Change in Overall Ohmic Resistance Due To Migration/Diffusion of Electrolytes

Kyung-Hee Lim and Elias I. Franses
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Kyung-Hee Lim: Purdue University, School of Chemical Engineering
Elias I. Franses: Purdue University, School of Chemical Engineering

A chapter in Electrochemical Cell Design, 1984, pp 337-356 from Springer

Abstract: Abstract For dilute binary electrolytes, solution of the coupled continuity and Poisson’s equation reveals a novel phenomenon. If only the cation reacts at both electrodes, being produced at the anode and consumed at the cathode, and if the cation is more mobile than the anion, then the potential difference at fixed current decreases with time. This decrease is equivalent to the current increasing with time at fixed potential difference. Both are equivalent to the overall ohmic resistance (△V/I) decreasing with time. Such decrease was observed with an aqueous solution of 1.5 mM sodium di-(2-ethylhexyl) sulfosuccinate and zinc electrodes. If, now, both ions react at the electrodes, the potential difference should increase with time in most cases. When it decreases, the decrease is not pronounced. Moreover, then the potential difference decreases only up to a certain time after which it increases with time.

Keywords: Concentration Polarization; Critical Micellization Concen; Zinc Sulfate; Fixed Current; Zinc Electrode (search for similar items in EconPapers)
Date: 1984
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DOI: 10.1007/978-1-4613-2795-0_17

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