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Study of the surface reaction kinetics of (La,Sr)MnO3−δ oxygen carriers for solar thermochemical fuel production
- Source :
- Journal of Materials Chemistry A. 6:13082-13089
- Publication Year :
- 2018
- Publisher :
- Royal Society of Chemistry (RSC), 2018.
-
Abstract
- (La,Sr)MnO3−δ has received a great deal of attention as an oxygen carrier that can replace the state-of-the-art carrier CeO2 for solar-driven thermochemical fuel production. Despite the many relevant studies, however, the redox reaction kinetics of this material, which determines the fuel production rate, has rarely been reported. Here, we investigate the surface reaction rate of reduced Sr-doped lanthanum manganite thin films, as a model for a gas/solid interface of a perovskite-structured oxygen carrier under a condition, in which carbon monoxide is produced from CO2 in a two-step thermochemical cycling process. Thin films of La1−xSrxMnO3−δ (x = 0.1, 0.2, 0.3, 0.4) with dense and flat surfaces are fabricated via pulsed laser deposition, and their surface oxygen exchange rates are then characterized via electrical conductivity relaxation under actual operating conditions (T = 650 to 800 °C and pO2 = 2.9 × 10−19 to 9.0 × 10−13 atm). As the Sr content increases, the oxygen exchange greatly decelerates. On the other hand, for a given Sr content, the oxygen exchange does not vary much over a wide range of pO2 near the target temperature of 800 °C. We also observe the surface oxygen exchange rate has a direct impact on the CO production rate. These observations can guide the selection of an ideal oxygen carrier composition for high-performance fuel production.
- Subjects :
- Materials science
Renewable Energy, Sustainability and the Environment
Kinetics
chemistry.chemical_element
02 engineering and technology
General Chemistry
010402 general chemistry
021001 nanoscience & nanotechnology
01 natural sciences
Oxygen
Redox
0104 chemical sciences
Pulsed laser deposition
chemistry.chemical_compound
chemistry
Lanthanum manganite
Chemical engineering
Electrical resistivity and conductivity
General Materials Science
Thin film
0210 nano-technology
Carbon monoxide
Subjects
Details
- ISSN :
- 20507496 and 20507488
- Volume :
- 6
- Database :
- OpenAIRE
- Journal :
- Journal of Materials Chemistry A
- Accession number :
- edsair.doi...........ff4a875ac4204b1da491bfe00aa24890
- Full Text :
- https://doi.org/10.1039/c8ta01939h