Urchin-like FeOOH hollow microspheres decorated with MnO2 for enhanced supercapacitor performance

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  • ReceivedJun 14, 2017
  • AcceptedSep 15, 2017
  • PublishedOct 13, 2017


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.

Funded 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.


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.

Interest statement

The authors declare that they have no conflict of interest.

Contributions statement

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.

Author information

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.


Supplementary information

Supporting data are available in the online version of the paper.


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  • Figure 1

    SEM images of FeOOH (a, b) and FeOOH@MnO2 (c, d).

  • Figure 2

    (a) XRD patterns of FeOOH and FeOOH@MnO2; (b) TEM image of a FeOOH microsphere; (c) low-magnification and (d) high-resolution TEM image of FeOOH@MnO2; (e–h) EDS elemental mapping from several hybrid nanofibers, and (i) EDS spectrum of the FeOOH@MnO2 nanofibers shown in (e).

  • Figure 3

    (a) XPS spectrum of α-FeOOH@MnO2 and high-resolution XPS spectra of (b) Fe 2p, (c) O 1s, and (d) Mn 2p.

  • Figure 4

    (a) Comparison of CV curves of the FeOOH and FeOOH@MnO2 electrodes at scan rate of 50 mV s−1; (b) comparison of GCD curves of the FeOOH and FeOOH@MnO2 electrodes at current density of 2 A g−1; (c) CV curves of FeOOH@MnO2 at various scan rates; (d) GCD curves of FeOOH@MnO2 electrode at different current densities of 1, 2, 3, 5, 10, and 20 A g−1, respectively; (e) variation in specific capacitance with current density, and (f) cycling performance of the FeOOH and FeOOH@MnO2 electrodes for 1000 cycles at 5 A g−1.

  • Figure 5

    (a) CV curves of the FeOOH@MnO2//AC ASC at various scan rates; (b) GCD curves of FeOOH@MnO2 at various current densities; (c) the Ragone of the energy densities and power densities of FeOOH@MnO2 and the inset is schematic showing ASC device construction using FeOOH@MnO2 and AC electrodes; (d) cycling performance of FeOOH@MnO2//AC ASC measured at a current density of 10 A g−1.

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