ZnCo₂O₄-ZnO@C@CoS Core-shell Composite: Preparation and Application in Supercapacitors

Supercapacitors, distinguished by their unique advantages, including high power performance, stable cycling behavior, and excellent safety, emerged as highly promising energy storage devices for new energy vehicles and mobile electronic applications.However, the issue of relatively low energy density continues to constrain their practical applications.To enhance electrochemical activity, CoS nanosheets were deposited onto ZnCo2O4-ZnO microspheres coated with carbon materials (ZCO-ZO@C@CoS) using a facile solvothermal method, calcination treatment, and electrodeposition reaction.Carbon layer not only promoted electron transport to enhance electrical conductivity, but also improved the stability of the structure.The open network space formed between CoS nanosheets facilitated rapid ion transport.Additionally, CoS nanosheets possessed abundant electroactive sites, enabling rapid reversible redox reactions.The co-effect of nanowires of the core-shell structure, the carbon layer, and the outer nanosheets effectively enhanced the overall electrochemical performance.Consequently, 第*期 杨恩东, 等: ZnCo2O4-ZnO@C@CoS 核壳复合材料的制备及其在超级电容器中的应用 2 ZCO-ZO@C@CoS exhibited a specific capacitance of 1944 F• g -1 (972 C•g -1 ) at 1.5 A•g -1 , with an initial capacity retention of 75% after 10000 cycles at 20 A•g -1 .The asymmetric supercapacitor device, comprising ZCO-ZO@C@CoS (positive electrode) and activated carbon (negative electrode), also demonstrated excellent specific capacitance, high-rate performance, and exceptional cycling stability, indicating significant potential for practical applications.