Three-electrode cells comprise (1) an indicator (or test) electrode or a working electrode
, at the surface of which processes that are of interest may occur, (2) a reference electrode
and (3) a third electrode, the auxiliary or counter electrode, which serves merely to carry the current flowing through the cell, and at the surface of which no processes of interest occur. If processes of interest occur at both the anode
and the cathode
of a cell (as in differential amperometry or controlled current potentiometric titration
with two indicator electrodes), the cell should be said to comprise two indicator (or test) working electrodes.
IUPAC. Compendium of Chemical Terminology, 2nd ed. (the "Gold Book"). Compiled by A. D. McNaught and A.Wilkinson. Blackwell Scientific Publications, Oxford (1997). XML on-line corrected version: http://goldbook.iupac.org (2006-) created by M. Nic, J. Jirat, B. Kosata; updates compiled by A. Jenkins. ISBN 0-9678550-9-8. doi:10.1351/goldbook