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Issue 4, 2015
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Self-assembled three-dimensional hierarchical graphene hybrid hydrogels with ultrathin β-MnO2 nanobelts for high performance supercapacitors

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Abstract

We report a facile method to assemble a hierarchical and interconnected reduced graphene oxide/β-MnO2 (rGO/β-MnO2) nanobelt hybrid hydrogel by dispersion of presynthesized ultrathin β-MnO2 nanobelts (NBs) in graphene oxide (GO) precursor solution by a hydrothermal reaction. The microscopic structure of the three-dimensional (3D) hybrid hydrogel can be controlled by adjusting the content of the ultrathin β-MnO2 NBs, which exhibits the properties of low density, large specific surface area, and high compressive strength for the corresponding aerogel. Importantly, a typical hybrid hydrogel with 54.2% ultrathin β-MnO2 NBs displays a specific capacitance as high as 362 F g−1 at a current density of 1.0 A g−1, and even 282 F g−1 at 20 A g−1, which is three times higher than that of the pure rGO hydrogel (118 F g−1). Meanwhile, the typical hybrid hydrogel also shows outstanding cycling stability with 96.3% capacitance retention after 10 000 cycles of cyclic voltammetry (CV) scans. These findings open up the use of ultrathin NBs for the self-assembly of hybrid hydrogels as high performance supercapacitor devices in energy storage and conversion.

Graphical abstract: Self-assembled three-dimensional hierarchical graphene hybrid hydrogels with ultrathin β-MnO2 nanobelts for high performance supercapacitors

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Supplementary files

Article information


Submitted
18 Sep 2014
Accepted
10 Nov 2014
First published
02 Dec 2014

J. Mater. Chem. A, 2015,3, 1540-1548
Article type
Paper

Self-assembled three-dimensional hierarchical graphene hybrid hydrogels with ultrathin β-MnO2 nanobelts for high performance supercapacitors

S. Zhu, H. Zhang, P. Chen, L. Nie, C. Li and S. Li, J. Mater. Chem. A, 2015, 3, 1540
DOI: 10.1039/C4TA04921G

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