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Zinc deposition and dissolution in a flow-through porous electrode

✍ Scribed by C. Cachet; R. Wiart; J. Zoppas-Ferreira

Publisher: Elsevier Science
Year: 1993
Tongue: English
Weight: 626 KB
Volume: 38
Category: Article
ISSN: 0013-4686
DOI: 10.1016/0013-4686(93)85145-o

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✦ Synopsis

In a circulating alkaline electrolyte, the current-potential curves and impedance plots reveal that a flow-through electrode made of zinc particles is quasi-blocked by a surface layer near the equilibrium potential and sharply activated at either anodic or cathodic polarizations . For slightly clogged pores, the results of Electrode Impedance Spectroscopy (EIS) are shown to agree with the De Levie model of cylindrical pores . A least square fitting gives the potential dependencies of both the geometrical parameters of pores and the penetration depth of current . It is concluded that even with a forced convection, the penetration depths of anodic and cathodic currents remain very small .

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