Electrochemical oxidation to construct a nickel sulfide/oxide heterostructure with improvement of capacitance
Journal of Materials Chemistry A
Royal Society of Chemistry
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.
Liu, Xuan; You, Bo; Yu, Xin-Yao; Chipman, Jeffrey; and Sun, Yujie, "Electrochemical oxidation to construct a nickel sulfide/oxide heterostructure with improvement of capacitance" (2016). Chemistry and Biochemistry Faculty Publications. Paper 682.