Post annealing temperature-dependent morphological and electrochemical properties of copper hydroxide thin film electrodes obtained by anodization of copper

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• 作者：T. S. Ghadge ; B. J. Lokhande
• 刊名：Journal of Materials Science
• 出版年：2016
• 出版时间：November 2016
• 年：2016
• 卷：51
• 期：21
• 页码：9879-9888
• 全文大小：3,321 KB
• 刊物类别：Chemistry and Materials Science
• 刊物主题：Chemistry
  Materials Science
  Characterization and Evaluation Materials
  Polymer Sciences
  Continuum Mechanics and Mechanics of Materials
  Crystallography
  Mechanics
  
• 出版者：Springer Netherlands
• ISSN：1573-4803
• 卷排序：51

文摘

Anodization of copper substrates was made in 1 M aqueous sodium hydroxide solution to prepare copper hydroxide thin films. The prepared samples (at 0.9 V) were annealed in air for 1 h by varying the annealing temperature from 523 to 673 K. XRD study confirms the orthorhombic crystal structure for copper hydroxide, whereas cubic to monoclinic crystal structure transformation was observed for copper oxide with increasing annealing temperature. The increase in granular size of copper oxide with temperature was clearly endorsed from morphological study. Electrochemical study reveals the pseudocapacitive behavior for the sample annealed at 598 K with optimum-specific capacitance of 6000 F/g at the scan rate 2 mV/s in 1 M NaOH. The Specific energy, Specific power, and Columbic efficiency (η) were calculated by using chronopotentiometric technique. Electrochemical impedance spectroscopy carried out in the frequency range of 1 mHz–1 MHz gives internal resistance which is about 1.75 Ω/cm2. The Randles equivalent circuit and its circuitry parameters are reported.