Mechanics and Mechanics of Materials; Crystallography and Scattering Methods; Classical Mechanics
ISSN
0022-2461
eISSN
1573-4803
D.O.I.
10.1007/s10853-018-2424-z
Publisher site
See Article on Publisher Site

Abstract

Considering the growing requirement for high-performance energy storage devices, active electrode materials with high volumetric performance are urgently needed, but only few reports devote to the preparation of reduced graphene oxide (rGO) with high gravimetric specific capacitance (C g) and volumetric specific capacitance (C v). Here, the thermally treated dense rGO films are further treated with concentrated sulfuric acid to achieve the high C g, C v and cycling stability. The optimal film possesses high density of about 2.04 g cm−3 and exhibits the maximal C g and C v of about 242.3 F g−1 and 494.3 F cm−3 in 1.0 mol L−1 H2SO4 electrolyte based on the two-electrode testing system. Furthermore, the optimal film shows excellent cycling stability in 1.0 mol L−1 H2SO4 (90.2% capacitance retention after 10000 cycles) and excellent rate capability. It is believed that this strategy can be developed as an effective process to prepare rGO-based materials with high capacitive performance for compact energy storage device.

Journal

Journal of Materials ScienceSpringer Journals

Published: Jun 5, 2018

References

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