Oxygen surface exchange properties and surface segregation behavior of nanostructured La0.6Sr0.4Co0.2Fe0.8O3−δ thin film cathodes

2019 ◽  
Vol 21 (13) ◽  
pp. 7183-7195 ◽  
Author(s):  
K. Develos-Bagarinao ◽  
J. De Vero ◽  
H. Kishimoto ◽  
T. Ishiyama ◽  
K. Yamaji ◽  
...  
Keyword(s):  
Thin Film ◽  
Thin Films ◽  
Surface Segregation ◽  
Oxygen Exchange ◽  
Surface Exchange ◽  
Segregation Behavior ◽  
Oxygen Surface Exchange ◽  
Exchange Properties ◽  
Oxygen Surface

Nanostructured LSCF thin films with more enhanced oxygen exchange properties also show a higher tendency to surface segregation.

scholarly journals Surface chemistry of La0.6Sr0.4CoO3−δ thin films and its impact on the oxygen surface exchange resistance

2015 ◽  
Vol 3 (45) ◽  
pp. 22759-22769 ◽  
Author(s):  
Ghislain M. Rupp ◽  
Helena Téllez ◽  
John Druce ◽  
Andreas Limbeck ◽  
Tatsumi Ishihara ◽  
...  
Keyword(s):  
Thin Films ◽  
Surface Chemistry ◽  
Oxygen Exchange ◽  
Surface Exchange ◽  
Icp Ms ◽  
Exchange Kinetics ◽  
Oxygen Surface Exchange ◽  
Oxygen Surface

Correlation between the surface chemistry of LSC thin films analyzed by LEIS and ICP-MS and the oxygen exchange kinetics.

scholarly journals Influence of Heterointerfaces on the Kinetics of Oxygen Surface Exchange on Epitaxial La1.85Sr0.15CuO4 Thin Films

2021 ◽  
Vol 11 (9) ◽  
pp. 3778
Author(s):  
Gene Yang ◽  
So-Yeun Kim ◽  
Changhee Sohn ◽  
Jong K. Keum ◽  
Dongkyu Lee
Keyword(s):  
Thin Films ◽  
Oxygen Vacancies ◽  
Elevated Temperatures ◽  
Surface Exchange ◽  
Electrical Conductivity Relaxation ◽  
Exchange Kinetics ◽  
Relaxation Curves ◽  
Kinetics Of ◽  
Oxygen Surface Exchange ◽  
Oxygen Surface

Considerable attention has been directed to understanding the influence of heterointerfaces between Ruddlesden–Popper (RP) phases and ABO3 perovskites on the kinetics of oxygen electrocatalysis at elevated temperatures. Here, we report the effect of heterointerfaces on the oxygen surface exchange kinetics by employing heteroepitaxial oxide thin films formed by decorating LaNiO3 (LNO) on La1.85Sr0.15CuO4 (LSCO) thin films. Regardless of LNO decoration, tensile in-plane strain on LSCO films does not change. The oxygen surface exchange coefficients (kchem) of LSCO films extracted from electrical conductivity relaxation curves significantly increase with partial decorations of LNO, whereas full LNO coverage leads to the reduction in the kchem of LSCO films. The activation energy for oxygen exchange in LSCO films significantly decreases with partial LNO decorations in contrast with the full coverage of LNO. Optical spectroscopy reveals the increased oxygen vacancies in the partially covered LSCO films relative to the undecorated LSCO film. We attribute the enhanced oxygen surface exchange kinetics of LSCO to the increased oxygen vacancies by creating the heterointerface between LSCO and LNO.

Surface potentials and oxygen surface exchange coefficients of acceptor and donor-doped CeO2 thin films

2021 ◽  
Author(s):  
Hans F. Wardenga ◽  
Katharina N.S. Schuldt ◽  
Stephan Peter Waldow ◽  
Roger A De Souza ◽  
Andreas Klein
Keyword(s):  
Thin Films ◽  
Work Function ◽  
Surface Electron ◽  
Surface Exchange ◽  
Surface Potentials ◽  
Doped Ceo2 ◽  
Oxygen Surface Exchange ◽  
Oxygen Surface

In order to evaluate the influence of work function and surface electron concentrations on oxygen surface exchange coefficients, the surface potentials of acceptor-, donor-, and nominally un-doped CeO2 films are...

A Study of the Oxygen Surface Exchange Coefficient on La0.5Sr0.5CoO3−δ Thin Films

1999 ◽  
Vol 606 ◽  
Author(s):  
X. Chen ◽  
S. Wang ◽  
Y.L. Yang ◽  
L. Smith ◽  
N.J. Wu ◽  
...  
Keyword(s):  
Thin Film ◽  
Thin Films ◽  
Initial Pressure ◽  
Transient Behavior ◽  
Epitaxial Thin Films ◽  
Exchange Coefficient ◽  
Surface Exchange ◽  
Surface Exchange Coefficient ◽  
Pressure Changes ◽  
Oxygen Surface Exchange

AbstractLa0.5Sr0.5CoO3−δ (LSCO) can be used as a cathode material for low temperature solid oxide fuel cell applications. LSCO epitaxial thin films have been deposited on LaAlO3 substrates by pulsed laser deposition (PLD). The transient behavior of the thin film conductivity with the pressure changes was recorded as a function of temperature and partial oxygen pressure. The surface exchange coefficient k of the LSCO thin film was obtained from analysis of the electrical conductivity relaxation data. The measured surface exchange coefficient increases with temperature and with final pressure but is not sensitive to the initial pressure. After prolonged annealing at 900°C, the k value was found to have greatly increased. The mechanism of the dependence of the measured k on pressure is discussed.

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