ZnCo2O4及ZnCo2O4/rGO复合材料的制备与电化学性能

采用一步水热法制备尖晶石型钴酸锌(ZnCo_2O_4)及钴酸锌/石墨烯(ZnCo_2O_4/rGO)复合材料,通过XRD,SEM和RST5000电化学工作站对材料的组分、表面形貌及电化学性能进行表征。通过改变水热温度,制备出具有辐射状花簇团结构、褶皱片层结构和表面光滑的球体结构的ZnCo_2O_4电极材料。结果表明:加入石墨烯后,ZnCo_2O_4呈规则的多边形结构,附着在石墨烯片上,两者的协同作用可有效改善电极材料的电化学性能;钴酸锌与氧化石墨烯的质量比为6∶1时得到的ZnCo_2O_4/rGO复合材料的比电容为205F/g,比纯ZnCo_2O_4的比电容提升了约114%。

Preparation and electrochemical properties of ZnCo_2O_4 and ZnCo_2O_4/rGO composites

A facile one-pot hydrothermal route was selected for the synthesis of ZnCo2O4 and ZnCo2O4/rGO composite electrode materials.The structure,morphology and electrochemical properties of the as-perpared materials were characterized by XRD,SEM and RST5000 electrochemical workstation.ZnCo2O4 electrode materials with a group of radial structure,folding lamellar structure and the spherical structure were obtained by changing the hydrothermal temperature.Results show that after the addition of graphene,ZnCo2O4 exhibits regular polygonal structure and is attached to graphene sheets.Their synergistic effect can effectively improve the electrochemical performance of electrode materials.When the mass ratio of zinc cobaltate to graphene oxide is 6∶1,the specific capacitance of ZnCo2O4/rGO composite material is 205F/g,which is 114%higher than that of pure ZnCo2O4.