Oxygen Electrode Kinetics and Surface Composition of Dense (La0.75Sr0.25)0.95MnO3 on YSZ

Yuehua Wu, Karin Vels Hansen, Kion Norrman, Torben Jacobsen, Mogens Bjerg Mogensen

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Abstract

Lanthanum strontium manganate (LSM) micro-electrodes with the nominal composition of (La0.75Sr0.25)0.95MnO3 were deposited on yttria stabilized zirconia (YSZ). The diameter varied from 20 –
100 m and the thickness was kept constant at ca. 0.5 m. Electrochemical characterization was carried out in situ at temperatures from 660 to 860 C using a controlled atmosphere high temperature scanning probe microscope (CAHT-SPM) setup for measurements of impedance spectroscopy and potential sweep. The oxygen partial pressure, pO2, was varied. Further, ex situ surface analysis by time of flight secondary ion mass spectrometry (TOF-SIMS) and structure examination by scanning electron microscopy (SEM) were performed. Segregation of Sr and La oxides to LSM surfaces and Mn rich oxide to the three phase boundary (TPB) was observed. YSZ and LSM attract different oxides/impurities. The oxygen electrode kinetics are discussed in light of the surface compositions and compared with the literature on microelectrode and composite LSM-YSZ electrode kinetics.
Original languageEnglish
JournalE C S Transactions
Volume57
Issue number1
Pages (from-to)1673-1682
ISSN1938-5862
DOIs
Publication statusPublished - 2013
Event13th International Symposium on Solid Oxide Fuel Cells (SOFC-XIII) - Okinawa, Japan
Duration: 6 Oct 201311 Oct 2013
Conference number: 13

Conference

Conference13th International Symposium on Solid Oxide Fuel Cells (SOFC-XIII)
Number13
CountryJapan
CityOkinawa
Period06/10/201311/10/2013

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