Template assisted fabrication of free-standing MnO2 nanotube and nanowire arrays and their application in supercapacitors

In this Letter, an innovative technique is reported to control the fabrication of free-standing MnO2 nanotube and nanowire arrays. The synthesis is based on a three-step process, using porous anodic aluminum oxide as a template, and enables the selective fabrication of vertically aligned MnO2 nanotu...

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Bibliographic Details
Published in:Applied physics letters 2014-02, Vol.104 (5)
Main Authors: Grote, Fabian, Kühnel, Ruben-Simon, Balducci, Andrea, Lei, Yong
Format: Article
Language:English
Subjects:
Aluminum oxide
Applied physics
Arrays
Electrochemical analysis
Electrode materials
Manganese dioxide
Nanotubes
Nanowires
Supercapacitors
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Summary:In this Letter, an innovative technique is reported to control the fabrication of free-standing MnO2 nanotube and nanowire arrays. The synthesis is based on a three-step process, using porous anodic aluminum oxide as a template, and enables the selective fabrication of vertically aligned MnO2 nanotubes or nanowires on large areas. The as-prepared MnO2 nanotube and nanowire arrays are investigated as electrode materials for supercapacitor applications and show a good electrochemical performance with specific capacitances of 210 F g−1 at 1.9 A g−1 and 231 F g−1 at 0.5 A g−1, respectively. The investigation of the rate capability of both structures indicates a superior performance of the nanotube arrays.
ISSN:0003-6951
1077-3118
DOI:10.1063/1.4864285