Preparation and supercapacitance of CuO nanosheet arrays grown on nickel foam

• Published in: Journal of power sources Vol. 196; no. 13; pp. 5756 - 5760
• Main Authors: Wang, Guiling, Huang, Jichun, Chen, Shuli, Gao, Yinyi, Cao, Dianxue
• Format: Journal Article
• Language: English
• Published: Amsterdam Elsevier B.V 01.07.2011; Elsevier
• Subjects: Applied sciences; Arrays; Capacitance; Capacitors. Resistors. Filters; COMPOSITES; COPPER OXIDE; CURRENT DENSITY; Electrical engineering. Electrical power engineering; Exact sciences and technology; Foams; MICROSTRUCTURES; Nanocomposites; Nanomaterials; Nanosheet array; Nanostructure; Nickel; Nickel foam; Scanning electron microscopy; Supercapacitor; Various equipment and components; Supercapacitor; Capacitance; Copper oxide; Nickel foam; Nanosheet array; Nanosheet; Foam; Nickel; Electrolytic capacitor
• ISSN: 0378-7753; 1873-2755
• DOI: 10.1016/j.jpowsour.2011.02.049

► CuO nanosheet arrays on nickel foam are prepared via a facile one-step method. ► Nanosheet array CuO exhibits a high specific capacitance of 569 F g −1 in KOH solution. ► CuO nanosheet arrays electrode has porous structure and high utilization of CuO. CuO nanosheet arrays freely standing on nickel foam are prepared via a template-free growth method. The morphology of CuO nanosheet arrays is examined by scanning and transmission electron microscopy and the phase structure of nanosheets is analyzed by X-ray diffraction spectroscopy. The supercapacitance of CuO nanosheet arrays is investigated by cyclic voltammetry, galvanostatic charge/discharge test and electrochemical impedance spectroscopy. The results show that the array of CuO nanosheets forms a uniform film of around 5 μm in thickness on nickel foam skeleton. The film is composed of clusters of arrays of nanosheets with a thickness up to around 150 nm. The CuO nanosheet arrays exhibit a specific capacitance of 569 F g −1 at a current density of 5 mA cm −2 in 6.0 mol dm −3 KOH electrolyte. The capacitance loss is less than 17.5% after 500 charge/discharge cycles at 10 mA cm −2 and with columbic efficiency higher than 93%.