A method for measuring the potential of a current-carrying electrode

Measurement of the potential of a current-carrying electrode is subject to error when the Luggin capillary of the reference electrode is situated in the path of the current through the electrolyte. This error can be avoided by siting the reference electrode behind a pin-hole through the main electrode, provided that no current flows through the hole. The method also permits the use of a reference electrode of moderate dimensions inserted directly into the cell electrolyte.