Journal
JOURNAL OF MATERIALS CHEMISTRY A
Volume 2, Issue 20, Pages 7197-7204Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c4ta00342j
Keywords
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Funding
- Converging Research Center Program through the Ministry of Science, ICT and Future Planning, Korea [2013K000206]
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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, delta-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.
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