Specific adsorption of bromide and iodide ions from N-methyl formamide solutions with constant ionic strength on liquid ga electrodeстатья
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Дата последнего поиска статьи во внешних источниках: 18 июля 2013 г.
Авторы:
Emets V.V. ,
Damaskin B.B.
Журнал:
Russian Journal of Electrochemistry
Том:
48
Номер:
1
Год издания:
2012
Издательство:
Maik Nauka/Interperiodica Publishing
Местоположение издательства:
Russian Federation
Первая страница:
26
Последняя страница:
35
DOI:
10.1134/S1023193512010089
Аннотация:
The differential capacitance curves were measured with an ac bridge in the Ga/[N-MF + 0.1 m M KBr + 0.1 (1 - m) M KClO 4] and Ga/[N-MF + 0.1 m M KI + 0.1 (1 - m) M KClO 4] systems at the following fractions m of surface-active anions: 0, 0.01, 0.02, 0.05, 0.1, 0.2, 0.5, and 1. As compared with other solvents, N-methyl formamide (N-MF) enables one to realize the largest positive charges of Ga electrode, at which it remains ideally polarizable (up to 20 μC/cm2). The data on the specific adsorption of Br - and I - anions in the system can be quantitatively described by the Frumkin’s isotherm; to the first approximation, free energy of halide ion (Hal -) ΔG adsHal-1 adsorption is a linear function of electrode charge. It is found that, in contrast to the Hg/N-MF interface, ΔG adsHal-1 at the Ga/N-MF interface varies in the reverse order: Br - I - < Cl -. From the measured results, we can conclude that the energy of metal-Hal- interaction increases in series: ΔG M-CI < Δ GM-Br- and the difference is larger than the difference between the solvation energies of Hal - (ΔG s-Hal2-). © Pleiades Publishing, Ltd., 2012.
Добавил в систему:
Дамаскин Борис Борисович