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- Title
Parametric study on the electrochemical performance and stability of PbO<sub>2</sub>-coated titanium electrodes for electrowinning applications.
- Authors
Sharifidarabad, Hadi; Zakeri, Alireza; Adeli, Mandana
- Abstract
In recent years, lead dioxide coatings have received extensive attention as promising anode material for electrochemical processes. In the present study, the electrodeposition of PbO2 on a Ti substrate from nitrate bath was investigated to serve as the oxygen evolution anode for electrowinning of nonferrous metals. The effect of predeposition of the α-PbO2 interlayer between the Ti substrate and the β-PbO2 top layer, as well as the use of additives such as copper ions and sodium dodecyl sulfate in the electrolyte was studied. The coatings were characterized using regular and grazing-incidence X-ray diffractometry, and scanning electron microscopy (SEM) techniques. The electrochemical properties of the prepared PbO2-coated Ti electrodes were evaluated and electrocatalytic activity was quantified using imax from cyclic voltammetry, in combination with linear sweep voltammetry, electrochemical impedance spectroscopy, and accelerated life test. It was found out that the Ti/α-PbO2/β-PbO2 electrode produced in a nitrate solution containing NaF, Cu(NO3)2, and SDS exhibited the most favorable electrochemical performance. Under these conditions, a prominent increase in imax (17 times of that for the sample with no additives and interlayer) and a notable decrease in oxygen evolution potential from 2.05 to 1.85 V were achieved.
- Subjects
LEAD oxides; ELECTROWINNING; ACCELERATED life testing; ELECTROCHEMICAL electrodes; SODIUM dodecyl sulfate; ELECTRODES; PLATINUM electrodes
- Publication
Journal of Applied Electrochemistry, 2023, Vol 53, Issue 8, p1563
- ISSN
0021-891X
- Publication type
Article
- DOI
10.1007/s10800-023-01867-2