Abstract
The anodic oxidation of potassium bromide to potassium bromate is performed in an undivided cell with hydrogen evolution the major reaction at the counter electrode. The cell used is a dished electrode membrane (DEM) cell. Current density distribution, measured using a segmented electrode, shows a variation in the two principle dimensions; along the length of the electrode and over the width of the electrode. Current densities are highest at the electrolyte flow inlet and also exhibit a localized maximum along the electrode length. The variation in current density is due to the influence of electrolytic gas evolution on the effective electrolyte conductivity and mass transport and also due to the change in shape of the dished electrode, which influences mass transport, electrical potential field and flow at the cell inlet and exit.
This is a preview of subscription content, log in via an institution to check access.
Similar content being viewed by others
References
H. Vogt, ‘Gas Evolving Electrode’ in ‘Comprehensive Treatise of Electrochemistry’, Vol. 6 (edited by E. Yeager, J. O'M. Bockris, B. E. Conway and S. Sarangapani), Plenum Press, New York (1983).
W. S. Wu and G. P. Rangaiah, J App. Electrochem. 23 (1993) 1139.
G. H. Sedahmed, ibid. 10 (1980) 351.
A. M. Ahmed and G. H. Sedahmed, J. Electrochem. Soc. 135 (1988) 2766.
K. Scott and B. Hayati, Symposium On Electrochemical Cell Design and Optimisation Procedures, Dechema, 24–26 Sept. (1990).
H. Vogt, Electrochim. Acta 23 (1978) 203.
C. I. Elsner and S. L. Maarchiano, J. App. Electrochem. 12 (1982) 735.
L. J. J. Janssen, ibid. 17 (1987) 1177.
H. Vogt, ibid. 19 (1989) 713.
M. G. Fouad and G. H. Sedahmed, Electrochim. Acta 18 (1973) 55.
L. J. J. Janssen and E. Barendrecht, ibid. 24 (1979) 693.
M. F. Sherbiny, A. A. Zatout, M. Hussien and G. H. Sedahmed, J. App. Electrochem. 21 (1991) 537.
O. N. Cavatorta, U. Böhm and A. M. Chiappori De Del Giorgio, J. App. Electrochem. 21 (1991) 40.
P. J. Sides, ‘Modern Aspects of Electrochemistry’, No. 18 (edited by R. E. White), Plenum Press, New York (1986), p. 303.
N. Ib1, Electrochim. Acta 24 (1979) 1105.
L. Sigrist, O. Dossenbach and N. Ib1, Int. J. Heat & Mass Transfer 22 (1979) 1393.
C. W. Tobias, J. Electrochem. Soc. 106 (1959) 833.
J. E. Funk and J. F. Thorpe, ibid. 116 (1969) 48.
Y. Nishiki, K. Aoki, K. Tokuda and H. Matsuda, J. App. Electrochem. 16 (1986) 615.
I. Roušar, V. Cezner and J. Hostomsky, Collect. Czech. Chem. Comm. 36 (1971) 1.
I. Roušar, V. Cezner, J. Nejepsova, M. M. Jackson, M. Spasojevie and B. Z. Nikolic, J. App. Electrochem. (1977) 427.
I. Roušar, J. Electrochem. Soc. 116 (1969) 676.
J. M. Bisang, J. App. Electrochem. 21 (1991) 760.
L. J. J. Janssen and C. J. Visser, ibid. 21 (1991) 753.
L. R. Czarnetzki and L. J. J. Janssen, ibid. 19 (1989) 630.
J. M. Bisang, ibid. 23 (1993) 966.
P. Millington and D. Blum, ‘Electrosynthesis from Laboratory, to Pilot, to Production’, (edited by J. D. Genders and D. Pletcher), The Electrosynthesis Co., New York (1990), chapter 12.
K. Scott, ‘Electrochemical Processes for Clean Technology’, Royal Society of Chemistry, Cambridge, UK (1995).
K. Scott, ‘Electrochemical Engineering and Energy’, (edited by F. Lapicque, A. Storck and A. A. Wragg), Plenum Press, London (1994), p. 141.
P. Cettou, P. M. Robertson and N. Ibl, Electrochim. Acta 29 (1984) 875.
W. Taama, ‘Mass Transfer Studies in a DEM Electro-chemical Cell’ PhD thesis, University of Newcastle, UK (1991).
D. J. Economou, MS thesis, University of Illinois, IL (1983).
Author information
Authors and Affiliations
Rights and permissions
About this article
Cite this article
Scott, K., Taama, W. & Williams, B.R. A study of current distribution in a DEM cell during bromate formation. Journal of Applied Electrochemistry 28, 259–268 (1998). https://doi.org/10.1023/A:1003255430866
Issue Date:
DOI: https://doi.org/10.1023/A:1003255430866