Abstract
In this work, porous NiMn2O4 nanosheets with large surface areas are successfully grown by a hydrothermal method and examined as electrodes for supercapacitors. Results have shown that the supercapacitor based on NiMn2O4 electrodes exhibits the highest specific capacitance of 1321.6 F g−1 at a scan rate of 2 A g−1, much higher than those of other supercapacitors made of metal oxides and composites. The NiMn2O4 supercapacitor also shows a good cycling behavior, only 6.5 % capacitance decay after 1500 cycles. The NiMn2O4 nanosheets possess a robust mechanical adhesion to Ni foam, which has been demonstrated by an ultrasonication test.
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Acknowledgments
This work is financially supported by the National Natural Science Foundation of China (Nos. U1304108 and U1204501), the Science and Technology Key Projects of Education Department Henan Province (No. 13A430758), the Natural Scientific Foundation of Hunan Province (No. 13JJ4080), and the Young Backbone Teacher of Xinyang Normal University (No. 2013GGJS-18). The authors are indebted to Dr D. L. Xu and Y. X. Liu for their technical assistance and kind help.
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Hailong Yan and Tong Li contributed equally to this work.
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Yan, H., Li, T., Qiu, K. et al. Growth and electrochemical performance of porous NiMn2O4 nanosheets with high specific surface areas. J Solid State Electrochem 19, 3169–3175 (2015). https://doi.org/10.1007/s10008-015-2946-0
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DOI: https://doi.org/10.1007/s10008-015-2946-0