Structure
The difference between a rotating ring-disk electrode and a rotating disk electrode is the addition of a second working electrode in the form of a ring around the central disk of the first working electrode. The two electrodes are separated by a non-conductive barrier and connected to the potentiostat through different leads. To operate such an electrode it is necessary to use a bipotentiostat or some potentiostat capable of controlling a four electrode system. This rotating hydrodynamic electrode motif can be extend to rotating double-ring electrodes and rotating double-ring-disk electrodes and other even more esoteric constructions as suited to a given experiment.
Read more about this topic: Rotating Ring-disk Electrode
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—Jean Baker Miller (20th century)
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—Donald Davidson (b. 1917)