Preparation and supercapacitance of CuO nanosheet arrays grown on nickel foam

Abstract 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%.

[1]  Xiaofen Li,et al.  Progress of electrochemical capacitor electrode materials: A review , 2009 .

[2]  Milin Zhang,et al.  Synthesis of CuO nanocrystalline and their application as electrode materials for capacitors , 2008 .

[3]  R. Kötz,et al.  Principles and applications of electrochemical capacitors , 2000 .

[4]  D. Dhawale,et al.  Fabrication of copper oxide multilayer nanosheets for supercapacitor application , 2010 .

[5]  Yu Zhou,et al.  Simple synthesis of surface-modified hierarchical copper oxide spheres with needle-like morphology as anode for lithium ion batteries , 2010 .

[6]  Shuru Chen,et al.  One-step fabrication of CuO nanoribbons array electrode and its excellent lithium storage performance , 2009 .

[7]  A. Burke.  Ultracapacitors: why, how, and where is the technology , 2000 .

[8]  Sylvie Grugeon,et al.  Particle Size Effects on the Electrochemical Performance of Copper Oxides toward Lithium , 2001 .

[9]  Huaiyong Zhu,et al.  Preparation and Electrochemical Performance of Polycrystalline and Single Crystalline CuO Nanorods as Anode Materials for Li Ion Battery , 2004 .

[10]  E. Cairns,et al.  Application of probe beam deflection to study the electrooxidation of copper in alkaline media , 1995 .

[11]  Yu Zhou,et al.  Self-assembled synthesis of hierarchical nanostructured CuO with various morphologies and their application as anodes for lithium ion batteries , 2010 .

[12]  Mathieu Toupin,et al.  Charge Storage Mechanism of MnO2 Electrode Used in Aqueous Electrochemical Capacitor , 2004 .

[13]  Taihong Wang,et al.  Electrochemical performance of polycrystalline CuO nanowires as anode material for Li ion batteries , 2009 .

[14]  B. G. Ateya,et al.  Cyclic voltammetry of copper in sodium hydroxide solutions , 1981 .

[15]  G. Yin,et al.  Flower-like CuO film-electrode for lithium ion batteries and the effect of surface morphology on electrochemical performance , 2007 .

[16]  C. Lokhande,et al.  Electrodeposited porous and amorphous copper oxide film for application in supercapacitor , 2009 .

[17]  L. Burke,et al.  An Investigation of the Anodic Behavior of Copper and Its Anodically Produced Oxides in Aqueous Solutions of High pH , 1990 .

[18]  S. Kuwabata,et al.  Voltammetric Characterization of Oxide Films Formed on Copper in Air , 2001 .

[19]  Š. Komorsky-Lovrič,et al.  Voltammetry of copper oxide micro-particles immobilised on diatomite surface , 2008 .

[20]  Milin Zhang,et al.  Preparation of flower-like CuO by a simple chemical precipitation method and their application as electrode materials for capacitor , 2008 .

[21]  Y. Gogotsi,et al.  Materials for electrochemical capacitors. , 2008, Nature materials.

[22]  J. Tu,et al.  Incorporation of MWCNTs into leaf-like CuO nanoplates for superior reversible Li-ion storage , 2010 .

[23]  Jian-Bo He,et al.  Potential dependence of cuprous/cupric duplex film growth on copper electrode in alkaline media , 2006 .

[24]  A. Gewirth,et al.  Voltammetric and force spectroscopic examination of oxide formation on Cu(111) in basic solution , 2002 .

[25]  A. Burke.  R&D considerations for the performance and application of electrochemical capacitors , 2007 .

[26]  F. Huang,et al.  An entirely electrochemical preparation of a nano-structured cobalt oxide electrode with superior redox activity , 2009, Nanotechnology.