Exchange current density of adatoms

At the equilibrium potential both partial current densities are equal forming the exchange current density of adatoms i o,ads = I dep,free I = diss,ads From eq. (2.30 b), replacing Mads by Co.ads at E and e by F, one obtains with eq. (2.8)... 

The exchange current density of adatoms is a thermodynamically well defined quantity. It depends on the Nernst potential or on the respective ion activity, and is, in general, as long as M ee N holds, independent of the surface topography. 

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