Electrochemical characterization of porous diaphragms in development for gas separation

Stojadinović, J.; Wiedenmann, Daniel; Gorbar, M.; Mantia, F. La; Suarez, L.; Herzog, V. Zakaznova; Vogt, U. F.; Grobéty, Bernard; Züttel, Andreas

doi:10.1149/2.002204eel

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Journal article

Electrochemical characterization of porous diaphragms in development for gas separation

Stojadinović, J. EMPA, Materials Science and Technology, Hydrogen & Energy, Dübendorf, Switzerland
Wiedenmann, Daniel EMPA, Materials Science and Technology, Hydrogen & Energy, Dübendorf, Switzerland - University of Fribourg, Department Geosciences and FRIMAT, Fribourg, Switzerland
Gorbar, M. EMPA, Materials Science and Technology, Hydrogen & Energy, Dübendorf, Switzerland
Mantia, F. La University of Bochum, Department Chemistry and Biochemistry, Germany
Suarez, L. EMPA, Materials Science and Technology, Hydrogen & Energy, Dübendorf, Switzerland
Herzog, V. Zakaznova EMPA, Materials Science and Technology, Hydrogen & Energy, Dübendorf, Switzerland
Vogt, U. F. EMPA, Materials Science and Technology, Hydrogen & Energy, Dübendorf, Switzerland
Grobéty, Bernard University of Fribourg, Department Geosciences and FRIMAT, Fribourg, Switzerland
Züttel, Andreas EMPA, Materials Science and Technology, Hydrogen & Energy, Dübendorf, Switzerland

24.08.2012

Published in:

ECS Electrochemistry Letters. - 2012, vol. 1, no. 4, p. F25-F28

English The alkaline electrolyzer industry is facing the imminent necessity of replacing the asbestos diaphragms with a separator made of a new environmentally friendly material. The influence of a diaphragm's material and porosity on the ionic conductivity was studied for asbestos, zirconium dioxide, wollastonite and olivine diaphragms. Developed electrochemical impedance spectroscopy (EIS) set-up with four-electrode cell offers the possibility for an accurate measurement of diaphragms’ ionic conductivity and enables its correlation to the materials porosity and tortuosity. The ion conductivity of investigated diaphragms approaches zero value for total porosities below 20% and increases when increasing porosities in agreement with Archie's law.

Faculty

Faculté des sciences et de médecine

Department

Département de Géosciences

Language