Synthesis and Characterization of NiCo2O4 Nanoflower/Activated Carbon Fiber Composite and Its Supercapacitor Properties

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.