The Electrical Double Layer at the Bi–Ga Liquid Alloy in the Acetonitrile Electrolyte Solutions

ISSN： 1023-1935

Source： Russian Journal of Electrochemistry, Vol.40, Iss.10, 2004-10, pp. : 1066-1073

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Abstract

The electrical double layer (EDL) characteristics of a Bi (0.25 at. %)–Ga liquid electrode in acetonitrile are studied. In acetonitrile, as in water, the electrode models Bi electrodes in their electrochemical properties. In contrast to aqueous solutions, in acetonitrile solutions it is possible to study the EDL structure not only at negative charges but also near the zero charge and at small positive charges. In acetonitrile, the electrode's potential of zero charge not distorted by specific ion adsorption and the “corrected electrochemical work function” are determined. The electrode is as lyophilic with respect to acetonitrile as Hg. Thus, the orientation of acetonitrile dipoles on Hg and Bi is identical at negative charges. The obtained data and data for a partially fused polycrystalline electrode in aqueous solutions are used to determine contributions of semimetal properties of a Bi electrode to the capacitance of the inner part of EDL and to a potential drop. The charge dependences of these contributions are found.