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Issue 20, 2014
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Designing thermal and electrochemical oxidation processes for δ-MnO2 nanofibers for high-performance electrochemical capacitors

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Abstract

To date, the phase of electrospun MnOx nanofibers (NFs) after thermal calcination has been limited to the low oxidation state of Mn (x < 2), which has resulted in insufficient specific capacitance. The organic contents in the as-spun MnOx NFs, which are essential for forming the NF structure, make it difficult to obtain the optimum phase (MnO2) to achieve high electrochemical performance. Herein, δ-MnO2 NFs, which were obtained by galvanostatic oxidation of thermally calcined MnOx NFs, were successfully fabricated while maintaining the 1-D nanoscale structure and inhibiting loss of the active materials. The galvanostatically oxidized Mn3O4 exhibited an outstanding performance of 380 F g−1 under a mass loading of 1.2 mg cm−2. The effect of galvanostatic oxidation was strongly dependent on the concentration and energetic stability of the Mn2+/3+ ions in the MnOx phases.

Graphical abstract: Designing thermal and electrochemical oxidation processes for δ-MnO2 nanofibers for high-performance electrochemical capacitors

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Supplementary files

Article information


Submitted
21 Jan 2014
Accepted
25 Feb 2014
First published
26 Feb 2014

J. Mater. Chem. A, 2014,2, 7197-7204
Article type
Paper
Author version available

Designing thermal and electrochemical oxidation processes for δ-MnO2 nanofibers for high-performance electrochemical capacitors

J. Lee, T. Yang, H. Kang, D. Nam, N. Kim, Y. Lee, S. Lee and Y. Joo, J. Mater. Chem. A, 2014, 2, 7197
DOI: 10.1039/C4TA00342J

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