Faculté des sciences

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

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

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... More

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    Summary
    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.