Abstract
A comparison was made of the bubbles formed on a horizontal bottom-facing electrode in a physical analogue model with those formed electrolytically. Bubbles formed in a physical analogue model by forcing air through a porous plate are larger, with wetted clear areas between bubbles. In contrast, electrolytically generated gas bubbles are smaller and the electrode surface is covered with a foamy layer of tiny bubbles. To measure the bubble resistance on horizontal electrodes, a method was developed for vertical electrodes so that the measurements may be validated by comparison with published data. Voltage fluctuations were measured and analysed using fast Fourier transform (FFT). The magnitude of the bubble impedance was obtained at a superimposed a.c. frequency f0. The phase angle caused by the effects of the double layer capacitance and the faradaic impedance on bubble resistance were determined. The effects of the faradaic impedance and the double layer capacitance were shown to be negligibly small under experimental conditions.
Similar content being viewed by others
References
K. Grjotheim and B. J. Welch, `Aluminium Smelting Technology', 2nd edn, Aluminium Verlag (1988), pp. 175–182.
W. H. Haupin, in `Production of Aluminium and Alumina', 2nd edn (edited by A. R. Burkin), John Wiley & Sons, Chichester (1987) pp. 150–58.
W. E. Haupin, J. Metals Oct. (1971) 46–9.
G. J. Houston, M. P. Taylor, D. J. Williams and K. Grjotheim, Light Metals 1988 117th Annual Meeting of AIME (1988) 641–5.
B. E. Bongenaar-Schlenter, L. J. J. Janssen, S. J. D. van Stralen and E. Barendrecht, J. Appl. Electrochem. 15 (1985) 537–48.
F. Hine and K. Murakami, J. Electrochem. Soc. 127 (1980) 292–7.
A. Solheim and J. Thonstad, Light Metals 1986, 115th Annual Meeting of AIME (1986) 379–403.
R. Dorin and E. J. Frazer, J. Appl. Electrochem. 23 (1993) 933–42.
D. A. G. Bruggeman, Ann. Phys. 24 (1935) 636–64.
J. Newman, J. Electrochem. Soc. 117 (1970) 507–8.
T. M. Hyde and B. J. Welch, CHEMECA 92, Canberra, Australia, 27-30 Sept. (1992), 2, pp. 161–8.
W. E. Haupin and W. B. Frank, in `Comprehensive Treatise of Electrochemistry', 2, (edited by O'M. Bockris, et al., Plenum Press, London (1981) pp. 301–25.
J. Thonstad, Electrochim. Acta No. 15 (1970) 1569–80.
E. W. Dewing and E. Th. van der Kouwe, J. Electrochem. Soc. 122 (1975) 358–63.
R. W. Ramire, `The FFT, Fundamentals and Concepts', Prentice-Hall, Englewood Cliffs, NJ (1985), pp. 17–59.
G. E. Williams and B. J. Prinmore, `Electrical Engineering', Heinemann, London (1963), pp. 182–3.
J. Koryta, J. Dvorak and L. Kavan, `Principles of Electrochemistry', J. Wiley & Sons, New York 2nd edn (1993) pp. 301–2.
K. B. Oldham and J. C. Myland, `Fundamentals of Electrochemical Science', Academic Press, San Diego (1994) pp. 367–73.
P. Delahay, `New Instrumental Methods in Electrochemistry', Interscience Publication, New York (1954) pp. 146–8.
C. W. Tobias, J. Electrochem. Soc. 106 (1959) 833–8.
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
QIAN , K., J.CHEN , J.J. & MATHEOU , N. Visual observation of bubbles at horizontal electrodes and resistance measurements on vertical electrodes. Journal of Applied Electrochemistry 27, 434–440 (1997). https://doi.org/10.1023/A:1018465705058
Issue Date:
DOI: https://doi.org/10.1023/A:1018465705058