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Issue 30, 2016
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Electrochemical oxidation to construct a nickel sulfide/oxide heterostructure with improvement of capacitance

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Abstract

Supercapacitors have been widely recognized as a promising device for the storage of renewable energy. Herein, a facile electrochemical oxidation strategy is described to construct a nickel sulfide/oxide heterostructure which enhances the specific areal capacitance of Ni3S2 electrodeposited on nickel foam. The resulting heterostructure electrode exhibits high areal capacitance, 65 times that of the as-prepared Ni3S2 electrode (2035 mF cm−2vs. 31 mF cm−2 at a current density of 8 mA cm−2), while still maintaining great stability, showing no performance degradation after 5000 charge–discharge cycles. Its exceptional capacitance, advanced rate capability, and superior cycling stability are attributed to the transformed composition and unique nanostructure achieved during electrochemical oxidation, which can provide a large electrochemically active surface area, fast electron/electrolyte ion transport, and robust structural stability. Such a low-cost and facile strategy can be potentially applicable to prepare many other materials for supercapacitor applications.

Graphical abstract: Electrochemical oxidation to construct a nickel sulfide/oxide heterostructure with improvement of capacitance

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Supplementary files

Article information


Submitted
23 May 2016
Accepted
27 Jun 2016
First published
28 Jun 2016

J. Mater. Chem. A, 2016,4, 11611-11615
Article type
Communication

Electrochemical oxidation to construct a nickel sulfide/oxide heterostructure with improvement of capacitance

X. Liu, B. You, X. Yu, J. Chipman and Y. Sun, J. Mater. Chem. A, 2016, 4, 11611
DOI: 10.1039/C6TA04289A

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