钴酸镍纳米花/活性炭纤维复合物的制备和表征及其超级电容器性能

摘要

利用简单的水热法以及后续热处理,将钴酸镍纳米花成功生长在活性炭纤维支架上.场发射扫描电镜(FESEM)及透射电镜(TEM)结果表明,纳米花是由纳米针自组装而成,而纳米针呈多孔结构.这种三维复合多级结构非常有利于电解质离子的渗透和电子的传输.将该多孔钴酸镍纳米花/活性炭纤维布作为工作电极,表现出优良的电容性能.在1A·g-1时,比电容高达1626 F·g-1;在10A·g-1时,电容保持率为65％,具有超高的电容值和优异的倍率特性.%In the present work,NiCo2O4 nanowires grown directly on carbon fibers self-organize into a nanoflower morphology.The materials are prepared by hydrothermal treatment and subsequent low-temperature annealing.Field emission scanning electron microscopy (FESEM) and transmission electron microscopy (TEM) results reveal a hierarchical three-dimensional mesoporous structure,which facilitates ion transport and electronic conduction for fast redox reactions.As a result,the electrode achieves a respectable specific capacitance of 1626 F· g-1 at 1 A· g-1 and high rate capability (65％ retention at 10 A· g-1),so it shows promise for application in supercapacitors.