Photocatalytic CO 2 reduction by Cr-substituted Ba 2 (In 2-x Cr x )O 5 ·(H 2 O) δ (0.04 ≤ x ≤ 0.60)

Handle URI:
http://hdl.handle.net/10754/627123
Title:
Photocatalytic CO 2 reduction by Cr-substituted Ba 2 (In 2-x Cr x )O 5 ·(H 2 O) δ (0.04 ≤ x ≤ 0.60)
Authors:
Yoon, Songhak; Gaul, Michael; Sharma, Sitansh; Son, Kwanghyo; Hagemann, Hans; Ziegenbalg, Dirk ( 0000-0001-6104-4953 ) ; Schwingenschlögl, Udo ( 0000-0003-4179-7231 ) ; Widenmeyer, Marc; Weidenkaff, Anke ( 0000-0002-7021-1765 )
Abstract:
Cr-substituted polycrystalline Ba2(In2-xCrx)O5·(H2O)δ powders (0.04 ≤ x ≤ 0.60) were synthesized by solid state reaction to investigate the relation of crystal structure, thermochemical, magnetic, and optical properties. The Cr-substitution results in an unit cell expansion and formation of the higher-symmetric tetragonal phase together with increased oxygen and hydrogen contents. Magnetic property measurements reveal that the diamagnetic pristine Ba2In2O5·(H2O)δ becomes magnetically ordered upon Cr-substitution. By UV–vis spectroscopy a gradual shift of the absorption-edge energy to lower values was observed. Numerical calculations showed that the observed bandgap narrowing was ascribed to the Cr induced states near the Fermi level. The correlation between the changes of crystal chemistry, magnetic, and optical properties of Cr-substituted Ba2(In2-xCrx)O5·(H2O)δ can be explained by the replacement of In by Cr. Consequently, an enhanced photocatalytic CO2 reduction activity was observed with increasing Cr substitution, compatible with the state-of-the-art high surface area TiO2 photocatalyst (P-25).
KAUST Department:
Physical Sciences and Engineering (PSE) Division; King Abdullah University of Science and Technology, (KAUST), Thuwal 23955-6900, Saudi Arabia
Citation:
Yoon S, Gaul M, Sharma S, Son K, Hagemann H, et al. (2018) Photocatalytic CO 2 reduction by Cr-substituted Ba 2 (In 2-x Cr x )O 5 ·(H 2 O) δ (0.04 ≤ x ≤ 0.60). Solid State Sciences. Available: http://dx.doi.org/10.1016/j.solidstatesciences.2018.02.005.
Publisher:
Elsevier BV
Journal:
Solid State Sciences
Issue Date:
9-Feb-2018
DOI:
10.1016/j.solidstatesciences.2018.02.005
Type:
Article
ISSN:
1293-2558
Sponsors:
The authors wish to express their thanks to Mr. Samir Hammoud for chemical analysis and B.Sc. Maximilian Hackner for UV–visible diffuse reflectance measurements. We also acknowledge Dr. Eberhard Goering for his support with MPMS magnetometry and Mr Cedric Schnyder (Natural History Museum of Geneva) for the additional Raman spectroscopy measurements. Dr. Angelika Veziridis is acknowledged for helpful discussions and comments. This work was financially supported by the Vector Stiftung (project number 2015-044) and the Swiss National Science Foundation (project number 200021_169033/1). The research reported in this publication was supported by funding from King Abdullah University of Science and Technology (KAUST).
Additional Links:
http://www.sciencedirect.com/science/article/pii/S1293255817311688
Appears in Collections:
Articles; Physical Sciences and Engineering (PSE) Division

