Electrochemical Performances Investigation of New Carbon-Coated Nickel Sulfides as Electrode Material for Supercapacitors

Materials

Xinyu Lei¹  Mu Li¹  Min Lu¹  Xiaohui Guan¹ 

[1] School of Chemical Engineering, Northeast Electric Power University, Jilin 132000, China;

关键词: nickel sulfides;    carbon nanotubes;    carbon-coated;    supercapacitors;    electrode material;   

DOI  :  10.3390/ma12213509

来源: DOAJ

【 摘 要 】

A new carbon-coated nickel sulfides electrode material (NST/CNTs@C) has been synthesized through an easy-to-operate process: NiS₂/CNTs which was prepared by a hydrothermal method reacted with BTC (1,3,5-benzenetricarboxylic acid) under the condition of water bath heating to obtain the precursor, and then the precursor was calcined in 450 °C under a nitrogen atmosphere to obtain NST/CNTs@C. The electrochemical performance of NST/CNTs@C has been greatly improved because the formation of a carbon-coated layer effectively increased the specific surface area, reduced the charge transport resistance and inhibited the morphological change of nickel sulfides in the charge−discharge process. Compared with pure NiS₂ and NiS₂/CNTs, NST/CNTs@C presented great specific capacitance (620 F·g⁻¹ at a current density of 1 A·g⁻¹), better cycle stability (49.19% capacitance retention after 1000 cycles) and more superior rate capability (when the current density was raised to 10 A·g⁻¹ the specific capacitance remained 275 F·g⁻¹).

【 授权许可】

Unknown