一步法合成ZnO/Co_3O_4复合电极材料及电化学性能研究

One Step Fabrication of ZnO/Co_3O_4 Composites with superior performance

以硝酸钴和硝酸锌为金属源,采用水热法在导电基底Ni网上原位生长海胆状ZnO/Co_3O_4复合电极材料,讨论了复合电极结构、形貌与电性能之间的关系.采用X射线衍射(XRD)、扫描电镜(SEM)、对其结构和形貌进行了表征,在三电极体系中进行了电化学性能测试.结果表明,复合后电极材料在电流密度为0.5 A·g(-1),电极的比容量达307 F·g^((-1)),当电流密度增加到8 A·g(-1)时,比电容的保持率为60%,相比于单一金属氧化物Co_3O_4(0.5 A·g(-1)时,电极比容量269 F·g(-1)和25%的电容保持率)表现出较高的倍率特性较好的电荷传导能力.

Urchin-like ZnO/Co3O4 on Ni foam has been fabricated by a facile hydrothermal approach. The structure,morphology and electrochemical properties of the composite were investigated. The microstructure and morphologies of the resulting materials were characterized by XRD,SEM,TEM,and electrochemical measurements. The results indicate that the charge-discharge measurements made at a discharge current of 0. 5A·g^-1 showed higher specific capacitance of 307 F·g^-1（ with the capacity retention of 60% at 8 A·g^-1）.Compared with the single Co3O4（ at a discharge current of 0. 5 A·g^-1 showed higher specific capacitance of269 F·g^-1,the capacity retention of 225% at 8 A·g^-1）,the electrode show excellent electron conductivity property and rate capability.