Differential capacitance and electrochemical impedance study of surfactant adsorption on polycrystalline Ni electrode

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• 作者：A. G. Anastopoulos ; A. D. Papoutsis…
• 关键词：Nickel electrode ; Organophosphorus ; Inhibitors ; Capacitive charging ; Irreversible adsorption ; Non ; capacitive response
• 刊名：Journal of Solid State Electrochemistry
• 出版年：2015
• 出版时间：August 2015
• 年：2015
• 卷：19
• 期：8
• 页码：2369-2377
• 全文大小：353 KB
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• 作者单位：A. G. Anastopoulos (1)
  A. D. Papoutsis (1)
  A. A. Papaderakis (1)
  
  1. Department of Chemistry, Aristotle University of Thessaloniki, 54124, Thessaloniki, Greece
  
• 刊物类别：Chemistry and Materials Science
• 刊物主题：Chemistry
  Physical Chemistry
  Analytical Chemistry
  Industrial Chemistry and Chemical Engineering
  Characterization and Evaluation Materials
  Condensed Matter
  Electronic and Computer Engineering
  
• 出版者：Springer Berlin / Heidelberg
• ISSN：1433-0768

文摘

The adsorption of neutral organophosphorous compounds on a charged polycrystalline Ni electrode is studied by differential capacitance and impedance measurements in methanol solutions. Analysis of capacitance measurements reveals that tributylphosphine oxide, tri(n)octylphosphine oxide, and triphenylphosphine follow Langmuir adsorption isotherm. Saturation capacitance C sat, potential of maximum adsorption E max, limiting surface concentration Γ max, and standard Gibbs energy of adsorption ΔG max o at E max are determined. The cathodic reduction of (NiOCH3)ads film formed on Ni surface at positive potentials, introducing a faradaic contribution in addition to the electrostatic charging of the interface, is supported by linear sweep voltammetric and impedance measurements. High values of electrode coverage and strong depression of faradaic currents are attained, indicating that these adsorbates may be suitable as corrosion inhibitors.