Abstract: The effect of bubble accumulation on anodic potential and current in the conversion of Fe2+/Fe3+ under porous electrodes (316L, ε = 78.73, ae = 11 150 m2 m−3) is studied. It was observed that when the electrolyte flow is under 2 mL s−1 and the electrode thickness (L) is greater than 0.62 mm, the coalescence of bubbles blocks the electrode, thereby reducing the electroactive area and increasing the electrical resistance, which produces elevation and important oscillations in anodic potential. For higher flows between 8 and 16 mL s−1, the potential tends to be uniform over time. The average measurement of anodic potential indicated that for working conditions of I = 0.1 A, L = 0.64 mm, the flow increases from 2 to 8 mL s−1, reducing the average anodic potential value by 35%, while for I = 0.5 A, L = 1.86 mm, flow of 2 and 16 mL s−1 reduces the average anodic potential by approximately 11%.
KEYWORDS: Porous electrode, parallel volumetric cell, potential and current distribution
2022 - Avenida Brasil 2162, Valparaíso, en la Facultad de Ingeniería de la Pontificia Universidad Católica de Valparaíso.