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Electrode Passivation or 'Blocking'

When the species considered is produced and accumulates at the surface of the electrode, we have a special case where this species can eventually 'block' the surface by covering it or can precipitate in a different form because it reaches the solubility limit of a new compound, such as the formation of calcareous deposits on steel exposed to seawater.

Chemical gradient of product in the vicinity of a blocking electrode