Abstract
A technique of contact electroresistance (CER) of two identical specimens placed in the same electrolyte under potentiostatic control is considered in detail, a scheme of the measuring unit is shown, and formulas for the calculation of CER are given. The conditions under which a relative CER increase caused by the adsorption is independent of the conditions of measurements are discussed. An estimation of the electrode surface coverage with an adsorbate, on the basis of CER data, is shown to be possible when the adsorbate completely or substantially insulates the surface sites covered. As an example, the dependences of the metal surface coverage with fluoride, hydroxide, and borate ions below the equilibrium potential of the formation of primary oxides of these metals are considered. A possible mechanism of the generation of a signal in the CER technique based on the electron tunneling in macrocontacts is discussed The kinetic data on submonolayer electrochemical oxidation of silver and copper are given. The adsorption of anions accompanied with a partial charge transfer is considered on copper, silver, and gold.
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The work was financially supported by the Russian Foundation for Basic Research (project no. 97-03-32426).
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Marichev, V.A. The contact electroresistance technique for thein situ investigation of metal surfaces in electrolytes: Review. Prot Met 36, 1–16 (2000). https://doi.org/10.1007/BF02766733
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DOI: https://doi.org/10.1007/BF02766733