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Rotating ring-disk electrode
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Rotating ring-disk electrode : ウィキペディア英語版
Rotating ring-disk electrode
A rotating ring-disk electrode (RRDE)〔Albery W.J.; Hitchman M.L. Ring-Disc Electrodes Oxford: Clarendon Press 1971 (ISBN 978-0198553496)〕 is double working electrode used in hydrodynamic voltammetry, very similar to a rotating disk electrode (RDE).〔Bard, A.J.; Faulkner, L.R. Electrochemical Methods: Fundamentals and Applications. New York: John Wiley & Sons, 2nd Edition, 2000.〕 The electrode actually rotates during experiments inducing a flux of analyte to the electrode. These working electrode are used in electrochemical studies when investigating reaction mechanisms related to redox chemistry among other chemical phenomena.
== 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.

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