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Issue 15, 2015
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MnO2 nanostructures with three-dimensional (3D) morphology replicated from diatoms for high-performance supercapacitors

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Abstract

Herein, we demonstrate the synthesis of size- and shape-controlled MnO2 nanostructures by replica molding from diatom silica structures for high-performance supercapacitors. Three types of hierarchical hollow MnO2 patterns with different three-dimensional (3D) structures, shapes and large surface areas were successfully prepared from three diatom species by a template-assisted hydrothermal process. The extraordinary precision and nano-scale resolution of 3D replications of complex biological architecture from diatoms to artificial MnO2 structures are confirmed. Detailed electrochemical measurements reveal that the Melosira-type MnO2 pattern exhibits not only a high specific capacitance of 371.2 F g−1 at a scan rate of 0.5 A g−1, but also relatively good cycle stability (93.1% capacitance retention after 2000 cycles at a scan rate of 5 A g−1), demonstrating a promising application as supercapacitor electrode materials.

Graphical abstract: MnO2 nanostructures with three-dimensional (3D) morphology replicated from diatoms for high-performance supercapacitors

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Supplementary files

Article information


Submitted
26 Jan 2015
Accepted
25 Feb 2015
First published
25 Feb 2015

J. Mater. Chem. A, 2015,3, 7855-7861
Article type
Paper
Author version available

MnO2 nanostructures with three-dimensional (3D) morphology replicated from diatoms for high-performance supercapacitors

F. Li, Y. Xing, M. Huang, K. L. Li, T. T. Yu, Y. X. Zhang and D. Losic, J. Mater. Chem. A, 2015, 3, 7855
DOI: 10.1039/C5TA00634A

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