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Kinetics of the Cu2O Chemical Decomposition during the Copper Electrochemical Oxidation in the Sulfu |
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18.09.2008 г. |
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Kinetics of the Cu2O Chemical Decomposition during the Copper Electrochemical Oxidation in the Sulfuric-Acid-Based Electrolyte Systems A. V. Noskov, E. P. Grishina, and A. M. Pimenova Institute of Solutions Chemistry, Russian Academy of Sciences,
ul. Akademicheskaya 1, Ivanovo, 153045 Russia e-mail:
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Received May 23, 2005 Abstract — Electrochemical copper oxidation in sulfuric acid aqueous solutions and sulfate electrolytes thickened with the silicon-dioxide powder is studied potentiodynamically. Based on the current theoretical concepts, the polarization-rate dependences of the anodic current density maximum is analyzed. It is shown that these dependences can be adequately described using a porous-layer resistance model that takes into account chemical decomposition of the passivating Cu2O film formed via electrochemical mechanism. The film decomposi-tion rate constants are calculated for the studied electrolytic systems at different temperatures.
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