On the Dissolution of a Copper Electrode with the Production of Copper (II) Oxide During Alternating Current Polarization in a Sulfate Electrolyte
Bayeshova А. Bayeshov А. Zhumabay F.
2024Sociedade Portuguesa de Electroquimica
Portugaliae Electrochimica Acta
2024#42Issue 4273 - 283 pp.
The present study demonstrated that, when a Cu-Ti electrode pair was polarized in an aqueous SO2-4 electrolyte, Cu was oxidized to a divalent state, under AC. In the solution volume, Cu2+ interacted with OH¯, to produce Cu(OH)2. Depending on the electrolysis conditions, Cu(OH)2 underwent a dehydration reaction, which produced CuO. Under industrial AC, each electrode was alternately polarized, firstly towards the anode, then to the cathode. CuE passivation did not occur. With a change in j on TiE, in the range from 0 to 75 kA/m2, CuE dissolution CE increased, reaching 96.5%. When j on CuE was increased to 1000 A/m2, Cu dissolution CE was above 90%. The most favourable conditions for CuE dissolution were a Na2SO4 Ct from 65 to 75 g/L, experiment duration of 1 h, room T, and I frequency of 50 Hz. The obtained CuO (II) composition was identified by XRD and EDXRF analyses.
AC , Cu , CV , dissolution , electrolysis , Ti
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Center of Physicochemical Methods of Research and Analysis, Al-Farabi Kazakh National University, Almaty, 050000, Kazakhstan
JSC D. V. Sokolsky Institute of Fuel, Catalysis and Electrochemistry, Almaty, 050000, Kazakhstan
Center of Physicochemical Methods of Research and Analysis, Al-Farabi Kazakh National University, Kazakhstan
Center of Physicochemical Methods of Research and Analysis
JSC D. V. Sokolsky Institute of Fuel
Center of Physicochemical Methods of Research and Analysis
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