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dc.contributor.authorBock, Robert
dc.contributor.authorKaroliussen, Håvard
dc.contributor.authorPollet, Bruno
dc.contributor.authorSecanell, Marc
dc.contributor.authorSeland, Frode
dc.contributor.authorStanier, Dave
dc.contributor.authorBurheim, Odne Stokke
dc.identifier.citationInternational journal of hydrogen energy. 2018, .nb_NO
dc.description.abstractAs the proton exchange membrane fuel cell (PEMFC) has improved its performance and power density, the efficiency has remained unchanged. With around half the reaction enthalpy released as heat, thermal gradients grow. To improve the understanding of such gradients, PEMFC component thermal conductivity has been increasingly investigated over the last ten years, and the catalyst layer (CL) is one of the components where thermal conductivity values are still scarce. CLs in PEMFC are where the electrochemical reactions occur and most of the heat is released. The thermal conductivity in this region affects the heat distribution significantly within a PEMFC. Thermal conductivities for a graphitized and a non-graphitized CL were measured for compaction pressures in the range of 3 and 23 bar. The graphitized CL has a thermal conductivity of 0.12 ± 0.05 WK–1m–1, whilst the non-graphitized CL conductivity is 0.061 ± 0.006 WK–1m–1, both at 10 bar compaction pressure. These results suggest that the graphitization of the catalyst material causes a doubling of the thermal conductivity of the CL. This important finding bridges the very few existing studies. Additionally, a 2D thermal model was constructed to represent the impact of the results on the temperature distribution inside a fuel cell.nb_NO
dc.rightsAttribution-NonCommercial-NoDerivatives 4.0 Internasjonal*
dc.titleThe influence of graphitization on the thermal conductivity of catalyst layers and temperature gradients in proton exchange membrane fuel cellsnb_NO
dc.typeJournal articlenb_NO
dc.typePeer reviewednb_NO
dc.source.journalInternational journal of hydrogen energynb_NO
dc.description.localcode© 2018. This is the authors’ accepted and refereed manuscript to the article. Locked until 11.12.2020 due to copyright restrictions. This manuscript version is made available under the CC-BY-NC-ND 4.0 license
cristin.unitnameInstitutt for energi- og prosessteknikk
cristin.unitnameInstitutt for materialteknologi

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Attribution-NonCommercial-NoDerivatives 4.0 Internasjonal
Except where otherwise noted, this item's license is described as Attribution-NonCommercial-NoDerivatives 4.0 Internasjonal