The Comparative Study of Electrochemical Capacitance Performance between Sulphur-Doped Co3O4 and CoS Anodes

Abstract EN

Anode materials with high capacitance performance are highly desirable for supercapacitors (SCs).

In this work, nanomaterials cobalt sulfide (CoS), sulphur-doped Co3O4 (S-Co3O4), and Co3O4 were fabricated on a carbon cloth substrate by hydrothermal method.

The composition and morphology of the material were characterized by X-ray diffraction (XRD) patterns and Scanning Electron Microscope (SEM).

The electrochemical measurements were performed in a three-electrode system.

The result shows that CoS nanomaterial as anode is of the best electrochemical performance, achieving areal capacitance of 1.98 F/cm2 at 2 mA/cm2 in a 5 M LiCl solution.

Moreover, the CoS anode has long-term cycling stability with more than 85.7% capacitance retention after 10000 cycles, confirming its larger capacitance, good redox activity, and electrochemical stability.