Comparison Study of Adsorption of Cl-, Br-, and I- Ions from Dimethyl Formamide on In-Ga and Tl-Ga Electrodes

被引:8
作者
Emets, V. V. [1 ]
Damaskin, B. B. [2 ]
机构
[1] Russian Acad Sci, Frumkin Inst Phys Chem & Electrochem, Moscow 119991, Russia
[2] Moscow MV Lomonosov State Univ, Dept Chem, Moscow 119991, Russia
基金
俄罗斯基础研究基金会;
关键词
dimethyl formamide; indium-gallium; thallium-gallium; differential capacity; zero-charge potential; specific adsorption of halide ions; SOLVENTS; MERCURY; GALLIUM; SURFACE;
D O I
10.1134/S1023193511010071
中图分类号
O646 [电化学、电解、磁化学];
学科分类号
081704 ;
摘要
The adsorption of Cl-, Br-, and I- ions on the renewable liquid In-Ga and Tl-Ga electrodes from 0.1 M solutions in dimethyl formamide (DMF) is investigated by using the method of differential capacitance measurements. The results are compared with similar data obtained on Hg and Ga electrodes in DMF and with the corresponding data obtained in acetonitrile (AN). It is shown that, in DMF, the adsorption parameters and the series of surface activity of halide ions (Hal(-)) significantly depend on the metal nature. In contrast to Hg electrode, on which the surface activity of halide ions increases in the series: Cl- < Br- < I-, on In-Ga, as well as on the Ga electrode, it varies in the reverse order: I- < Br- < Cl-, whereas on the Tl-Ga electrode, partially reversed series of surface activity is observed: Br- < I- < Cl-. The results are explained within the framework of Andersen-Bockris model. An analysis of experimental results leads to the following qualitative conclusions: (1) on the In-Ga and Tl-Ga electrodes, as well as on Ga electrode, free energy of metal-Hal(-) interaction (G Delta(M Hal)-) Hincreases in series I- < Br- < Cl-; (2) for Cl-, Br-, and I-, (Delta G(M-Hal-)) grows in series Tl-Ga < In-Ga < Ga; (3) an absolute magnitude of Delta G(M-Hal1)- - Delta GM-Hal(2)(-) (Hal(1)(-), and Hal(2)(-) are any ions of Cl-, Br-, and I-) increases in series Hg < Tl-Ga < In-Ga < Ga; (4) the metal-DMF chemisorption interaction is much stronger than the metal-AN interaction and increases in series Tl-Ga < In-Ga < Ga.
引用
收藏
页码:89 / 95
页数:7
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