Corresponding Author

Yuan-you Wang(wangyy@ypi.edu.cn)


In this work, the NiS2 nanosheets have been synthesized using Ni(OH)2 as a precursor through a sacrificial template method. The microstructure and chemical composition of as-prepared NiS2 were characterized by XRD, EDS, BET, SEM and TEM techniques. The results showed that both Ni(OH)2 and NiS2 were composed of nanoplates. The electrochemical tests revealed that NiS2 exhibited the high specific capacitance of 1067.3 F•g-1 at a current density of 1 A•g-1 and excellent rate performance. Furthermore, in order to evaluate the practical application of NiS2, an asymmetric supercapacitor, NiS2 as the positive electrode and AC as the negative electrode, displayed high energy density of 38.4 Wh•kg-1 with a power density of 0.8 kW•kg-1. Meanwhile, the asymmetric supercapacitor showed a superior cycling performance and 93.7% of the specific capacitance was retained after 3000 charge-discharge cycles.

Graphical Abstract


sacrificial template method, NiS2, Asymmetric supercapacitor

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