Effect of coating MoS₂ nanoflakes onto CuCo₂O₄ on the electrochemical performance as electrode materials of supercapacitors

Abstract

CuCo2O4@MoS2 microflowers have been synthesized on Ni foam using a hydrothermal method, and their electrochemical performances as supercapacitor electrodes are investigated. The influence of MoS2 loading on the specific capacity and cycle stability of the nanocomposites is systematically analyzed. It is found that the addition of MoS2 significantly enhances the specific capacity of the CuCo2O4 microflowers, while the cycle stability varies with MoS2 content. Competitive mechanistic insights into the interplay between MoS2 content, electrochemical behavior, and structural stability during cycling are provided. Notably, the CuCo2O4@MoS2-60 sample exhibits an impressive specific capacity of 11.1 F cm−2 at a discharge current density of 0.003 A cm−2, with a remarkable capacity retention rate of 94.6% after 1800 charge–discharge cycles. Moreover, the practical application prospects are demonstrated through the fabrication of symmetric supercapacitors. This study offers valuable guidance for the rational design and optimization of CuCo2O4@MoS2 nanocomposites for high-performance supercapacitor applications.