Abstract
Double-layer parameters of a liquid Sn–Ga electrode in aqueous electrolyte solutions are studied. It is shown that Sn in the alloy with Ga is a surface-active component and is forced out onto a surface layer of the electrode. The double-layer parameters of an Sn–Ga electrode (8 at. % Sn), which are measured in the experimentally accessible range of charges, differ radically from the parameters of Ga electrodes and are close to those of Sn electrode. Hence, an Sn–Ga electrode containing 8 at. % Sn simulates electrochemical properties of a liquid Sn electrode. The difference between reciprocal “electronic” capacitances of Hg and Sn and a “corrected electrochemical work function” of Sn are determined. It is shown that the chemisorption interaction of an Sn–Ga electrode with water molecules is virtually absent at charges more negative than –7 μC/cm2. A potential drop on uncharged Sn, which is associated with water chemisorption, is –20 mV. Thus, the hydrophilicity of Sn is slightly higher than that of Hg, Bi–Ga, Pb–Ga, and Tl–Ga and significantly lower than that of In–Ga, Cd–Ga, and Ga.
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Emets, V.V., Damaskin, B.B. Electrical Double Layer on Liquid Sn–Ga Alloy in Aqueous Solutions. Russian Journal of Electrochemistry 40, 881–885 (2004). https://doi.org/10.1023/B:RUEL.0000041353.54448.92
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DOI: https://doi.org/10.1023/B:RUEL.0000041353.54448.92