The Influence of teh Experimental Setup Upon the Modelling of the Impedance Spectra in Molten Salts

• Autorzy: Kisza A. , Kaźmierczak J. , Meisner B.
• Języki publikacji: EN

Abstrakty

EN

To settle the frequently raised problem of the influence of cell geometry on the value of the evaluated by the electrochemical impedance spectroscopy (EIS) double layer capacitance, in this paper two types of cells have been tested in two and three electrodes experiments in molten salts. In the first type cell, the working silver electrodes were immersed directly in the molten NaCl - KCl eutectic mixture at 700°C, while in the second type cell, the working silver electrodes were placed inside quartz tubes connected to the bulk melt by a small hole. The only effect of the quartz tube was the desired increase of the electrolyte resistance from 0.7_ to 5.5 _, which is important in lowering the ac measuring current of the Solartron 1260 Phase Gain Analyser. The evaluated values of the double layer capacitance were to experimental uncertainty the same in both cells. It can be thus concluded, that the frequently raised in aqueous electrolytes problem of the influence of the cell geometry upon the values of the evaluated double layer capacitance, in molten salts does not lead to any significant errors. This is presumable due to the fact that the conductivity of molten salts is usually two order higher than aqueous electrolytes, and the corresponding ohmic drops are much smaller.

Słowa kluczowe

EN

molten salt; silver electrode; double layer capacitance; polarizable electrode; electrochemical impedance spectroscopy

• Wydawca: Polskie Towarzystwo Chemiczne
• Czasopismo: Polish Journal of Chemistry
• Rocznik: 2004
• Tom: Vol. 78 / nr 9
• Strony: 1235--1244
• Opis fizyczny: Bibliogr. 9 poz., rys.

Twórcy

autor

Kisza A.

• Faculty of Chemistry, University of Wrocław, ul. F. Joliot-Curie 14, 50-383 Wrocław, Poland

autor

Kaźmierczak J.

• Faculty of Chemistry, University of Wrocław, ul. F. Joliot-Curie 14, 50-383 Wrocław, Poland

autor

Meisner B.

• Faculty of Chemistry, University of Wrocław, ul. F. Joliot-Curie 14, 50-383 Wrocław, Poland

Bibliografia

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• 5. Kisza A., Kaźmierczak J., Borrensen B., Haarberg G.M. and Tunold R. J. Appl. Electrochem., 25, 940 (1995).
• 6. Kisza A., J. Electroanal. Chem., 534, 99 (2002).
• 7. Kisza A., Kaźmierczak J. and Meisner B., Polish J. Chem., 78, 561 (2004).
• 8. Boucamp B., Equivalent Circuit, University of Twente, Holland, 1988/89.
• 9. Mac Donald J.R., Complex non-linear least squares immitance fitting program, Dep. of Physics and Astronomy, University of North Carolina, Chapel Hill, NC.