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Issue 24, 2015
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A regular, compact but microporous packing structure: high-density graphene assemblies for high-volumetric-performance supercapacitors

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Abstract

Conventional graphene powder materials exhibit ultralow density characteristics, severely restricting their practical application. For addressing this issue, we propose a facile but efficient strategy for optimization of the graphene packing structure. Through the electrostatic orientation effect of K+ ions, a highly regular and compact graphene assembly with a high density is fabricated, at the same time, interlayer micropores are preserved due to the separation effect of K+ ions intercalated between graphene layers, optimizing the delicate balance between the dense and porous characteristics of graphene. Besides, good wettability to electrolytes and Faradaic pseudo-capacitance further improve the capacitive performances. Accordingly, a volumetric capacitance as high as 508 F cm−3 is achieved for the produced graphene film, which is the highest value for carbon-based electrode materials in aqueous electrolytes to date. Furthermore, the unique packing structure is retained for the graphene assembly in a powder form, and the symmetric two-electrode supercapacitors based on the produced graphene powder material with a mass loading density of 6–8 mg cm−2, close to the value of commercial supercapacitors, exhibit a good high-rate capability and a volumetric energy density as high as 30.2 W h L−1.

Graphical abstract: A regular, compact but microporous packing structure: high-density graphene assemblies for high-volumetric-performance supercapacitors

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Supplementary files

Article information


Submitted
07 Feb 2015
Accepted
10 Mar 2015
First published
11 Mar 2015

J. Mater. Chem. A, 2015,3, 12653-12662
Article type
Paper

A regular, compact but microporous packing structure: high-density graphene assemblies for high-volumetric-performance supercapacitors

D. Liu, Z. Jia, J. Zhu and D. Wang, J. Mater. Chem. A, 2015, 3, 12653
DOI: 10.1039/C5TA01024A

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