Electrochemical Behavior of Copper in Aqueous Solutions Under Industrial-Frequency Alternating Current Polarization
- 1Center of Physical-Chemical Methods of Research and Analysis, Farabi University, Almaty 050040, Kazakhstan
Abstract
The electrochemical behavior of copper under industrial-frequency (50 Hz) alternating current polarization was investigated in sulfate- and chloride-containing aqueous solutions using Cu-Cu and Cu-Ti electrode pairs. Copper–copper pairs showed practically no directional electrochemical processes, whereas replacing one electrode with titanium caused copper oxidation owing to a passive TiO2 film that forms on the titanium surface during the anodic half-cycle and acts as a rectifier. By varying the electrolyte composition (H2SO4, Na2SO4, HCl, NaCl), current density (from 2 × 104 to 1.5 × 105 A·m−2) and Cu2+ concentration (5–30 g·L−1), different copper compounds could be synthesized selectively and with high current efficiency: copper(II) oxide (CuO) formed in Na2SO4 (current efficiency up to 89.2%), metallic copper powder formed in H2SO4 containing Cu2+ (up to 75.2%), copper(I) oxide (Cu2O) formed in NaCl (99.1%), and copper(I) chloride (CuCl) formed in HCl with an apparent current efficiency exceeding 100% owing to concurrent processes.
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BibTeX
@article{bayeshov2026electrochemical,
title = {{Electrochemical Behavior of Copper in Aqueous Solutions Under Industrial-Frequency Alternating Current Polarization}},
author = {Abduali Bayeshov and Azhar Bayeshova and Makpal Turlybekova and Fatima Zhumabay},
journal = {Inorganics},
year = {2026},
month = oct,
doi = {10.3390/inorganics14100261},
url = {https://www.mdpi.com/2304-6740/14/10/261},
note = {CC BY 4.0},
}
RIS
TY - JOUR
TI - Electrochemical Behavior of Copper in Aqueous Solutions Under Industrial-Frequency Alternating Current Polarization
AU - Abduali Bayeshov
AU - Azhar Bayeshova
AU - Makpal Turlybekova
AU - Fatima Zhumabay
PY - 2026
DA - 2026/10/13
JO - Inorganics
DO - 10.3390/inorganics14100261
UR - https://www.mdpi.com/2304-6740/14/10/261
AB - The electrochemical behavior of copper under industrial-frequency (50 Hz) alternating current polarization was investigated in sulfate- and chloride-containing aqueous solutions using Cu-Cu and Cu-Ti electrode pairs. Copper–copper pairs showed practically no directional electrochemical processes, whereas replacing one electrode with titanium caused copper oxidation owing to a passive TiO2 film that forms on the titanium surface during the anodic half-cycle and acts as a rectifier. By varying the electrolyte composition (H2SO4, Na2SO4, HCl, NaCl), current density (from 2 × 104 to 1.5 × 105 A·m−2) and Cu2+ concentration (5–30 g·L−1), different copper compounds could be synthesized selectively and with high current efficiency: copper(II) oxide (CuO) formed in Na2SO4 (current efficiency up to 89.2%), metallic copper powder formed in H2SO4 containing Cu2+ (up to 75.2%), copper(I) oxide (Cu2O) formed in NaCl (99.1%), and copper(I) chloride (CuCl) formed in HCl with an apparent current efficiency exceeding 100% owing to concurrent processes.
SN - 2304-6740
ER -