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

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Title
MnO2 nanostructures with three-dimensional (3D) morphology replicated from diatoms for high-performance supercapacitors
Author
Li,FeiXing, YuanHuang, MingLi, Kai LinYu, Ting TingZhang, Yu XinLosic, Dusan
Issue Date
2015-04
Publisher
ROYAL SOC CHEMISTRYROYAL SOC CHEMISTRY
Citation
JOURNAL OF MATERIALS CHEMISTRY A, v.3, no.15, pp.7855 - 7861
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. ⓒ The Royal Society of Chemistry 2015
URI
https://scholarworks.unist.ac.kr/handle/201301/11503
URL
http://pubs.rsc.org/en/Content/ArticleLanding/2015/TA/C5TA00634A#!divAbstract
DOI
10.1039/c5ta00634a
ISSN
2050-7488
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