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The Ti/IrO2-Ta2O5 electrode was well performed as a mixed metal oxide for the oxygen evolution reaction. In the industry, the high price of its fabrication caused its utilization to be limited. In the present work, to reduce the cost, low-content IrO2-included electrode was used in producing electrodes so that they did not show lower performance for the catalytic oxygen revolution reaction. Ti/IrO2-Ta2O5-SiO2 electrode was prepared by the solgel method of iridium chloride, tantalum chloride, and tetra ethoxy orthosilicate salts at 430 C. Doping silicon oxide and tantalum oxide to the electrode increases the corrosion resistance in acidic media. The surface morphology of the electrode was evaluated by SEM and EDAX. Furthermore, the stability of the electrode was investigated for use as an anode in the electrowinning system of copper, in 0.5 M sulfuric acid at 30 C and under a constant current of 1.5 Acm-2, as a function of the electrolysis time during the ALT. The results indicated that the prepared electrode had a stability of 173 h in the sulfuric acid solution. Moreover, the electrocatalytic activity of the electrode during the stability test was studied by the cyclic voltammetry. It was found that with the penetration of the electrolyte into the coating, the amount of electrical charge increased to 70.2 mC.cm-2, whereas it decreased to 31.4 mC.cm-2 with the electrode degradation.
 

Keywords: Mixed metal oxide, Oxygen evolution reaction, electrowinning, tantalum oxide

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