Abstract
This work details the design and synthesis of novel urchin-like α-FeOOH@MnO2 core–shell hollow microspheres for high-performance electrode materials for supercapacitors. The core–shell heterostructures were constructed by growing strip-like MnO2 nanostructures onto the urchin-like α-FeOOH hollow microspheres that were composed of nanorods. Based on the synergetic effects and multi-functionalities of both the MnO2 shell and urchin-like α-FeOOH hollow cores, the resulting urchin-like α-FeOOH@MnO2 core–shell hollow microspheres exhibited excellent electrochemical performance with a high specific capacitance of 597 F g−1 at 1 A g−1, good rate capability (capacitance retention of 74.2% at 10 A g−1), and remarkable cycling stability (capacitance retention of 97.1% after 2000 cycles). Moreover, an asymmetric supercapacitor fabricated using α-FeOOH@MnO2 as positive electrode and activated carbon as negative electrode was found to deliver a high energy density of 34.2 W h kg−1 and power density of 815 W kg−1.
Graphical Abstract
Urchin-like α-FeOOH@MnO2 hollow microspheres demonstrated a high specific capacitance, rate capability and cycling stability, suggesting its promising potential for high-performance supercapacitors.
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Acknowledgements
The authors gratefully acknowledge the financial supports from the National Natural Science Foundation of China (Grant Nos. 21206025 and 51405131) and the Natural Science Foundation of Hebei Province (Grant Nos. B2013402008 and E2015402088).
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Lv, Y., Che, H., Liu, A. et al. Urchin-like α-FeOOH@MnO2 core–shell hollow microspheres for high-performance supercapacitor electrode. J Appl Electrochem 47, 433–444 (2017). https://doi.org/10.1007/s10800-017-1051-8
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DOI: https://doi.org/10.1007/s10800-017-1051-8