Document Type

Article

Journal/Book Title

Journal of Materials Chemistry A

Publication Date

2016

Publisher

Royal Society of Chemistry

Volume

4

Issue

30

First Page

11611

Last Page

11615

DOI

10.1039/c6ta04289a

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 electrode (2035 mF cm-2 vs. 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.

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