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4 Polish Journal of Chemistry

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The Adsorption and the Influence of Modified beta-Cyclodextrins on the Kinetics of Several Electrode Reactions

Trzciński D., Kośnik W., Stroka J., Temeriusz A.

Polish Journal of Chemistry

2004

Vol. 78 / nr 9

1149-1163

The adsorption of modified _-cyclodextrins (_-CD) on the mercury electrode was investigated in NaClO4 solutions using differential capacity measurements. The investigated cyclodextrins revealed stronger affinity towards mercury electrodes than native_-CD. Their behaviour was typical for a monolayer and consistent with that predicted by the Frumkin isotherm. The electrode kinetics of Cu2+/Cu(Hg) and Cd2+/Cd(Hg) couples was significantly inhibited in the presence of modified _-CD in the solutions while much faster in surfactant free solutions the electrode process of Tl+/Tl(Hg) system remained reversible also in the presence of CD's.

Mechanism and Kinetics of the Anodic Reaction in Cryolite Melts : I. The Influence of CaF2 (5 wt%) at Different Al2O3 Content

Kisza A., Thonstad J., Hives J.

Polish Journal of Chemistry

2000

Vol. 74, nr 4

549-558

Calcium fluoride is one of the two main components of the cryolite-based electrolyte in aluminium electrolysis. By Electrochamical Impedance Spectroscopy (EIS) the influence of CaF2 upon the kinetics and mechanism of the anodic reaction in 4 cryolite-alumina melts containing 2,4,6 and 8 wt% of alumina. The diddusion coefficient of the Al2OF2- anionic species decreases as a function of the alumina content, due to the increase of the melts viscosity.

Mechanism and Kinetics of the Anodic Reaction in Cryolite Melts : II. The Influence of AIF3(11 wt%) at Different Al2O3 Content

Kisza A., Thonstad J., Hives J.

Polish Journal of Chemistry

2000

Vol. 74, nr 7

1003-1010

Aluminium trifluoride is the main additive to the cryolite-based electrolyte in aluminium electrolysis. By Electrochemical Impedance Spectroscopy (EIS) the influence of AlF3 upon the kinetics and mechanism of the anodic reaction in 4 cryolite-alumina melts containing 2,4,6 and 8wt% of alumina and 11 wt% of AlF3 was determined at 1000 C.

The kinetics of the Sn(II)/Sn electrode reaction in pure molten tin dichloride

Kaźmierczak J., Kowalczewska K.

Polish Journal of Chemistry

1998

Vol. 72, nr 6

1037-1044

Results of electrochemical investigation of the Sn(II)/Sn electrode reaction in pure molten tin(II) chloride are presented. The exchange current density has been determined by relaxation and impedance methods as 1.6 A cm(-2) for the anodic and 1.2 A cm(-2) for the cathodic process, both exhibiting a weak temperature dependence. Both, the inductive model of a double layer of a metallic electrode immersed in its pure molten salt, and a barrierless electron transition have been confirmed.