Issue 20, 2016

Three-dimensional hierarchical NiCo2O4 nanowire@Ni3S2 nanosheet core/shell arrays for flexible asymmetric supercapacitors

Abstract

Three-dimensional (3D) hierarchical NiCo2O4@Ni3S2 core/shell arrays on Ni foam were synthesized by a facile, stepwise synthesis approach. The 3D heterogeneous NiCo2O4 nanostructure forms an interconnected web-like scaffold and serves as the core for the Ni3S2 shell. The as-prepared NiCo2O4@Ni3S2 nanowire array (NWA) electrodes exhibited excellent electrochemical performance, such as high specific areal capacitance and excellent cycling stability. The specific areal capacitance of 3.0 F cm−2 at a current density of 5 mA cm−2 is among the highest values and the only 6.7% capacitance decay after 10 000 cycles demonstrates the excellent cycling stability. A flexible asymmetric supercapacitor (ASC) was fabricated with activated carbon (AC) as the anode and the obtained NiCo2O4@Ni3S2 NWAs as the cathode. The ASC device exhibited a high energy density of 1.89 mW h cm−3 at 5.81 W cm−3 and a high power density of 56.33 W cm−3 at 0.94 mW h cm−3. As a result, the hybrid nanoarchitecture opens a new way to design high performance electrodes for electrochemical energy storage applications.

Graphical abstract: Three-dimensional hierarchical NiCo2O4 nanowire@Ni3S2 nanosheet core/shell arrays for flexible asymmetric supercapacitors

Supplementary files

Article information

Article type
Paper
Submitted
29 Mar 2016
Accepted
22 Apr 2016
First published
25 Apr 2016

Nanoscale, 2016,8, 10686-10694

Three-dimensional hierarchical NiCo2O4 nanowire@Ni3S2 nanosheet core/shell arrays for flexible asymmetric supercapacitors

B. Liu, D. Kong, Z. X. Huang, R. Mo, Y. Wang, Z. Han, C. Cheng and H. Y. Yang, Nanoscale, 2016, 8, 10686 DOI: 10.1039/C6NR02600A

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