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Contradictory concepts in tortuosity determination in porous media in electrochemical devices

Tjaden, B; Finegan, DP; Lane, J; Brett, DJL; Shearing, PR; (2017) Contradictory concepts in tortuosity determination in porous media in electrochemical devices. Chemical Engineering Science , 166 pp. 235-245. 10.1016/j.ces.2017.03.051. Green open access

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Abstract

Porous media are a vital component in almost every electrochemical device in the form of electrode, support or gas diffusion layers. Microstructural parameters of porous layers such as tortuosity, porosity and pore size diameter are of high importance and crucial for diffusive mass transport calculations. Among these parameters, the tortuosity remains ill-defined in the field of electrochemistry, resulting in a wide range of different calculation approaches. Here, we present a systematic approach of calculating the tortuosity of different porous samples using image and diffusion cell experimental-based methods. Image-based analyses include a selection of geometric and flux-based tortuosity calculation algorithms. Differences between the image and diffusion cell-based results are encountered and attributed to the small pore diameters and thereby induced Knudsen effects within the samples which govern the diffusion flux.

Type: Article
Title: Contradictory concepts in tortuosity determination in porous media in electrochemical devices
Open access status: An open access version is available from UCL Discovery
DOI: 10.1016/j.ces.2017.03.051
Publisher version: http://doi.org/10.1016/j.ces.2017.03.051
Language: English
Additional information: This version is the author accepted manuscript. For information on re-use, please refer to the publisher’s terms and conditions.
Keywords: TortuositySimulationX-ray tomographyDiffusion cell experiments
UCL classification: UCL
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Engineering Science > Dept of Chemical Engineering
URI: https://discovery.ucl.ac.uk/id/eprint/1557688
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