Specific adsorption of Cl−, Br−, and I− ions on liquid Ga electrode from N-methylformamide solutions

Emets, V.V.; Damaskin, B.B.

Авторы: Emets V.V., Damaskin B.B.
Журнал: Journal of Electroanalytical Chemistry
Том: 667
Номер: 1
Год издания: 2012
Издательство: Elsevier Sequoia
Местоположение издательства: Switzerland
Первая страница: 76
Последняя страница: 84
DOI: 10.1016/j.jelechem.2011.11.023
Аннотация: An ac bridge is used to measure the differential capacitance curves in the systems of Ga/[N-MF + 0.1m M KCl + 0.1(1 − m) M KClO4], Ga/[N-MF + 0.1m M KBr + 0.1(1 − m) M KClO4], and Ga/[N-MF + 0.1m MKI + 0.1(1 − m) M KClO4] for the following values of fraction m of the surface-active anion: 0, 0.01, 0.02, 0.05, 0.1, 0.2, 0.5, and 1. As compared to other solvents, N-methylformamide (N-MF) allows achieving much higher positive charges of the Ga electrode, at which it remains ideally polarizable (up to 20 and in some cases 30 μC/cm2). The values of fraction m of the surface-active anion, 0.05, 0.1, 0.2, 0.5, and 1, are used to calculate adsorption parameters for model based on the Frumkin isotherm, in which free adsorption energy ΔGads is a function of the electrode charge. It is found that the ΔGads value at the Ga/N-MF interface changes inversely, Br− ≈ I− < Cl−, to the sequence observed on the Hg/N-MF interface. The obtained results can be used for the unique assessment of an increase in the metal–Hal− interaction energy in the series of > > and of difference () exceeding the difference of solvation energies of Hal− (). Article Outline
Добавил в систему: Дамаскин Борис Борисович

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Specific adsorption of Cl−, Br−, and I− ions on liquid Ga electrode from N-methylformamide solutionsстатья