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SCIENCE CHINA Materials, Volume 61 , Issue 9 : 1167-1176(2018) https://doi.org/10.1007/s40843-017-9231-7

Hierarchical mesoporous Co3O4@ZnCo2O4 hybrid nanowire arrays supported on Ni foam for high-performance asymmetric supercapacitors

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  • ReceivedDec 11, 2017
  • AcceptedFeb 10, 2018
  • PublishedMar 7, 2018

Abstract

In this paper, hierarchical mesoporous Co3O4@ZnCo2O4 hybrid nanowire arrays (NWAs) on Ni foam were prepared through a two-step hydrothermal process associated with successive annealing treatment. The Co3O4@ZnCo2O4 hybrid NWAs exhibited excellent electrochemical performances with a high specific capacity of 1,240.5 C g−1 at a current density of 2 mA cm−2, with rate capability of 59.0% shifting from 2 to 30 mA cm−2, and only a 9.1% loss of its capacity even after 3,000 cycles at a consistent current density of 10 mA cm−2. An asymmetric supercapacitor (Co3O4@ZnCo2O4 NWAs||activated carbon) was fabricated and exhibited a high specific capacity of 168 C g−1 at a current density of 1 A g−1. And a preferable energy density of 37.3 W h kg−1 at a power density of 800 W kg−1 was obtained. The excellent electrochemical performances indicate the promising potential application of the hierarchical mesoporous Co3O4@ZnCo2O4 hybrid NWAs in energy storage field.


Funded by

the National Natural Science Foundation of China(51571072)

the Fundamental Research Funds for the Central Universities(AUGA5710012715)

China Postdoctoral Science Foundation(2015M81436)

Heilongjiang Postdoctoral Science Foundation(LBH-Z15065)


Acknowledgment

This work was supported by the National Natural Science Foundation of China (51571072), the Fundamental Research Funds for the Central Universities (AUGA5710012715), China Postdoctoral Science Foundation (2015M81436) and Heilongjiang Postdoctoral Science Foundation (LBH-Z15065).


Interest statement

The authors declare no conflict of interest.


Contributions statement

Li M, Yang W and Yu Y designed the research. Li M fabricated the materials and devices, analyzed the results, and wrote the manuscript with support from Huang Y. Yu Y and Yang W supervised the project and revised the manuscript. All authors contributed to the general discussion.


Author information

Menggang Li received his Master’s degree from Harbin Institute of Technology in 2017. Currently, he is a PhD candidate at the School of Chemistry and Chemical Engineering, Harbin Institute of Technology, China. His current research interest focuses on the synthesis and design of functional nanomaterials.


Weiwei Yang earned her PhD degree in Chemistry from Jilin University in 2008. Then, she worked at the University of Nebraska-Lincoln (2008–2011) as a postdoctoral researcher and also at Brown University (2012–2013) as a visiting scholar. She joined Harbin Institute of Technology in 2012, and is now an Associate Professor of the School of Chemistry and Chemical Engineering. Her research interests include the design and chemical synthesis of functional nanoparticles, and their electrochemical and energy-related applications.


Yongsheng Yu received his PhD in Materials Chemistry and Physics from Harbin Institute of Technology in 2010. He was a postdoctoral researcher at Brown University (2011–2013) and University of Nebraska-Lincoln (2013–2014), respectively. He joined the School of Chemistry and Chemical Engineering of Harbin Institute of Technology in 2014 as a Professor. His research interests are in nanomaterials synthesis, self-assembly, and applications in catalysis and energy storage.


Supplement

Supplementary information

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


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  • Figure 1

    XRD patterns of Ni foam, hierarchical mesoporous Co3O4 NWAs and Co3O4@ZnCo2O4 hybrid NWAs on Ni foam.

  • Scheme 1

    Schematic illustration of the fabrication processes of the hierarchical mesoporous Co3O4@ZnCo2O4 hybrid NWAs.

  • Figure 2

    SEM images of (a–c) hierarchical mesoporous Co3O4 NWAs and (d−f) Co3O4@ZnCo2O4 hybrid NWAs on Ni foam with different magnification.

  • Figure 3

    Typical TEM images of (a) Co3O4 NWA, (b) Co3O4@ZnCo2O4 hybrid NWA, (c) HRTEM image and (d–g) EDS mapping images of the Co3O4@ZnCo2O4 hybrid NWA.

  • Figure 4

    (a) CV curves of Ni foam, the obtained Co3O4 NWAs and Co3O4@ZnCo2O4 hybrid NWAs electrodes at a scan rate of 10 mV s−1; (b) CV curves of Co3O4@ZnCo2O4 hybrid NWAs electrode at different scan rates; (c) GCD curves of Co3O4@ZnCo2O4 hybrid NWAs electrode at different current densities; (d) specific capacities of Co3O4 NWAs and Co3O4@ZnCo2O4 hybrid NWAs electrodes at different current densities; (e) EIS of Co3O4 NWAs and Co3O4@ZnCo2O4 hybrid NWAs electrodes at open circuit potential (insert shows the equivalent circuit diagram) and (f) cycling performances of Co3O4 NWAs and Co3O4@ZnCo2O4 hybrid NWAs electrodes at the current density of 10 mA cm−2.

  • Figure 5

    (a) CV curves of AC and Co3O4@ZnCo2O4 hybrid NWAs electrodes at the scan rate of 10 mV s−1; (b) CV curves of Co3O4@ZnCo2O4||AC ASCs at different scan rates; (c) GCD curves of Co3O4@ZnCo2O4||AC ASCs at different current densities; (d) specific capacities at different current densities; (e) Ragone plots of the Co3O4@ZnCo2O4||AC ASCs and (f) cycling performance of Co3O4@ZnCo2O4||AC ASCs at a current density of 5 A g−1 (inset shows a yellow LED powered by the device).

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