Abstract
Novel hollow Ni0.2Mn0.8O1.5 twin microspheres were synthesized through a facile solvothermal reaction followed by calcination. The prepared hollow twin microspheres were composed of a large number of aggregated nanoparticles, with many pores homogeneously distributed across the whole of the twin microspheres. Benefiting from such structural advantages, such as the void core and high porosity, the prepared hollow Ni0.2Mn0.8O1.5 twin microspheres, as an electrode for supercapacitors, exhibited remarkable electrochemical performance with a large specific capacitance (491 F g−1 at 0.5 A g−1), desirable rate capability (81% of capacity retention at 5 A g−1), and excellent cycling stability (94.6% of the initial capacity after 2000 cycles). Moreover, a fabricated asymmetric supercapacitor cell based on Ni0.2Mn0.8O1.5 and active carbon demonstrated an energy density of 19.5 Wh kg−1 at a power density of 799 W kg−1, suggesting a promising practical application for these microspheres in supercapacitors.
Graphical Abstract
Novel hollow Ni0.2Mn0.8O1.5 twin microspheres have been synthesized based on the oriented attachment and Ostwald ripening effects, demonstrating high energy density and power density for the promising application in energy storage devices.
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Acknowledgements
The authors gratefully acknowledge the financial supports from the Natural Science Foundation of Hebei Province (Grant No. B2017402110 and E2015402111), Top Young Talents of Higher Learning Institutions of Hebei Province (Grant No. BJ2016009), and The Scientific Research and Development Program of Handan City (Grant No. 1621211040).
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Liu, A., Lv, Y., Mu, J. et al. Facile synthesis of hollow Ni0.2Mn0.8O1.5 twin microspheres for electrochemical energy storage. J Appl Electrochem 48, 15–26 (2018). https://doi.org/10.1007/s10800-017-1130-x
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DOI: https://doi.org/10.1007/s10800-017-1130-x