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Electrochemical impedance spectroscopic studies of copper dissolution in glycine-hydrogen peroxide solutions
Published in
2010
Volume: 14
   
Issue: 11
Pages: 2057 - 2064
Abstract
Anodic dissolution of copper in glycine solution at various hydrogen peroxide concentrations was investigated. The dissolution rate increases, reaches a maximum, and then decreases with hydrogen peroxide concentration. Anodic polarization studies and electrochemical impedance spectroscopy (EIS) studies were carried out to determine the mechanistic pathway of anodic dissolution of copper in glycine system at three different hydrogen peroxide concentrations: one at low hydrogen peroxide concentration in the active dissolution region, another in the maximum dissolution region, and the third at the high hydrogen peroxide concentration in the post-peak-dissolution region. The EIS data in complex plane plots show presence of two capacitance loops and one negative capacitance loop. The impedance plot patterns strongly depend on the hydrogen peroxide concentration in solution. Reaction mechanism analysis technique was employed to model the EIS data. A three-step mechanism with two intermediate adsorbates and a parallel dissolution by catalytic mechanism simulates EIS patterns which match the experimental trends. The intermediates are likely to be cupric and cuprous oxides. The essential features of impedance spectra at various overpotentials at three different hydrogen peroxide concentrations are captured by the proposed mechanism. The results also show that the film present on the copper surface in glycine and hydrogen peroxide solutions does not passivate the surface. © 2010 Springer-Verlag.
About the journal
JournalJournal of Solid State Electrochemistry
ISSN14328488
Open AccessNo
Concepts (37)
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    ACTIVE DISSOLUTION
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    Anodic dissolution
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    Catalytic mechanisms
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    COMPLEX PLANE PLOT
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    COPPER DISSOLUTION
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    Copper surface
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    Cuprous oxide
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    Dissolution rates
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    Electrochemical impedance
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    Glycine
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    GLYCINE SOLUTIONS
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    HYDROGEN PEROXIDE CONCENTRATION
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    Impedance spectrum
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    Mechanistic pathways
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    NEGATIVE CAPACITANCE
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    OVER POTENTIAL
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    Polarization study
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    POST-PEAK
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    REACTION MECHANISM ANALYSIS
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    Spectroscopic studies
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    THREE-STEP MECHANISM
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    Capacitance
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    CHEMICAL MECHANICAL POLISHING
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    CHEMICAL POLISHING
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    Concentration (process)
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    Copper
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    Electrochemical corrosion
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    Electrochemical impedance spectroscopy
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    Hydrogen
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    Hydrogen peroxide
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    Mechanisms
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    Metal analysis
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    Oxidation
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    Polishing
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    Spectroscopic analysis
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    Spectrum analysis
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    Dissolution