【摘要】 采用水热合成法,以CoCl2·6 H2O为原料、尿素为沉淀剂,制备Co3O4/GONS复合体作为超级电容器的电极材料。对样品的物相结构、微观形貌和电容性能进行表征和测试。结果表明:纯Co3O4材料呈纳米纤维状;复合一定量的GO后,Co3O4呈现片状孔隙结构,由很多10~20 nm的微小颗粒相互连接构成,并且Co3O4薄片紧凑成束状分布在GO表面上。由于静电吸引及配位作用形成的GO对Co2+离子的限域效应,确保了钴氧化物在纳米GO片上的二维可控生长。Co3O4/GONS电极材料具有较好的电容性能,在0.5 A/g的电流密度下比电容能达到444 F/g,比纯Co3O4的比电容(298 F/g)提高了49%;当电流密度增加至5 A/g时,比电容还能保持在262 F/g。更多还原

【Abstract】 The Co3O4/GONS(graphene oxide nanosheets) composite was prepared with CoCl2·6 H2 O as raw material and urea as a precipitating agent via a facile hydrothermal route. The morphology, microstructure and capacitive performance of the composite were characterized. It was revealed that the prepared pure Co3O4 was fibrous. As for Co3O4/GONS composite, Co3O4 which was composed by many fine interconnected nanoparticles(10-20 nm) showed the nanosheet morphology, and the Co3O4 nanosheets aggregate into a beam shape on the surface of GO. The formation of Co3O4 nanosheets could be interpreted that the confinement of Co2+ on GONS due to electrostatic and coordination interaction could ensure controlled crystal growth of 2-dimensional cobalt oxides on the surface of GO.The Co3O4/GONS electrode materials exhibit excellent capacitive performance. The specific capacitance reaches 444F/g at a current density of 0.5 A/g, which increases by 49% in comparison with pure Co3O4 electrode, and still remains262 F/g at 5 A/g.更多还原