Electrochemical impedance spectroscopy was used for investigation of camphor surface activity on copper electrode in acid sulphate solutions. A large frequency dispersion of the differential capacitance is indicative of development of non-equilibrium adsorption layers involving slow relaxation processes. A rather weak adsorption of camphor is enhanced by bromide anions, especially in the presence of Cu(II). The respective orientation of adsorbed camphor dipoles results in the positive shift of the zero-charge potential. The model of the adsorption layer is suggested, according to which specifically adsorbed halides act as species bridging the copper substrate with Cu(I)-camphor surface complexes. Nevertheless, this does not lead to the exclusion of surface water and formation of two-dimensional condensed adsorption layers that are typical of less hydrophilic metals.

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