Issue 25, 2015

Fabrication of urchin-like NiCo2(CO3)1.5(OH)3@NiCo2S4 on Ni foam by an ion-exchange route and application to asymmetrical supercapacitors

Abstract

Pseudocapacitor electrode materials, such as transition metal oxides/sulfides, have been extensively investigated and shown to have fast energy storage properties, but their low rate performance and poor cycle stability are serious problems in practical applications. We present here a design for the architecture of these electrode materials with the aim of improving the rate performance and cycle stability of pseudocapacitors by using an interface ion-exchange method. Precursor materials obtained by a hydrothermal reaction were soaked in aqueous NaHS solution to synthesize the urchin-like core–shell structure of NiCo2(CO3)1.5(OH)3@NiCo2S4. Such core–shell nanostructure electrode materials can make full use of both components with synergistic effects. Excellent results were obtained with a capacitance of 956.4 F g−1 at a current density of 4 A g−1 in the three-electrode system and an actual energy density of 32.3 W h kg−1 and power density of 1835 W kg−1 in the asymmetrical supercapacitor.

Graphical abstract: Fabrication of urchin-like NiCo2(CO3)1.5(OH)3@NiCo2S4 on Ni foam by an ion-exchange route and application to asymmetrical supercapacitors

Supplementary files

Article information

Article type
Paper
Submitted
14 Apr 2015
Accepted
08 May 2015
First published
12 May 2015

J. Mater. Chem. A, 2015,3, 13308-13316

Author version available

Fabrication of urchin-like NiCo2(CO3)1.5(OH)3@NiCo2S4 on Ni foam by an ion-exchange route and application to asymmetrical supercapacitors

B. Yang, L. Yu, H. Yan, Y. Sun, Q. Liu, J. Liu, D. Song, S. Hu, Y. Yuan, L. Liu and J. Wang, J. Mater. Chem. A, 2015, 3, 13308 DOI: 10.1039/C5TA02684A

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