scholarly journals Rate-Determining Steps of Oxygen Surface Exchange Kinetics on Sr2Fe1.5Mo0.5O6−δ

Energies ◽  
2020 ◽  
Vol 13 (1) ◽  
pp. 250 ◽  
Author(s):  
Denis A. Osinkin ◽  
Anna V. Khodimchuk ◽  
Natalia M. Porotnikova ◽  
Nina M. Bogdanovich ◽  
Andrey V. Fetisov ◽  
...  
Keyword(s):  
Oxygen Diffusion ◽  
Oxygen Adsorption ◽  
Dissociative Adsorption ◽  
Lanthanum Strontium Manganite ◽  
Surface Kinetics ◽  
Exchange Method ◽  
Surface Exchange ◽  
Concentration Dependences ◽  
Kinetics Of ◽  
Oxygen Surface

The oxygen surface kinetics of Sr2Fe1.5Mo0.5O6−δ was determined using the 16O2/18O2 isotope exchange method with gas phase analysis at 600–800 °C. The heterogeneous exchange rates (rH) and the oxygen diffusion coefficients (D) were calculated by processing the concentration dependences of the 18O fraction using Ezin’s model. The rates of oxygen dissociative adsorption (ra) and incorporation (ri) were calculated based on a model using the three exchange type rates. It has been established that the rates ra and ri were comparable in this temperature range. Assumptions were made about the effect of the chemical composition of the surface on the rate of oxygen adsorption. It was found that the oxygen exchange coefficient (k) of Sr2Fe1.5Mo0.5O6−δ is comparable to that of La0.6Sr0.4MnO3±δ oxide. High values of the oxygen diffusion coefficient were found for Sr2Fe1.5Mo0.5O6−δ. The values were comparable to those of the double cobaltite praseodymium-barium and exceed by more than an order those of lanthanum-strontium manganite.

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.

Oxygen surface exchange kinetics of Ba0.5Sr0.5Co0.8Fe0.2O3−δ

2020 ◽  
Vol 22 (18) ◽  
pp. 10158-10169
Author(s):  
V. A. Eremin ◽  
M. V. Ananyev ◽  
H. J. M. Bouwmeester ◽  
E. Kh. Kurumchin ◽  
Ch.-Y. Yoo
Keyword(s):  
Gas Phase ◽  
Oxygen Exchange ◽  
Oxide Surface ◽  
Surface Exchange ◽  
Exchange Kinetics ◽  
Kinetics Of ◽  
Oxygen Surface Exchange ◽  
Oxygen Surface

The mechanism of oxygen exchange between the gas phase and Ba0.5Sr0.5Co0.8Fe0.2O3−δ oxide was evaluated by considering the inhomogeneity of the oxide surface.

Influence of ionic conductivity of the nano-particulate coating phase on oxygen surface exchange of La0.58Sr0.4Co0.2Fe0.8O3−δ

2017 ◽  
Vol 5 (10) ◽  
pp. 4991-4999 ◽  
Author(s):  
Saim Saher ◽  
Sahir Naqash ◽  
Bernard A. Boukamp ◽  
Bobing Hu ◽  
Changrong Xia ◽  
...  
Keyword(s):  
Ionic Conductivity ◽  
Surface Exchange ◽  
Conducting Oxides ◽  
Surface Decoration ◽  
Exchange Kinetics ◽  
Kinetics Of ◽  
Oxygen Surface Exchange ◽  
Oxygen Surface ◽  
Particulate Coating

Surface decoration with nano-particulate oxides is one of the options to improve the surface exchange kinetics of mixed ionic-electronic conducting oxides.

scholarly journals Kinetics of Oxygen Surface Exchange on Epitaxial Ruddlesden–Popper Phases and Correlations to First-Principles Descriptors

2016 ◽  
Vol 7 (2) ◽  
pp. 244-249 ◽  
Author(s):  
Yueh-Lin Lee ◽  
Dongkyu Lee ◽  
Xiao Renshaw Wang ◽  
Ho Nyung Lee ◽  
Dane Morgan ◽  
...  
Keyword(s):  
First Principles ◽  
Surface Exchange ◽  
Kinetics Of ◽  
Oxygen Surface Exchange ◽  
Oxygen Surface

Investigating Oxygen Surface Exchange Kinetics of La0.8Sr.20MnO3 and La0.6Sr0.4Co0.2Fe0.8O3-δ Using an Isotopic Tracer

2019 ◽  
Vol 11 (33) ◽  
pp. 19-36
Author(s):  
Cynthia C. Kan ◽  
Heywood H. Kan ◽  
F. Martin Van Assche ◽  
Eric N. Armstrong ◽  
E. D. Wachsman
Keyword(s):  
Surface Exchange ◽  
Isotopic Tracer ◽  
Exchange Kinetics ◽  
Kinetics Of ◽  
Oxygen Surface Exchange ◽  
Oxygen Surface

Oxygen Surface Exchange Kinetics of Pr2(Ni,Co)O4+δ Thin-Film Model Electrodes

2019 ◽  
Vol 166 (14) ◽  
pp. F1088-F1095 ◽  
Author(s):  
Christian Berger ◽  
Andreas Egger ◽  
Rotraut Merkle ◽  
Edith Bucher ◽  
Benjamin Stuhlhofer ◽  
...  
Keyword(s):  
Thin Film ◽  
Surface Exchange ◽  
Film Model ◽  
Thin Film Model ◽  
Exchange Kinetics ◽  
Kinetics Of ◽  
Oxygen Surface Exchange ◽  
Oxygen Surface
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