Temperature dependence of Ni3S2 nanostructures with high electrochemical performance

• Published in: Applied surface science Vol. 436; pp. 42 - 49
• Main Authors: Wang, Y.L., Wei, X.Q., Li, M.B., Hou, P.Y., Xu, X.J.
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 01.04.2018
• Subjects: Electrochemical performance; Ni3S2; Solvothermal method; Ni3S2; Electrochemical performance; Solvothermal method
• ISSN: 0169-4332; 1873-5584
• DOI: 10.1016/j.apsusc.2017.11.270

•The different pure Ni3S2 structures have been successfully fabricated on Ni foam through a simple and green one-step solvothermal method.•The morphologies properties of Ni3S2 with 3D nanosheets array and silkworm eggs-like shape were dependent on reaction temperature.•Ni3S2-180 °C 3D nanosheets array is a promising electrode material with high electrochemical performance for pseudocapacitors. Different Ni3S2 nanostructures have been successfully synthesized at different temperatures by a facile and efficient solvothermal method. The Ni3S2 nanostructures with three-dimensional (3D) nanosheets array and silkworm eggs-like morphologies were obtained by adjusting the reaction temperature. A large number of 3D nanosheets are interconnected to form an open network structure with porous of Ni3S2 at 180 °C, and electrochemical tests showed that the special structure exhibited the outstanding specific capacitance (1357 F g −1 at 1 A g−1) and excellent cycling stability (maintained 91% after 3000 cycles). In comparison, the performance of Ni3S2 silkworm eggs-like structure is not very perfect. This may be due to the fact that the 3D nanosheets with porous structure can improve the electrochemical performance by shortening effectively the diffusion path of electrolyte ions and increasing the active sites during charging and discharging. Among them, the reaction temperature is the main factor to control the formation of the 3D nanosheets array. These results indicated the Ni3S2 nanosheets promising applications as high-performance supercapacitor electrode materials.