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The effect of water vapor on surface oxygen exchange kinetics of thin film (La,Sr)(Co,Fe)O3-δ
- Source :
- Journal of Power Sources. 451:227478
- Publication Year :
- 2020
- Publisher :
- Elsevier BV, 2020.
-
Abstract
- Oxygen reduction and transport in electrochemical applications are strongly affected by the reactant gas composition, including impurities such as water. Understanding the relationship between oxygen reactivity and humidity is key for attaining stability and high efficiency of solid oxide fuel cells, which are especially attractive for transportation applications as low emission power generation devices. Both short- and long-term effects of moisture have previously been associated with use of ambient air. To better understand these effects, we study oxygen exchange kinetics at the cathode surface and the cathode/electrolyte interface using La0.6Sr0.4Co0.2Fe0.8O3-δ (LSCF) epitaxial thin films as a model-surface system. In situ synchrotron X-ray techniques evaluate the oxygen reduction reaction (ORR) kinetics in response to environmental variables. The results suggest a clear enhancement of the ORR rate upon short term exposure of the perovskite-structured films to water. On the basis of these measurements, along with in situ X-ray characterization of Sr segregation and computational first-principles studies, we suggest a model for this increased ORR activity that may lead to further improvements by stabilizing active cathode surface configurations.
- Subjects :
- Materials science
Renewable Energy, Sustainability and the Environment
Oxide
Energy Engineering and Power Technology
chemistry.chemical_element
02 engineering and technology
Electrolyte
010402 general chemistry
021001 nanoscience & nanotechnology
Electrochemistry
01 natural sciences
Oxygen
Cathode
0104 chemical sciences
law.invention
chemistry.chemical_compound
chemistry
Chemical engineering
law
Solid oxide fuel cell
Electrical and Electronic Engineering
Physical and Theoretical Chemistry
Thin film
0210 nano-technology
Water vapor
Subjects
Details
- ISSN :
- 03787753
- Volume :
- 451
- Database :
- OpenAIRE
- Journal :
- Journal of Power Sources
- Accession number :
- edsair.doi...........1efee04ad479927d3e6fea9b421ff534