Tomography based screening of flow field

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Abstract: Current collectors in PEM water electrolysis perform several functions that influence overall performance. These include conducting heat and electrons, as well as transporting water and gas. X-ray tomography, standardized reconstruction, and calculation methods are used to compare the morphological and transport parameters of eight different current collectors functioning as flow fields for PEM water electrolysis. We find simple exponential relations between through-plane thermal conductivity λ and porosity p λ_(20°C) ((p)=1749p^(-1.306)-4.420)), as well as between through-plane electrical conductivity σ and water permeability K (σ(K)=10^(-6)*K^(-0.6376)). In addition, we use both local and global concepts to investigate the pore space of current collectors. We hereby investigate homogeneity and characteristic sizes, like mean pore diameter or mean distance between solid parts at the catalytic interface. Moreover, we find that the local concept of mean chord lengths can be used to explain electrical and thermal conductivity anisotropies. These chords can be used to predict the direction of the largest conductivity for fibrous current collectors

Location
Deutsche Nationalbibliothek Frankfurt am Main
Extent
Online-Ressource
Language
Englisch
Notes
RSC Advances. 4 (2014), 58888-58894, DOI 10.1039/c4ra12402b, issn: 2046-2069
IN COPYRIGHT http://rightsstatements.org/page/InC/1.0 rs

Classification
Biowissenschaften, Biologie
Keyword
Tomografie
Elektrolyse

Event
Veröffentlichung
(where)
Freiburg
(who)
Universität
(when)
2014
Creator
Contributor
Albert-Ludwigs-Universität Freiburg
Technische Fakultät

DOI
10.1039/c4ra12402b
URN
urn:nbn:de:bsz:25-freidok-122237
Rights
Der Zugriff auf das Objekt ist unbeschränkt möglich.
Last update
25.03.2025, 1:57 PM CET

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Associated

Time of origin

  • 2014

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