Issue 18, 2014

NiCo2O4 nanosheet supported hierarchical core–shell arrays for high-performance supercapacitors

Abstract

Two types of homogeneous NiCo2O4 nanosheet@NiCo2O4 nanorod and heterogeneous NiCo2O4 nanosheet@NiO nanoflake hierarchical core–shell arrays are synthesized via facile solution methods in combination with a simple thermal treatment. In both cases, the NiCo2O4 nanosheets serve as the core backbone for anchoring the shell materials. The two as-prepared hierarchical nanoarrays are evaluated as supercapacitor electrodes and demonstrate excellent electrochemical performance with high specific capacitance (1925 and 2210 F g−1 for NiCo2O4@NiCo2O4 and NiCo2O4@NiO at 0.5 A g−1, respectively), good rate capability, and superior cycling stability. The superior capacitive performance is mainly due to the unique hierarchical core–shell architecture with faster ion/electron transfer, improved reactivity, and enhanced structural stability. Our work can allow for the fabrication of various NiCo2O4 nanosheet supported hierarchical nanostructures for applications in energy storage, catalysis, and sensing.

Graphical abstract: NiCo2O4 nanosheet supported hierarchical core–shell arrays for high-performance supercapacitors

Supplementary files

Article information

Article type
Communication
Submitted
30 Dec 2013
Accepted
29 Jan 2014
First published
31 Jan 2014

J. Mater. Chem. A, 2014,2, 6310-6315

NiCo2O4 nanosheet supported hierarchical core–shell arrays for high-performance supercapacitors

W. Zhou, D. Kong, X. Jia, C. Ding, C. Cheng and G. Wen, J. Mater. Chem. A, 2014, 2, 6310 DOI: 10.1039/C3TA15430K

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