Gouy-Chapman theoiy

With the ionic cloud on the electrode, the resemblance of the Gouy—Chapman model to that of the theoiy of ion-ion interactions in solution reviewed in Chapter 3 is evident. There, it was necessary to arbitrarily choose one ion and spotlight it as the central ion, or source, of the field. Here, the discussion resolves on ion-electrode interactions with the electrode as the source of the field. The response of an ion, however, does not depend on how the electric field is produced (i.e., whether the source is a central ion or a charged electrode). It depends only on the value of the field at the location of the ion. Hence, the electrostatic arguments in the problems of ion-ion interactions and ion-electrode interactions must be similar. 

The theoiy outlined above is a takeoff on the Debye Huckel theory of ionic solvation. In the electrochemistry literature it is known as the Gouy-Chapman theory. The Debye screening length is seen to depend linearly on ff and to decrease as (z+n+ +z zi ) /2 with increasing ionic densities. For a solution of monovalent salt, where z+ = z = 1 and = = n, this length is given by... 

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See also in sourсe #XX -- [ , ]

See also in sourсe #XX -- [ , ]

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