In electrochemistry, the electrochemical potential is a size Thermodynamique, in Joules/moles, equivalent to the chemical Potentiel but taking account of the species electrically charged. One should not confuse with the potential electrode in Volts. This concept is typically used for the chemical processes where the diffusion intervenes, in particular in biochemistry where it determines the flow of the Ion S through a given surface but also for the comprehension of the Conduction in the Semi-conducteur S.

It as follows is defined:

$\backslash \; tilde\; \{\backslash \; mu\_i\}\; =\; \backslash \; mu\_i\; +\; z\_i\; F\; \backslash \; phi^j$

$\backslash \; mu\_i$ is the chemical potential of the species $i$;

$z\_i\; F$, its electric charge, $z\_i$ being its number of load and $F$ being the Faraday;

$\backslash \; phi^j$ is the electrostatic potential of the phase J, also called Potentiel Galvani .