Abstract

The current efficiency of a laboratory aluminium cell was determined as a function of interpolar distance, current, and temperature and composition of the electrolyte. For interpolar distances greater than 30mm, the current efficiency was independent of this parameter. The loss of current efficiency was found to be inversely proportional to the cubic root of the current passing through the cell. The results can be explained by assuming that the back reaction is controlled both by the solubility of aluminium in the melt, and the transport of the reacting species to and from the gas/melt interphase.

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