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; La Mantia, Fabio; Wepf, Roger; Grobéty, Bernard

doi:10.1002/aic.14094

Publication type:	Article in scientific journal
Type of review:	Peer review (publication)
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
DOI:	10.1002/aic.14094
Published in:	AIChE Journal
Volume(Issue):	59
Issue:	5
Page(s):	1446
Pages to:	1457
Issue Date:	2013
Publisher / Ed. Institution:	Wiley
ISSN:	1547-5905 0001-1541
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.
URI:	https://digitalcollection.zhaw.ch/handle/11475/2188
Fulltext version:	Published version
License (according to publishing contract):	Licence according to publishing contract
Departement:	School of Engineering
Organisational Unit:	Institute of Computational Physics (ICP)
Appears in collections:	Publikationen School of Engineering

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Wiedenmann, D., Keller, L., Holzer, L., Stojadinović, J., Münch, B., Suarez, L., Fumey, B., Hagendorfer, H., Brönnimann, R., Modregger, P., Gorbar, M., Vogt, U. F., Züttel, A., La Mantia, F., Wepf, R., & Grobéty, B. (2013). Three-dimensional pore structure and ion conductivity of porous ceramic diaphragms. AIChE Journal, 59(5), 1446–1457. https://doi.org/10.1002/aic.14094

Wiedenmann, D. et al. (2013) ‘Three-dimensional pore structure and ion conductivity of porous ceramic diaphragms’, AIChE Journal, 59(5), pp. 1446–1457. Available at: https://doi.org/10.1002/aic.14094.

D. Wiedenmann et al., “Three-dimensional pore structure and ion conductivity of porous ceramic diaphragms,” AIChE Journal, vol. 59, no. 5, pp. 1446–1457, 2013, doi: 10.1002/aic.14094.

WIEDENMANN, Daniel, Lukas KELLER, Lorenz HOLZER, Jelena STOJADINOVIĆ, Beat MÜNCH, Laura SUAREZ, Benjamin FUMEY, Harald HAGENDORFER, Rolf BRÖNNIMANN, Peter MODREGGER, Michal GORBAR, Ulrich F. VOGT, Andreas ZÜTTEL, Fabio LA MANTIA, Roger WEPF und Bernard GROBÉTY, 2013. Three-dimensional pore structure and ion conductivity of porous ceramic diaphragms. AIChE Journal. 2013. Bd. 59, Nr. 5, S. 1446–1457. DOI 10.1002/aic.14094

Wiedenmann, Daniel, Lukas Keller, Lorenz Holzer, Jelena Stojadinović, Beat Münch, Laura Suarez, Benjamin Fumey, et al. 2013. “Three-Dimensional Pore Structure and Ion Conductivity of Porous Ceramic Diaphragms.” AIChE Journal 59 (5): 1446–57. https://doi.org/10.1002/aic.14094.

Wiedenmann, Daniel, et al. “Three-Dimensional Pore Structure and Ion Conductivity of Porous Ceramic Diaphragms.” AIChE Journal, vol. 59, no. 5, 2013, pp. 1446–57, https://doi.org/10.1002/aic.14094.