Photocatalytic CO2 reduction by Cr-substituted Ba2 (In2-xCrx)O5·(H2O)δ (0.04 ≤ x ≤ 0.60)

Songhak Yoon; Michael Gaul; Sitansh Sharma; Kwanghyo Son; Hans Hagemann; Dirk Ziegenbalg; Udo Schwingenschlögl; Marc Widenmeyer; Anke Weidenkaff

doi:10.1016/j.solidstatesciences.2018.02.005

Photocatalytic CO2 reduction by Cr-substituted Ba2 (In2-xCrx)O5·(H2O)δ (0.04 ≤ x ≤ 0.60)

Songhak Yoon, Michael Gaul, Sitansh Sharma, Kwanghyo Son, Hans Hagemann, Dirk Ziegenbalg, Udo Schwingenschlögl, Marc Widenmeyer, Anke Weidenkaff

Research output: Contribution to journal › Article › peer-review

5 Scopus citations

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).

Original language	English (US)
Pages (from-to)	22-29
Number of pages	8
Journal	Solid State Sciences
Volume	78
DOIs	https://doi.org/10.1016/j.solidstatesciences.2018.02.005
State	Published - Feb 9 2018

Bibliographical note

KAUST Repository Item: Exported on 2020-10-01
Acknowledgements: 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).

Access to Document

10.1016/j.solidstatesciences.2018.02.005

https://repository.kaust.edu.sa/bitstream/10754/627123/1/1-s2.0-S1293255817311688-main.pdf

Cite this

@article{237dac4766874a7283969ee305b16ae1,

title = "Photocatalytic CO2 reduction by Cr-substituted Ba2 (In2-xCrx)O5·(H2O)δ (0.04 ≤ x ≤ 0.60)",

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).",

author = "Songhak Yoon and Michael Gaul and Sitansh Sharma and Kwanghyo Son and Hans Hagemann and Dirk Ziegenbalg and Udo Schwingenschl{\"o}gl and Marc Widenmeyer and Anke Weidenkaff",

note = "KAUST Repository Item: Exported on 2020-10-01 Acknowledgements: 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).",

year = "2018",

month = feb,

day = "9",

doi = "10.1016/j.solidstatesciences.2018.02.005",

language = "English (US)",

volume = "78",

pages = "22--29",

journal = "Solid State Sciences",

issn = "1293-2558",

publisher = "Elsevier Masson SAS",

}

TY - JOUR

T1 - Photocatalytic CO2 reduction by Cr-substituted Ba2 (In2-xCrx)O5·(H2O)δ (0.04 ≤ x ≤ 0.60)

AU - Yoon, Songhak

AU - Gaul, Michael

AU - Sharma, Sitansh

AU - Son, Kwanghyo

AU - Hagemann, Hans

AU - Ziegenbalg, Dirk

AU - Schwingenschlögl, Udo

AU - Widenmeyer, Marc

AU - Weidenkaff, Anke

N1 - KAUST Repository Item: Exported on 2020-10-01 Acknowledgements: 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).

PY - 2018/2/9

Y1 - 2018/2/9

N2 - 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).

AB - 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).

UR - http://hdl.handle.net/10754/627123

UR - http://www.sciencedirect.com/science/article/pii/S1293255817311688

UR - http://www.scopus.com/inward/record.url?scp=85042025490&partnerID=8YFLogxK

U2 - 10.1016/j.solidstatesciences.2018.02.005

DO - 10.1016/j.solidstatesciences.2018.02.005

M3 - Article

SN - 1293-2558

VL - 78

SP - 22

EP - 29

JO - Solid State Sciences

JF - Solid State Sciences

ER -

Photocatalytic CO2 reduction by Cr-substituted Ba2 (In2-xCrx)O5·(H2O)δ (0.04 ≤ x ≤ 0.60)

Abstract

Bibliographical note

Access to Document

Other files and links

Fingerprint

Cite this