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Redox electrode



A redox electrode is an electrode made from electron-conductive material and characterized by high chemical stability in the solution under test. It is used for measuring the redox potential of a specific redox system in solution, and for electrochemical studies (investigation of electrochemical kinetics of interfacial processes).

Additional recommended knowledge

The correlation of an electrode potential and redox system composition can be described by the Nernst equation:

Ox + ne- = Red
E=E^0 + {RT \over nF}*\ln \left ({a_{\mathrm{ox}} \over a_\mathrm{red}}\right ),

where

E0 - standard potential of a specific redox system,
R - gas constant,
T - temperature in kelvins,
n - number of electrons taking part in a specific redox reaction,
F - Faraday constant
aox, ared - activity of oxidising and reducing participants in redox reaction.

There are two general classes of redox electrodes:

Illustration

A gold disk redox electrode with a Teflon shroud insulating the disk.

See also

 
This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Redox_electrode". A list of authors is available in Wikipedia.
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