Intense Pulsed Light-assisted Facile and Agile Fabrication of Cobalt Oxide/Nickel Cobaltite Nanoflakes on Nickel-Foam for High Performance Supercapacitor

Abstract

We report an extremely efficient method for fabricating high-performance supercapacitive CoO/NiCo2O4 nanoflakes on Ni-foam substrate by using intense pulsed light (IPL) technology. Structural and morpho- logical characterization is carried out using X-ray diffraction (XRD) and scanning and transmission elec- tron microscopies (SEM and TEM). These reveal that hierarchically structured CoO/NiCo2O4 nanoflakes of 150–200 nm in size and a thickness around 10 nm are formed on Ni-foam substrate by IPL irradiation with energy of 20 J cm􏰀2 for 15 ms. The electrochemical behavior of the composites is analyzed by cyclic voltammetry and galvanostatic charge–discharge experiments. The IPL-induced CoO/NiCo2O4/Ni-foam electrode exhibits a very high specific capacitance of 2163Fg􏰀1 at a discharge current density of 1 Ag􏰀1 and a good rate performance of 908 Fg􏰀1 even at 50 Ag􏰀1.