Intense pulsed light-assisted facile and agile fabrication of cobalt oxide/nickel cobaltite nanoflakes on nickel-foam for high performance supercapacitor applications

• Published in: Journal of alloys and compounds 2015-01, Vol.618, p.227-232
• Main Authors: Jang, Kihun, Yu, Seongil, Park, Sung-Hyeon, Kim, Hak-Sung, Ahn, Heejoon
• Format: Article
• Language: English
• Subjects: Intense pulsed light; Metal oxide; Nanoflake; Supercapacitors
• ISSN: 0925-8388; 1873-4669
• DOI: 10.1016/j.jallcom.2014.08.166

•The CoO/NiCo2O4 nanoflakes are formed on Ni-foam substrate by IPL irradiation.•The nanoflakes are formed by IPL irradiation with an energy of 20Jcm−2 for 15ms.•The CoO/NiCo2O4 nanoflakes exhibit a very high specific capacitance of 2163Fg−1.•They show a good rate performance of 908Fg−1 even at 50Ag−1. 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 morphological characterization is carried out using X-ray diffraction (XRD) and scanning and transmission electron microscopies (SEM and TEM). These reveal that hierarchically structured CoO/NiCo2O4 nanoflakes of 150–200nm in size and a thickness around 10nm are formed on Ni-foam substrate by IPL irradiation with energy of 20Jcm−2 for 15ms. 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 1Ag−1 and a good rate performance of 908Fg−1 even at 50Ag−1.