Journal article · Conference paper
Oxygen Electrode Kinetics and Surface Composition of Dense (La0.75Sr0.25)0.95MnO3 on YSZ
Department of Energy Conversion and Storage, Technical University of Denmark1
Imaging and Structural Analysis, Department of Energy Conversion and Storage, Technical University of Denmark2
Fundamental Electrochemistry, Department of Energy Conversion and Storage, Technical University of Denmark3
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.
| Language: | English |
|---|---|
| Year: | 2013 |
| Pages: | 1673-1682 |
| Proceedings: | 13th International Symposium on Solid Oxide Fuel Cells (SOFC-XIII) |
| ISSN: | 19386737 and 19385862 |
| Types: | Journal article and Conference paper |
| DOI: | 10.1149/05701.1673ecst |
| ORCIDs: | Hansen, Karin Vels , Norrman, Kion and Mogensen, Mogens Bjerg |
