Energy conversion materials exhibit complex dynamic behavior when subjected to elevated temperatures and polarization.</p

Hansen, Karin Vels

Jacobsen, Torben

Norrman, Kion

Kion Norrman

Karin Vels Hansen

Torben Jacobsen

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RSC Advances

Dynamic behavior of impurities and native components in model LSM microelectrodes on YSZ

Strontium-doped lanthanum manganite is a widely used cathode material in solid oxide fuel cells. Segregation phenomena can have a critical impact on performance and durability, especially when they cause active interfaces to degrade. The segregation behavior in polarized and non-polarized strontium-doped lanthanum manganite ((La0.75Sr0.25)0.95MnO3) microelectrodes with a diameter of 100 μm and a thickness of ∼500 nm on an yttria-stabilized zirconia electrolyte were analyzed post-mortem after ∼200 h at temperatures up to 850 °C. Time-of-flight secondary ion mass spectrometry was used to study the dynamic behavior of the native components (La, Sr, Mn) and selected impurities (Si, K, Na) both laterally and in-depth. Manganese was found to be especially mobile and showed both segregation onto the electrolyte as a result of temperature and polarization and dissolution into the electrolyte below the microelectrodes. All native components showed a complex in-depth dynamic behavior, and a nanoscale in-depth analysis of the electrode-electrolyte interface revealed the formation of a well-defined lanthanum zirconate layer. The selected impurities segregated to the electrolyte and microelectrode surfaces and Na- and K-rich layers formed at different depths

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Dynamic behavior of impurities and native components in model LSM microelectrodes onYSZ - DTU Orbit (08/11/2017) Dynamic behavior of impurities and native components in model LSM microelectrodes on YSZStrontium-doped lanthanum manganite is a widely used cathode material in solid oxide fuel cells. Segregation phenomenacan have a critical impact on performance and durability, especially when they cause active interfaces to degrade. Thesegregation behavior in polarized and non-polarized strontium-doped lanthanum manganite ((La0.75Sr0.25)0.95MnO3)microelectrodes with a diameter of 100 μm and a thickness of ∼500 nm on an yttria-stabilized zirconia electrolyte wereanalyzed post-mortem after ∼200 h at temperatures up to 850 °C. Time-of-flight secondary ion mass spectrometry wasused to study the dynamic behavior of the native components (La, Sr, Mn) and selected impurities (Si, K, Na) both laterallyand in-depth. Manganese was found to be especially mobile and showed both segregation onto the electrolyte as a resultof temperature and polarization and dissolution into the electrolyte below the microelectrodes. All native componentsshowed a complex in-depth dynamic behavior, and a nanoscale in-depth analysis of the electrode-electrolyte interfacerevealed the formation of a well-defined lanthanum zirconate layer. The selected impurities segregated to the electrolyteand microelectrode surfaces and Na- and K-rich layers formed at different depths. General informationState: PublishedOrganisations: Department of Energy Conversion and Storage, Imaging and Structural Analysis, Department of ChemistryAuthors: Norrman, K. (Intern), Hansen, K. V. (Intern), Jacobsen, T. (Intern)Number of pages: 15Pages: 87679-87693Publication date: 2015Main Research Area: Technical/natural sciences Publication informationJournal: R S C AdvancesVolume: 5Issue number: 106ISSN (Print): 2046-2069Ratings: BFI (2017): BFI-level 1 Web of Science (2017): Indexed yes BFI (2016): BFI-level 1 Scopus rating (2016): CiteScore 3.06 SJR 0.875 SNIP 0.743 Web of Science (2016): Indexed yes BFI (2015): BFI-level 1 Scopus rating (2015): SJR 0.959 SNIP 0.837 CiteScore 3.42 Web of Science (2015): Indexed yes BFI (2014): BFI-level 1 Scopus rating (2014): SJR 1.114 SNIP 0.965 CiteScore 3.87 Web of Science (2014): Indexed yes BFI (2013): BFI-level 1 Scopus rating (2013): SJR 1.117 SNIP 0.903 CiteScore 3.74 ISI indexed (2013): ISI indexed yes Web of Science (2013): Indexed yes Scopus rating (2012): SJR 0.863 SNIP 0.603 CiteScore 2.4 ISI indexed (2012): ISI indexed no Web of Science (2012): Indexed yes Original language: EnglishChemical Engineering (all), Chemistry (all), Cathodes, Electrodes, Electrolytes, Fuel cells, Lanthanum, Lanthanumcompounds, Lanthanum oxides, Manganese, Manganese oxide, Manganites, Mass spectrometry, Microelectrodes,Secondary ion mass spectrometry, Segregation (metallography), Solid electrolytes, Solid oxide fuel cells (SOFC),Strontium, Zirconia, Cath-ode materials, Electrode-electrolyte interfaces, Lanthanum zirconate, Microelectrode surfaces,Segregation phenomena, Strontium doped lanthanum manganites, Time of flight secondary ion mass spectrometry, Yttriastabilized zirconia electrolyte, Yttria stabilized zirconiaDOIs: 10.1039/c5ra18042b Source: FindItSource-ID: 2286944010Publication: Research - peer-review › Journal article – Annual report year: 2015 

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Dynamic behavior of impurities and native components in model LSM microelectrodes on YSZ

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