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Université de Fribourg

Three-dimensional pore structure and ion conductivity of porous ceramic diaphragms

Wiedenmann, Daniel ; Keller, Lukas ; Holzer, Lorenz ; Stojadinović, Jelena ; Münch, Beat ; Suarez, Laura ; Fumey, Benjamin ; Hagendorfer, Harald ; Brönnimann, Rolf ; Modregger, Peter ; Gorbar, Michal ; Vogt, Ulrich F. ; Züttel, Andreas ; Mantia, Fabio La ; Wepf, Roger ; Grobéty, Bernard

In: AIChE Journal, 2013, vol. 59, no. 5, p. 1446–1457

The ion conductivity of two series of porous ceramic diaphragms impregnated with caustic potash was investigated by electrochemical impedance spectroscopy. To understand the impact of the pore structure on ion conductivity, the three-dimensional (3-D) pore geometry of the diaphragms was characterized with synchrotron x-ray absorption tomography. Ion migration was calculated based on an extended...