001022607 001__ 1022607
001022607 005__ 20240712113147.0
001022607 0247_ $$2datacite_doi$$a10.34734/FZJ-2024-01573
001022607 037__ $$aFZJ-2024-01573
001022607 041__ $$aEnglish
001022607 1001_ $$0P:(DE-Juel1)178966$$aKadyk, Thomas$$b0$$eCorresponding author$$ufzj
001022607 1112_ $$aWorld Fuel Cell Conference 2023$$cLondon$$d2023-12-11 - 2023-12-13$$gWFCC 2023$$wUK
001022607 245__ $$aBridging Microstructure Degradation and Macroscopic Performance Modeling in Polymer Electrolyte Fuel Cell Catalyst Layers
001022607 260__ $$c2023
001022607 3367_ $$033$$2EndNote$$aConference Paper
001022607 3367_ $$2DataCite$$aOther
001022607 3367_ $$2BibTeX$$aINPROCEEDINGS
001022607 3367_ $$2DRIVER$$aconferenceObject
001022607 3367_ $$2ORCID$$aLECTURE_SPEECH
001022607 3367_ $$0PUB:(DE-HGF)6$$2PUB:(DE-HGF)$$aConference Presentation$$bconf$$mconf$$s1707834855_6032$$xAfter Call
001022607 520__ $$aElectrochemical energy devices like fuel cells, electrolyzers or batteries harness porous electrodes with complex heterogeneous microstructures to optimize the interplay between the transport processes and electrochemical reaction. The use of nano-to-microstructured electrodes increases performance as well as catalyst utilization. However, such electrode structures are also more susceptible to degradation and performance decline. Statistical-physical models for microstructure degradation must be interlinked to macrohomogeneous performance models. This talk outlines the challenges in establishing this link, as depicted in Fig. 1, and discusses possible solutions.The catalyst layer of a PEFC is a complex composite electrode of Pt-based catalyst nanoparticles on a carbon substrate, ionically connected by ionomer and water as the active reaction medium. During operation, catalyst nanoparticles undergo changes due to dissolution, re-deposition of dissolved catalyst (i.e., Ostwald ripening), coagulation or inactivation of catalyst particles. The carbon substrate can undergo corrosion and the ionomer can undergo restructuring, which could affect the water retention behavior of the electrode. The changes in catalyst particle properties, especially the particle radius distribution, lead to a decrease of the overall catalyst surface available for the reaction, and thus to a performance decline. At a first glance, the coupling between microstructure and performance could be achieved by using the catalyst surface area as a scaling factor for the exchange current density. However, difficulties arise when incorporating degradation mechanisms that alter structural properties and conditions other than the catalyst particle size. For example, dealloying of catalysts like PtCo or PtNi changes both particles size and materials composition. When deconvoluting both effects in accelerated stress tests on automotive cells, we found that the change in catalyst activity, described by Tafel slope and exchange current density, correlates with the change in active surface area [1]. Changes in the ionomer morphology can lead to altered wetting behavior and liquid water retention, leaving the catalyst layer more prone to flooding [2]. Additionally, proton conductivity changes, but its description needs to take structural features of the ionomer morphology into account [3]. Overall, linking structural degradation effects to device-level performance requires finding and tailoring appropriate descriptors and structure property relationships.References: [1] D. Bernhard, T. Kadyk, S. Kirsch, H. Scholz, U. Krewer. J. Power Sources 562:232771 (2023)[2] W. Olbrich, T. Kadyk, U. Sauter, M. Eikerling. Electrochim. Acta 431:140850 (2022)[3] W. Olbrich, T. Kadyk, U. Sauter, M. Eikerling, J. Gostick. Scientific Reports 13:14127 (2023)Keywords: polymer electrolyte fuel cell, solid oxide cell, catalyst degradation, modelling, voltage loss prediction.
001022607 536__ $$0G:(DE-HGF)POF4-1231$$a1231 - Electrochemistry for Hydrogen (POF4-123)$$cPOF4-123$$fPOF IV$$x0
001022607 7001_ $$0P:(DE-Juel1)180116$$aOlbrich, Wolfgang$$b1
001022607 7001_ $$0P:(DE-HGF)0$$aBernhard, David$$b2
001022607 7001_ $$0P:(DE-HGF)0$$aKirsch, Sebastian$$b3
001022607 7001_ $$0P:(DE-HGF)0$$aKrewer, Ulrike$$b4
001022607 7001_ $$0P:(DE-Juel1)178034$$aEikerling, Michael$$b5$$ufzj
001022607 8564_ $$uhttps://juser.fz-juelich.de/record/1022607/files/Abstract.docx$$yOpenAccess
001022607 909CO $$ooai:juser.fz-juelich.de:1022607$$pdriver$$pVDB$$popen_access$$popenaire
001022607 9101_ $$0I:(DE-588b)5008462-8$$6P:(DE-Juel1)178966$$aForschungszentrum Jülich$$b0$$kFZJ
001022607 9101_ $$0I:(DE-588b)5008462-8$$6P:(DE-Juel1)178034$$aForschungszentrum Jülich$$b5$$kFZJ
001022607 9131_ $$0G:(DE-HGF)POF4-123$$1G:(DE-HGF)POF4-120$$2G:(DE-HGF)POF4-100$$3G:(DE-HGF)POF4$$4G:(DE-HGF)POF$$9G:(DE-HGF)POF4-1231$$aDE-HGF$$bForschungsbereich Energie$$lMaterialien und Technologien für die Energiewende (MTET)$$vChemische Energieträger$$x0
001022607 9141_ $$y2023
001022607 915__ $$0StatID:(DE-HGF)0510$$2StatID$$aOpenAccess
001022607 9201_ $$0I:(DE-Juel1)IEK-13-20190226$$kIEK-13$$lIEK-13$$x0
001022607 9801_ $$aFullTexts
001022607 980__ $$aconf
001022607 980__ $$aVDB
001022607 980__ $$aUNRESTRICTED
001022607 980__ $$aI:(DE-Juel1)IEK-13-20190226
001022607 981__ $$aI:(DE-Juel1)IET-3-20190226