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X-ray micro-computed tomography of polymer electrolyte fuel cells: what is the representative elementary area?

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dc.affiliation.dptoUC3M. Departamento de Ingeniería Térmica y de Fluidoses
dc.affiliation.grupoinvUC3M. Grupo de Investigación: Mecánica de Fluidoses
dc.contributor.authorHack, Jennifer
dc.contributor.authorGarcía-Salaberri, Pablo A.
dc.contributor.authorKok, Matthew D. R.
dc.contributor.authorJervis, Rhodri
dc.contributor.authorShearing, Paul R.
dc.contributor.authorBrandon, Nigel
dc.contributor.authorBrett, Dan J. L.
dc.date.accessioned2021-09-29T12:45:17Z
dc.date.available2021-09-29T12:45:17Z
dc.date.issued2020-01-22
dc.description.abstractWith the growing use of X-ray computed tomography (X-ray CT) datasets for modelling of transport properties, comes the need to define the representative elementary volume (REV) if considering three dimensions or the representative elementary area (REA) if considering two dimensions. The resolution used for imaging must be suited to the features of interest in the sample and the region-of-interest must be sufficiently large to capture key information. Polymer electrolyte fuel cells have a hierarchical structure, with materials spanning multiple length scales. The work presented here examines the nature of the REA throughout a 25 cm2 membrane electrode assembly (MEA), focusing specifically on the micron length scale. Studies were carried out to investigate key structural (volume fraction, layer and penetration thickness, pore diameters) and transport (effective diffusivity) properties. Furthermore, the limiting current density of the nine regions was modelled. Stochastic heterogeneity throughout the sample results in local variations throughout. Finally, effects of resolution were probed by imaging using a range of optical magnifications (4× and 20×). The correlated and competing effects of voxel resolution and sampling size were found to cause difficulties where loss of clarity in the boundaries between phases occurs with larger imaging volumes.en
dc.description.sponsorshipJennifer Hack acknowledges a studentship from the EPSRC Centre for Doctoral Training in Advanced Characterisation of Materials (EP/LO15277/1) and the hydrogen and fuel cell research in the Electrochemical Innovation Lab (EIL) is supported through EPSRC projects (EP/M014371/1, EP/S018204/2, EP/R023581/1, EP/P009050/1, EP/L015749/1, EP/M009394/1, EP/M023508/1). Paul R. Shearing acknowledges funding from the Royal Academy of Engineering (CiET1718/59). Pablo A. García-Salaberri thanks the support from the STFC Early Career Award (ST/R006873/1) during his stay at the EIL.en
dc.format.extent12es
dc.identifier.bibliographicCitationJournal of the Electrochemical Society, 167(1), 013545, Jan. 2020, 12 pp.en
dc.identifier.doihttps://doi.org/10.1149/1945-7111/ab6983
dc.identifier.issn0013-4651
dc.identifier.issn1945-7111 (online)
dc.identifier.publicationfirstpage1es
dc.identifier.publicationissue1, 013545es
dc.identifier.publicationlastpage12es
dc.identifier.publicationtitleJOURNAL OF THE ELECTROCHEMICAL SOCIETYen
dc.identifier.publicationvolume167es
dc.identifier.urihttps://hdl.handle.net/10016/33341
dc.identifier.uxxiAR/0000025486
dc.language.isoengen
dc.publisherIOP Sciencees
dc.rights© 2020 The Author(s). Published on behalf of The Electrochemical Society by IOP Publishing Limited.en
dc.rightsThis is an open access article distributed under the terms of the Creative Commons Attribution 4.0 License (CC BY), which permits unrestricted reuse of the work in any medium, provided the original work is properly cited.en
dc.rightsAtribución 3.0 España*
dc.rights.accessRightsopen accessen
dc.rights.urihttp://creativecommons.org/licenses/by/3.0/es/*
dc.subject.ecienciaIngeniería Industriales
dc.subject.otherComputerized tomographyen
dc.subject.otherImage segmentationen
dc.subject.otherPolymethyl methacrylatesen
dc.subject.otherProton exchange membrane fuel cells (PEMFC)en
dc.subject.otherSolid electrolytesen
dc.subject.otherStochastic systemsen
dc.subject.otherX-raysen
dc.titleX-ray micro-computed tomography of polymer electrolyte fuel cells: what is the representative elementary area?en
dc.typeresearch article*
dc.type.hasVersionVoR*
dspace.entity.typePublication
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