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      Supercapacitive performance of single phase CuO nanosheet arrays with ultra-long cycling stability

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      Author
      Shu, Xia
      Wang, Yan
      Cui, Jiewu
      Xu, Guanqing
      Zhang, Jianfang
      Yang, Wanfen
      Xiao, Mingfeng
      Zheng, Hongmei
      Qin, Yongqiang
      Zhang, Yong
      Chen, Zhong
      Wu, Yucheng
      Date of Issue
      2018
      School
      School of Materials Science and Engineering
      Abstract
      Copper oxide nanofilms can be fabricated on Cu foam by a simple electrochemical anodization process. However, it is difficult to obtain single-phase nanofilms that consist only of Cu2O or CuO. In this work, we present a modified anodization process that includes (NH4)6Mo7O24·4H2O in the electrolyte solution, and prepare single-phase CuO nanofilms grown directly on Cu foam. The surface morphologies of the CuO nanofilms are greatly dependent on the concentration of (NH4)6Mo7O24·4H2O included in the electrolyte solution during the anodization process, and accordingly present nanodots, nanoflakes, nanosheets, and/or nanobelts. The synthesis mechanism for CuO nanofilms is discussed in detail. The as-fabricated single-phase CuO nanofilms can be directly employed as electrodes that exhibit good supercapacitive performance, with an areal capacitance greater than 600 mF cm-2 at a current density of 1 mA cm−2 in a 2 M KOH aqueous solution. Moreover, the single-phase CuO nanofilm electrodes also demonstrate excellent long term cycling stability with about 94% retention of the initial areal capacitance after 10,000 charge/discharge cycles. The results demonstrate that the CuO nanofilms prepared on Cu foam by our modified anodization process are promising electrode materials for high-performance flexible supercapacitors.
      Subject
      CuO Nanofilm
      Ammonium Molybdate
      Engineering::Materials
      Type
      Journal Article
      Series/Journal Title
      Journal of Alloys and Compounds
      Rights
      © 2018 Elsevier B.V. All rights reserved.
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      • MSE Journal Articles
      http://dx.doi.org/10.1016/j.jallcom.2018.03.267
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