Study of the surface reaction kinetics of (La,Sr)MnO3- oxygen carriers for solar thermochemical fuel production

Cited 8 time in webofscience Cited 0 time in scopus
  • Hit : 210
  • Download : 0
(La,Sr)MnO3- 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- (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 degrees C and pO(2) = 2.9 x 10(-19) to 9.0 x 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 pO(2) near the target temperature of 800 degrees 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.
Publisher
ROYAL SOC CHEMISTRY
Issue Date
2018-07
Language
English
Article Type
Article
Keywords

LANTHANUM MANGANITE PEROVSKITES; LA0.7SR0.3MNO3 THIN-FILMS; ELECTRICAL-CONDUCTIVITY; PHASE-DIAGRAM; CO2; EXCHANGE; CERIA; TRANSPORT; OXIDES; H2O

Citation

JOURNAL OF MATERIALS CHEMISTRY A, v.6, no.27, pp.13082 - 13089

ISSN
2050-7488
DOI
10.1039/c8ta01939h
URI
http://hdl.handle.net/10203/244871
Appears in Collection
MS-Journal Papers(저널논문)
Files in This Item
There are no files associated with this item.
This item is cited by other documents in WoS
⊙ Detail Information in WoSⓡ Click to see webofscience_button
⊙ Cited 8 items in WoS Click to see citing articles in records_button

qr_code

  • mendeley

    citeulike


rss_1.0 rss_2.0 atom_1.0