Title: Three-dimensional pore structure and ion conductivity of porous ceramic diaphragms
Authors : 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
La Mantia, Fabio
Wepf, Roger
Grobéty, Bernard
Published in : American Institute of Chemical Engineers Journal (AIChE)
Volume(Issue) : 59
Issue : 5
Pages : 1446
Pages to: 1457
Publisher / Ed. Institution : John Wiley & Sons, Inc.
Issue Date: 2013
License (according to publishing contract) : Licence according to publishing contract
Type of review: Peer review (Publication)
Language : English
Subjects : Map; SOFC
Subject (DDC) : 540: Chemistry
620.11: Engineering materials
Abstract: 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 pore structure model, which includes the electrolyte conductivity and geometric pore parameters, for example, tortuosity (τ) and constriction factor (β), but no fitting parameters. The calculated ion conductivities are in agreement with the data obtained from electrochemical measurements on the diaphragms. The geometric tortuosity was found to be nearly independent of porosity. Pore path constrictions diminish with increasing porosity. The lower constrictivity provides more pore space that can effectively be used for mass transport. Direct measurements from tomographs of tortuosity and constrictivity opens new possibilities to study pore structures and transport properties of porous materials.
Departement: School of Engineering
Organisational Unit: Institute of Computational Physics (ICP)
Publication type: Article in scientific Journal
DOI : 10.1002/aic.14094
ISSN: 0001-1541
URI: https://digitalcollection.zhaw.ch/handle/11475/2188
Appears in Collections:Publikationen School of Engineering

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