Crystal Structure Determination of Brownmillerite-type BaIn2-xCrxO5.(H2O)y Oxygen Transport Membranes and Photocatalysts
Brownmillerite-type Ba2In2O5 is a well-known mixed ionic electronic conductor material with yellow color (EG ~2.9 eV). Due to the high affinity to water incorporation fast proton conduction is observed below ~600 K. Considering the Brownmillerite structure as defect-perovskite structure with an intrinsically large number of oxygen vacancies a promising oxide ion transport ability of the material is implied. Additionally, the material is found to be suitable for photocatalytic CO2 splitting due to proper active sites (which are currently not clearly identified) and band positions. The conversion efficiency is still low mainly due to the rather large band gap. The band gap can be reduced by partial substitution of In by Cr, hence boosting the CO2 conversion. This substitution causes additional structural changes leading to a high degree of disorder of the oxygen vacancies increasing the oxygen permeation by nearly 40 % compared to pristine Ba2In2O5. Open questions remain regarding the correct assignment of space groups and the nature of the anionic sublattice.
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WIDENMEYER Marc; FINGER Raphael; GOETZE André; Thomas C. Hansen; KEILHOLZ Simon; Holger Kohlmann; SAVVIN Stanislav; WEIDENKAFF Anke and Songhak Yoon. (2020). Crystal Structure Determination of Brownmillerite-type BaIn2-xCrxO5.(H2O)y Oxygen Transport Membranes and Photocatalysts. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.5-24-640
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