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Issue 39, 2011
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Porous manganese oxide generated from lithiation/delithiation with improved electrochemical oxidation for supercapacitors

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Abstract

For manganese oxides with low manganese oxidation states, such as MnO or Mn3O4, the electrochemical oxidation during potential cycling is critical to achieve high supercapacitor performance. In this work, dense Mn3O4 thin films are prepared by pulsed laser deposition. An electrochemical lithiation/delithiation process is applied to the Mn3O4 thin film, which leads to a nanoporous structure of the film and greatly increases the porosity of the film. The nanoporous MnOx thin film electrode exhibits significantly improved supercapacitive performance compared to the as-prepared Mn3O4 thin film electrode. After 1000 cyclic voltammetric scans in 1 M Na2SO4 electrolyte between 0 and 1 V, only part of the surface of the as-prepared Mn3O4 thin film transforms into a MnO2 porous structure while the complete film of the nanoporous MnOx transforms into a MnO2 porous structure. It is believed that the nanoporous structure, which facilitates the electrolyte penetration, leads to the completion of electrochemical oxidation through the film during the potential cycling, resulting in promising supercapacitive performance of the film.

Graphical abstract: Porous manganese oxide generated from lithiation/delithiation with improved electrochemical oxidation for supercapacitors

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Supplementary files

Article information


Submitted
16 Jun 2011
Accepted
03 Aug 2011
First published
25 Aug 2011

J. Mater. Chem., 2011,21, 15521-15526
Article type
Paper

Porous manganese oxide generated from lithiation/delithiation with improved electrochemical oxidation for supercapacitors

H. Xia, Y. S. Meng, X. Li, G. Yuan and C. Cui, J. Mater. Chem., 2011, 21, 15521
DOI: 10.1039/C1JM12767E

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