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

In: Electrochemical Cell Design

Author

Listed:
  • Kyung-Hee Lim

    (Purdue University, School of Chemical Engineering)

  • Elias I. Franses

    (Purdue University, School of Chemical Engineering)

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.

Suggested Citation

  • Kyung-Hee Lim & Elias I. Franses, 1984. "Change in Overall Ohmic Resistance Due To Migration/Diffusion of Electrolytes," Springer Books, in: Ralph E. White (ed.), Electrochemical Cell Design, pages 337-356, Springer.
    • Handle: RePEc:spr:sprchp:978-1-4613-2795-0_17
    DOI: 10.1007/978-1-4613-2795-0_17
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