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.
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Acknowledgements
This work was supported by the National Natural Science Foundation of China (Nos. 51372278, U1507106, and 51772332), the Hunan Provincial Science and Technology Plan Project (Nos. 2016TP1007 and 2017TP1001), Hunan Provincial Natural Science Foundation of China (No. 2018JJ2485), and Innovation-Driven Project of Central South University (No. 2016CXS031).
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Zhao, K., Xu, Z., He, Z. et al. Vertically aligned MnO2 nanosheets coupled with carbon nanosheets derived from Mn-MOF nanosheets for supercapacitor electrodes. J Mater Sci 53, 13111–13125 (2018). https://doi.org/10.1007/s10853-018-2562-3
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DOI: https://doi.org/10.1007/s10853-018-2562-3