Abstract
A new convection-penetration model for mass transfer of indicator ions to a gas-evolving electrode at forced convection of solution is described theoretically. To check this model, the mass transfer coefficients for ferricyanide ions and ferrocyanide ions to, respectively, a hydrogen-evolving and an oxygen-evolving electrode in 1 M KOH and at 298K and various bulk-solution flow velocities have been determined in the usual way. The average diameter, cross-section and volume of detached bubbles and the efficiency of gas bubble evolution, have been determined photographically, however. It has been found that the mass transfer of indicator ions to a gas-evolving electrode can be described well by the new model. The contribution of an oxygen bubble departing from the electrode surface to the mass transfer is much greater than the contribution of a departing hydrogen bubble.
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