Abstract
Ultrathin MnO2 decorated hierarchical urchin-like FeOOH hollow micro-nanospheres have been designed and synthesized through a facile hydrothermal route. The microspheres are made of FeOOH nanofibers with a diameter of 10 nm. Due to the synergetic effect between the unique FeOOH hollow micro/nanostructures and ultrathin MnO2 layer, the as-fabricated FeOOH@MnO2 hybrid electrode exhibits a high specific capacitance of 1192 F g−1 at a current density of 1 A g−1. It also reveals high rate capabilities and superior stability. Moreover, the asymmetric supercapacitor (ASC) assembled from the FeOOH@MnO2 and the active carbon (AC) delivers a high energy density of 40.2 W h kg−1 at a power density of 0.78 kW kg−1, and the energy density could remain 10.4 W h kg−1 under a condition of high power density of 11.7 kW kg−1.
摘要
本文通过简便的水热技术合成了超薄MnO2修饰的海胆状FeOOH空心微纳米球. 该微米球由直径10 nm的纳米纤维组成. 由于FeOOH独特的微纳米结构和MnO2的协同效应, 所制备的FeOOH@MnO2电极在电流密度1 A g−1下表现出1192 F g−1的比电容, 同时显示出较高的倍率性能和优异的稳定性. 而且由FeOOH@MnO2电极和活性炭组装的非对称电容器在0.78 kW kg−1的功率密度下具有40.2 W h kg−1的能量密度; 在较高的11.7 kW kg−1功率密度下, 功率密度仍能保持在10.4 W h kg−1.
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Acknowledgements
This work was supported by the National Natural Science Foundation of China (21771137), Shandong Provincial Natural Science Foundation (ZR2016BM12), the Fundamental Research Funds for the Central Universities (15CX08010A), and the starting-up fund from TJUT.
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Author contributions Du K designed and engineered the samples; Du K wrote the draft with discussion of Wei G, Zhao F, Li J, and An C. Wang H performed the SEM and XRD characterization. An CH supervised the projects and carefully reviewed and revised this manuscript. All authors contributed to the general discussion.
Conflict of interest The authors declare that they have no conflict of interest.
Supplementary information Supporting data are available in the online version of the paper.
Kun Du is currently a Master student in materials science from China University of Petroleum. Her research interests include the synthesis, characterization, and explorations of efficient catalysts in the fields of clean energy production and environmental purification.
Changhua An received his PhD degree from the University of Science and Technology of China (USTC) in 2003. In 2013, he was promoted to full professor of materials science. Now he is a professor at Tianjin University of Technology. His research interests focus on the synthesis, characterization, and explorations of efficient catalysts in the fields of clean energy production and environmental purification.
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Du, K., Wei, G., Zhao, F. et al. Urchin-like FeOOH hollow microspheres decorated with MnO2 for enhanced supercapacitor performance. Sci. China Mater. 61, 48–56 (2018). https://doi.org/10.1007/s40843-017-9122-4
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DOI: https://doi.org/10.1007/s40843-017-9122-4