and Adsorption of Halide Ions from 0.1 M Solutions
on Liquid Cd
Ga and In
Ga Alloys in Gamma-Butyrolactone
V. V. Emetsa,z, A. A. Mel’nikova, and B. B. Damaskinb
aFrumkin Institute of Physical Chemistry and Electrochemistry, Russian Academy of Sciences,
Leninskii pr. 31, Moscow, 119071 Russia
bDepartment of Chemistry, Moscow State University, Moscow, 119991 Russia
Received December 26, 2014
Abstract—The double-layer characteristics of liquid renewable Cd–Ga (0.3 at % Cd) and In–Ga (14.2 at % In)
electrodes in the gamma-butyrolactone (GBL) solutions of various electrolytes are studied by measuring the
differential capacitance and using the method of open-circuit jet electrode. For the (Cd–Ga)/GBL and (In–
Ga)/GBL interfaces, the zero-charge potentials, which are not distorted by the specific adsorption of ions, and
the chemisorption potential drops of solvent are determined. It is shown that, in spite of the fact that the work func-
tion decreases as we pass from (In–Ga) to (Cd–Ga), the chemisorption potential drops of solvent on both elec-
trodes are close. This behavior is explained by a closer approach of GBL dipoles to the surface of (Cd@
@Ga)
electrode providing more effective overlapping of donor–acceptor levels of metal and solvent. It is shown that, in
GBL, the adsorption parameters of halide ions and their surface activity series depend on the metal nature. On the
(Cd–Ga) and (In–Ga) electrodes, the reversed surface activity series of halide ions is observed: on the Hg electrode
in various solvents, the surface activity increases in the series Cl– < Br– < I–, whereas on the (Cd–Ga) and (In–Ga)
electrodes in GBL, it varies in the reverse series I– < Br– < Cl–.
Keywords: gamma-butyrolactone, electrical double layer, differential capacitance, charge, zero-charge poten-
tial, cadmium–gallium and indium–gallium alloys, specific adsorption of halide ions
DOI: 10.1134/S1023193516010031
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