Construction of hierarchical ZnCo2O4@NixCo2x(OH)6x core/shell nanowire arrays for high-performance supercapacitors

Wenbin Fu; Yaling Wang; Weihua Han; Zemin Zhang; Heming Zha; Erqing Xie

doi:10.1039/C5TA07965A

Construction of hierarchical ZnCo₂O₄@Ni_xCo_2x(OH)_6x core/shell nanowire arrays for high-performance supercapacitors†

Wenbin Fu,^a Yaling Wang,^a Weihua Han,*^a Zemin Zhang,^a Heming Zha^b and Erqing Xie

*^a

Author affiliations

* Corresponding authors

^a School of Physical Science and Technology, Lanzhou University, Lanzhou, China
E-mail: hanwh@lzu.edu.cn, xieeq@lzu.edu.cn
Tel: +86 931 8912616

^b Cuiying Honors College, Lanzhou University, Lanzhou, China

Abstract

Rational design and synthesis of core/shell nanostructures as binder-free electrodes has been believed to be an effective strategy to improve the electrochemical performance of supercapacitors. In this work, hierarchical ZnCo₂O₄@Ni_xCo_2x(OH)_6x core/shell nanowire arrays (NWAs) have been successfully constructed by electrodepositing Ni_xCo_2x(OH)_6x nanosheets onto hydrothermally grown ZnCo₂O₄ nanowires and investigated as a battery-type electrode for hybrid supercapacitors. Taking advantage of the hierarchical core/shell structures and the synergetic effect between ZnCo₂O₄ nanowires and Ni_xCo_2x(OH)_6x nanosheets, the optimised core/shell electrode exhibits remarkable electrochemical performance with a high areal capacity (419.1 μA h cm⁻²), good rate capability and cycling stability. Moreover, the assembled ZnCo₂O₄@Ni_xCo_2x(OH)_6x//activated carbon (AC) hybrid device can be reversibly cycled in a large potential range of 0–1.7 V and deliver a maximum energy density of 26.2 W h kg⁻¹ at 511.8 W kg⁻¹. Our findings indicate that the hierarchical ZnCo₂O₄@Ni_xCo_2x(OH)_6x core/shell NWAs have great potential for applications in energy storage devices.

Supplementary files

Article information

DOI: https://doi.org/10.1039/C5TA07965A
Article type: Paper
Submitted: 04 Oct 2015
Accepted: 09 Nov 2015
First published: 11 Nov 2015

Download Citation

J. Mater. Chem. A, 2016,4, 173-182

Author version available

Download author version (PDF)

Permissions

Request permissions

Construction of hierarchical ZnCo₂O₄@Ni_xCo_2x(OH)_6x core/shell nanowire arrays for high-performance supercapacitors

W. Fu, Y. Wang, W. Han, Z. Zhang, H. Zha and E. Xie, J. Mater. Chem. A, 2016, 4, 173 DOI: 10.1039/C5TA07965A

To request permission to reproduce material from this article, please go to the Copyright Clearance Center request page.

If you are an author contributing to an RSC publication, you do not need to request permission provided correct acknowledgement is given.

If you are the author of this article, you do not need to request permission to reproduce figures and diagrams provided correct acknowledgement is given. If you want to reproduce the whole article in a third-party publication (excluding your thesis/dissertation for which permission is not required) please go to the Copyright Clearance Center request page.

Journal of Materials Chemistry A