Abstract
The total ohmic potential drop at rotating ring-disc electrodes (RRDE) has been studied for primary current distribution conditions with iron electrodes in slightly alkaline solutions (pH 8.4). It will be shown that the total ohmic potential drop consists of two parts, namely the “normal” IR-drop and a coupling influence caused by superposition of the individual potential fields of both the electrodes (ring or disc). On the basis of known potential fields near the single electrodes, theoretical considerations will be given in order to calculate or estimate the total IR-drop for a given RRDE system in dependence on the position of the Luggin capillary. Furthermore, it will be shown that an optimum compromise can be reached between “normal” IR-drop and coupling effect by appropriate positioning of the Luggin capillary. Conclusions for experimental work will be drawn.
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