Measuring oxygen diffusion and oxygen surface exchange by conductivity relaxation

2000 ◽  
Vol 136-137 (1-2) ◽  
pp. 997-1001 ◽  
Author(s):  
J Lane
Keyword(s):  
Oxygen Diffusion ◽  
Conductivity Relaxation ◽  
Surface Exchange ◽  
Oxygen Surface Exchange ◽  
Oxygen Surface

Oxygen Diffusion and Surface Exchange in Yttria-Stabilized Zirconia and Gadolinia-Doped Ceria Ceramics at Low Temperatures

2009 ◽  
Vol 289-292 ◽  
pp. 769-774 ◽  
Author(s):  
Kazimierz Kowalski
Keyword(s):  
Low Temperatures ◽  
Oxygen Diffusion ◽  
Isotopic Labeling ◽  
Yttria Stabilized Zirconia ◽  
Doped Ceria ◽  
Stabilized Zirconia ◽  
Surface Exchange ◽  
Self Diffusion ◽  
Oxygen Surface Exchange ◽  
Oxygen Surface

Oxygen self-diffusion and oxygen surface exchange investigations in the yttria-stabilized zirconia (3 and 8 mol% of Y2O3) and in the gadolinia-doped ceria (10 and 20 mol% of Gd2O3) ceramics in the temperature range from 250 to 450°C were performed by means of the 18O isotopic labeling and the SIMS profiling methods. The activation energies of these processes were determined. The results were discussed in comparison with the literature data extrapolated from higher temperatures.

Measuring oxygen surface exchange kinetics on mixed-conducting composites by electrical conductivity relaxation

2015 ◽  
Vol 3 (19) ◽  
pp. 10296-10302 ◽  
Author(s):  
Bobing Hu ◽  
Yunlong Wang ◽  
Zhuoying Zhu ◽  
Changrong Xia ◽  
Henny J. M. Bouwmeester
Keyword(s):  
Dual Phase ◽  
Conductivity Relaxation ◽  
Surface Exchange ◽  
Electrical Conductivity Relaxation ◽  
Chemical Relaxation ◽  
Relaxation Experiments ◽  
Exchange Kinetics ◽  
Heterogeneous Phase ◽  
Oxygen Surface Exchange ◽  
Oxygen Surface

Chemical relaxation experiments in reducing atmospheres show little to no contribution of heterogeneous phase-boundaries to oxygen surface exchange kinetics on Sr2Fe1.5Mo0.5O6−δ–Sm0.2Ce0.8O2−δ dual-phase composites.

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...

Limits to the rate of oxygen transport in mixed-conducting oxides

2017 ◽  
Vol 5 (38) ◽  
pp. 20334-20350 ◽  
Author(s):  
Roger A. De Souza
Keyword(s):  
Oxygen Transport ◽  
Tracer Diffusion ◽  
Surface Exchange ◽  
Conducting Oxides ◽  
Oxygen Surface Exchange ◽  
Oxygen Tracer ◽  
Oxygen Surface

Chemically reasonable limits to the rates of oxygen tracer diffusion and oxygen surface exchange in acceptor-doped oxides are examined.

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