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.

scholarly journals Effect of La0.6Sr0.4Co0.2Fe0.8O3-δ microstructure on oxygen surface exchange kinetics

2016 ◽  
Vol 288 ◽  
pp. 6-9 ◽  
Author(s):  
Katherine Develos-Bagarinao ◽  
Haruo Kishimoto ◽  
Jeffrey De Vero ◽  
Katsuhiko Yamaji ◽  
Teruhisa Horita
Keyword(s):  
Surface Exchange ◽  
Exchange Kinetics ◽  
Oxygen Surface Exchange ◽  
Oxygen Surface
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