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- Title
Vertically aligned MnO<sub>2</sub> nanosheets coupled with carbon nanosheets derived from Mn-MOF nanosheets for supercapacitor electrodes.
- Authors
Zhao, Kuangmin; Xu, Ziqin; He, Zhen; Ye, Guanying; Gan, Qingmeng; Zhou, Zhi; Liu, Suqin
- Abstract
A new approach to fabricate carbon nanosheets-supported MnO2 nanosheet arrays (MnO2/CNS) from Mn-MOF nanosheet-derived MnO/CNS through a facile low-temperature oxidation under a strong alkaline condition has been developed. This low-temperature approach to obtain the high-valence Mn species from low-valence Mn species avoids the oxidation of carbon during the conventional high-temperature synthesis. The as-prepared MnO2/CNS exhibits excellent electrochemical performance as an electrode material for supercapacitors with a maximum specific capacitance of 339 F g−1 at 0.5 A g−1 in 1 M Na2SO4 aqueous electrolyte. In addition, the MnO2/CNS displays ultrahigh stability with capacitance retention of 96.1% after 5000 charge-discharge cycles at a current density of 5 A g−1, which is superior than most of the previously reported MnO2/carbon materials. The excellent capacity and cycling stability of MnO2/CNS are mainly due to its large specific surface area and strong coupling between the in situ formed MnO2 nanosheet arrays and carbon nanosheets. This work provides a new low-temperature approach for the synthesis of high-valence metal oxides/carbon composites from MOF-derived materials for the applications such as energy storage and conversion.
- Subjects
CARBON; SUPERCAPACITORS; ELECTRODES; LOW temperatures; ELECTRIC capacity
- Publication
Journal of Materials Science, 2018, Vol 53, Issue 18, p13111
- ISSN
0022-2461
- Publication type
Article
- DOI
10.1007/s10853-018-2562-3