Issue 15, 2015

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

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

Supplementary files

Article information

Article type
Paper
Submitted
06 ربيع الثاني 1436
Accepted
06 جمادى الأولى 1436
First published
06 جمادى الأولى 1436

J. Mater. Chem. A, 2015,3, 7855-7861

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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