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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.