In situ X-ray Studies of (La,Sr)MnO3_δ, (La,Sr)CoO3_δ, and La0.6Sr0.4Co0.2Fe0.8O3-δ Thin Film SOFC Cathodes Grown by Pulse Laser Deposition

2013 ◽  
Vol 1495 ◽  
Author(s):  
Kee-Chul Chang ◽  
Brian Ingram ◽  
Paul Salvador ◽  
Bilge Yildiz ◽  
Hoydoo You
Keyword(s):  
Thin Film ◽  
Solid Oxide Fuel Cells ◽  
Pulse Laser Deposition ◽  
Pulse Laser ◽  
Solid Oxide ◽  
Laser Deposition ◽  
Pulse Laser Deposition Technique ◽  
Oxide Fuel ◽  
X Ray

ABSTRACTWe will briefly review in situ synchrotron x-ray investigation of model thin film cathode systems for solid oxide fuel cells. The film cathodes examined in this study are (La,Sr)MnO3_δ (LSM), (La,Sr)CoO3_δ (LSC), and La0.6Sr0.4Co0.2Fe0.8O3-δ (LSCF) thin films epitaxially grown on YSZ single crystal substrates by the pulse laser deposition technique. We find in all cases that Sr is enriched or segregated to the surface of the film cathodes. We concluded that the Sr enrichments or segregations are mainly the results of annealing because they do not depend on whether the cathodes are electrochemically biased or not during annealing. However, at least in the case of LSCF, we find that B-site Co segregates rather uniformly to the surface and the segregation responds sensitively and reversibly to the electrochemical bias.

Pulsed laser deposition of Y-doped BaZrO 3 thin film as electrolyte for low temperature solid oxide fuel cells

CIRP Annals ◽  
2013 ◽  
Vol 62 (1) ◽  
pp. 563-566 ◽  
Author(s):  
Joonho Park ◽  
Jun Yeol Paek ◽  
Ikwhang Chang ◽  
Sanghoon Ji ◽  
Suk Won Cha ◽  
...  
Keyword(s):  
Thin Film ◽  
Fuel Cells ◽  
Low Temperature ◽  
Solid Oxide Fuel Cells ◽  
Pulsed Laser Deposition ◽  
Pulsed Laser ◽  
Solid Oxide ◽  
Laser Deposition ◽  
Oxide Fuel

scholarly journals Estimation of micro-size defects in electrolyte thin-film by X-ray stress measurement for anode-supported solid oxide fuel cells

2016 ◽  
Vol 3 (6) ◽  
pp. 16-00177-16-00177 ◽  
Author(s):  
Hirofumi SUMI ◽  
Hiroyuki SHIMADA ◽  
Kazuhisa SATO ◽  
Toshiyuki HASHIDA
Keyword(s):  
Thin Film ◽  
Fuel Cells ◽  
Solid Oxide Fuel Cells ◽  
Stress Measurement ◽  
Solid Oxide ◽  
Oxide Fuel ◽  
X Ray

scholarly journals X-ray Absorption under Operating Conditions for Solid-Oxide Fuel Cells Electrocatalysts: The Case of LSCF/YSZ

Surfaces ◽  
2019 ◽  
Vol 2 (1) ◽  
pp. 32-40 ◽  
Author(s):  
Francesco Giannici ◽  
Giuliano Gregori ◽  
Alessandro Longo ◽  
Alessandro Chiara ◽  
Joachim Maier ◽  
...  
Keyword(s):  
Fuel Cells ◽  
Solid Oxide Fuel Cells ◽  
Operating Conditions ◽  
Solid Oxide ◽  
Oxide Fuel ◽  
X Ray ◽  
High Temperature Materials ◽  
X Ray Absorption ◽  
Electrical Bias

We describe a novel electrochemical cell for X-ray absorption spectroscopy (XAS) experiments during electrical polarization suitable for high-temperature materials such as those used in solid oxide fuel cells. A half-cell LSCF/YSZ was then investigated under cathodic and anodic conditions (850 °C and applied electrical bias ranging from +1 V to −1 V in air). The in situ XAS measurements allowed us to follow the LSCF degradation into simple oxides. The rapid deterioration of LSCF is ascribed to the formation of excess of oxygen vacancies leading to the collapse of the mixed perovskite structure.

Comparative studies on BaZrxTi1-xO3 thin films deposited by Sol-gel and Pulse laser deposition

2003 ◽  
Vol 784 ◽  
Author(s):  
A. Dixit ◽  
P. Bhattacharaya ◽  
S. B. Majumder ◽  
R. S. Katiyar ◽  
A. S. Bhalla
Keyword(s):  
Thin Films ◽  
Pulse Laser Deposition ◽  
Pulse Laser ◽  
Sol Gel ◽  
Laser Deposition ◽  
Pulse Laser Deposition Technique ◽  
X Ray Diffraction ◽  
X Ray ◽  
Si Substrates ◽  
Capacitance Voltage

ABSTRACTFerroelectric thin films of BaZrxTi1-xO3 (BZT) were deposited on platinum (Pt) and platinized silicon (Pt/Si) substrates by sol-gel and pulse laser deposition technique respectively. The structure and preferred orientation of the films were examined by x-ray diffraction measurements. The phase formation of sol-gel derived BZT films were found to be at high temperature (1100°C) compare to the pulse laser deposited BZT films ∼ 700°C. Polycrystalline films were observed by both techniques. Ferroelectric nature of the films was confirmed by hysteresis and capacitance-voltage characteristics using platinum top electrodes. Dielectric constant as well as loss was found to decrease by increasing Zr contents. Surface morphology predicted smooth crack free surface.

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