Full metadata record

DC FieldValue Language
dc.contributor.authorYoon, Songhaken
dc.contributor.authorGaul, Michaelen
dc.contributor.authorSharma, Sitanshen
dc.contributor.authorSon, Kwanghyoen
dc.contributor.authorHagemann, Hansen
dc.contributor.authorZiegenbalg, Dirken
dc.contributor.authorSchwingenschlögl, Udoen
dc.contributor.authorWidenmeyer, Marcen
dc.contributor.authorWeidenkaff, Ankeen
dc.date.accessioned2018-02-13T13:43:19Z-
dc.date.available2018-02-13T13:43:19Z-
dc.date.issued2018-02-09en
dc.identifier.citationYoon S, Gaul M, Sharma S, Son K, Hagemann H, et al. (2018) Photocatalytic CO 2 reduction by Cr-substituted Ba 2 (In 2-x Cr x )O 5 ·(H 2 O) δ (0.04 ≤ x ≤ 0.60). Solid State Sciences. Available: http://dx.doi.org/10.1016/j.solidstatesciences.2018.02.005.en
dc.identifier.issn1293-2558en
dc.identifier.doi10.1016/j.solidstatesciences.2018.02.005en
dc.identifier.urihttp://hdl.handle.net/10754/627123-
dc.description.abstractCr-substituted polycrystalline Ba2(In2-xCrx)O5·(H2O)δ powders (0.04 ≤ x ≤ 0.60) were synthesized by solid state reaction to investigate the relation of crystal structure, thermochemical, magnetic, and optical properties. The Cr-substitution results in an unit cell expansion and formation of the higher-symmetric tetragonal phase together with increased oxygen and hydrogen contents. Magnetic property measurements reveal that the diamagnetic pristine Ba2In2O5·(H2O)δ becomes magnetically ordered upon Cr-substitution. By UV–vis spectroscopy a gradual shift of the absorption-edge energy to lower values was observed. Numerical calculations showed that the observed bandgap narrowing was ascribed to the Cr induced states near the Fermi level. The correlation between the changes of crystal chemistry, magnetic, and optical properties of Cr-substituted Ba2(In2-xCrx)O5·(H2O)δ can be explained by the replacement of In by Cr. Consequently, an enhanced photocatalytic CO2 reduction activity was observed with increasing Cr substitution, compatible with the state-of-the-art high surface area TiO2 photocatalyst (P-25).en
dc.description.sponsorshipThe authors wish to express their thanks to Mr. Samir Hammoud for chemical analysis and B.Sc. Maximilian Hackner for UV–visible diffuse reflectance measurements. We also acknowledge Dr. Eberhard Goering for his support with MPMS magnetometry and Mr Cedric Schnyder (Natural History Museum of Geneva) for the additional Raman spectroscopy measurements. Dr. Angelika Veziridis is acknowledged for helpful discussions and comments. This work was financially supported by the Vector Stiftung (project number 2015-044) and the Swiss National Science Foundation (project number 200021_169033/1). The research reported in this publication was supported by funding from King Abdullah University of Science and Technology (KAUST).en
dc.publisherElsevier BVen
dc.relation.urlhttp://www.sciencedirect.com/science/article/pii/S1293255817311688en
dc.rightsNOTICE: this is the author’s version of a work that was accepted for publication in Solid State Sciences. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Solid State Sciences, [, , (2018-02-09)] DOI: 10.1016/j.solidstatesciences.2018.02.005 . © 2018. This manuscript version is made available under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/en
dc.subjectPhotocatalytic CO2 reductionen
dc.subjectBa2In2O5en
dc.subjectDFTen
dc.subjectCr-substitutionen
dc.subjectLe Bail fiten
dc.subjectCrystal chemistryen
dc.subjectMagnetic propertyen
dc.subjectOptical propertyen
dc.titlePhotocatalytic CO 2 reduction by Cr-substituted Ba 2 (In 2-x Cr x )O 5 ·(H 2 O) δ (0.04 ≤ x ≤ 0.60)en
dc.typeArticleen
dc.contributor.departmentPhysical Sciences and Engineering (PSE) Divisionen
dc.contributor.departmentKing Abdullah University of Science and Technology, (KAUST), Thuwal 23955-6900, Saudi Arabiaen
dc.identifier.journalSolid State Sciencesen
dc.eprint.versionPost-printen
dc.contributor.institutionInstitute for Materials Science, University of Stuttgart, Heisenbergstrasse 3, D-70569 Stuttgart, Germanyen
dc.contributor.institutionInstitute of Technical Chemistry, University of Stuttgart, Pfaffenwaldring 55, D-70569 Stuttgart, Germanyen
dc.contributor.institutionDepartment of Modern Magnetic Systems, Max Planck Institute for Intelligent Systems, Heisenbergstrasse 3, D-70569 Stuttgart, Germanyen
dc.contributor.institutionDépartement de Chimie Physique, Université de Genève, 30, quai E. Ansermet, CH-1211 Geneva 4, Switzerlanden
kaust.authorSharma, Sitanshen
kaust.authorSchwingenschlögl, Udoen
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