Photocatalytic activity of aluminum oxide by oxygen vacancy generation using high-pressure torsion straining

K. Edalati; I. Fujita; Shuhei Takechi; Yuki Nakashima; Kazuki Kumano; Hadi Razavi-Khosroshahi; Makoto Arita; Motonori Watanabe; Xavier Sauvage; T. Akbay; Tatsumi Ishihara; Masayoshi Fuji; Z. Horita

doi:10.1016/j.scriptamat.2019.08.011

Photocatalytic activity of aluminum oxide by oxygen vacancy generation using high-pressure torsion straining

K. Edalati, I. Fujita, Shuhei Takechi, Yuki Nakashima, Kazuki Kumano, Hadi Razavi-Khosroshahi, Makoto Arita, Motonori Watanabe, Xavier Sauvage, T. Akbay, Tatsumi Ishihara, Masayoshi Fuji, Z. Horita

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15 Citations (Scopus)

Abstract

Alumina is an insulator oxide with a large abundance in the earth's crust, but it shows no photocatalytic activity due to its large bandgap (9 eV). Based on first-principles calculations, the Al₂O₃ bandgap can be reduced below 3 eV, if large oxygen vacancies are generated. Here, Al₂O₃ with large oxygen vacancy concentrations and ~2.5 eV optical bandgap is produced by severe plastic deformation via the high-pressure torsion (HPT) method. The material exhibits photocatalytic dye degradation with a reasonable rate compared with TiO₂ photocatalysis. This finding introduces a simple but effective approach to produce new nature-friendly photocatalysts even from insulator oxides.

Original language	English
Pages (from-to)	120-124
Number of pages	5
Journal	Scripta Materialia
Volume	173
DOIs	https://doi.org/10.1016/j.scriptamat.2019.08.011
Publication status	Published - Dec 2019

All Science Journal Classification (ASJC) codes

Materials Science(all)
Condensed Matter Physics
Mechanics of Materials
Mechanical Engineering
Metals and Alloys

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10.1016/j.scriptamat.2019.08.011

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Edalati, K., Fujita, I., Takechi, S., Nakashima, Y., Kumano, K., Razavi-Khosroshahi, H., Arita, M., Watanabe, M., Sauvage, X., Akbay, T., Ishihara, T., Fuji, M., & Horita, Z. (2019). Photocatalytic activity of aluminum oxide by oxygen vacancy generation using high-pressure torsion straining. Scripta Materialia, 173, 120-124. https://doi.org/10.1016/j.scriptamat.2019.08.011

Edalati, K, Fujita, I, Takechi, S, Nakashima, Y, Kumano, K, Razavi-Khosroshahi, H, Arita, M , Watanabe, M, Sauvage, X, Akbay, T, Ishihara, T, Fuji, M & Horita, Z 2019, 'Photocatalytic activity of aluminum oxide by oxygen vacancy generation using high-pressure torsion straining', Scripta Materialia, vol. 173, pp. 120-124. https://doi.org/10.1016/j.scriptamat.2019.08.011

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title = "Photocatalytic activity of aluminum oxide by oxygen vacancy generation using high-pressure torsion straining",

abstract = "Alumina is an insulator oxide with a large abundance in the earth's crust, but it shows no photocatalytic activity due to its large bandgap (9 eV). Based on first-principles calculations, the Al2O3 bandgap can be reduced below 3 eV, if large oxygen vacancies are generated. Here, Al2O3 with large oxygen vacancy concentrations and ~2.5 eV optical bandgap is produced by severe plastic deformation via the high-pressure torsion (HPT) method. The material exhibits photocatalytic dye degradation with a reasonable rate compared with TiO2 photocatalysis. This finding introduces a simple but effective approach to produce new nature-friendly photocatalysts even from insulator oxides.",

author = "K. Edalati and I. Fujita and Shuhei Takechi and Yuki Nakashima and Kazuki Kumano and Hadi Razavi-Khosroshahi and Makoto Arita and Motonori Watanabe and Xavier Sauvage and T. Akbay and Tatsumi Ishihara and Masayoshi Fuji and Z. Horita",

note = "Funding Information: This work is supported by Grants-in-Aid from MEXT, Japan (16H04539 & 26220909). The HPT process was conducted in IRC-GSAM at Kyushu University. TEM experiments were conducted on a GENESIS facility, supported by the R{\'e}gion Normandie, France, and by the French National Research Agency (ANR-11-EQPX-0020). Publisher Copyright: {\textcopyright} 2019 Elsevier Ltd",

year = "2019",

month = dec,

doi = "10.1016/j.scriptamat.2019.08.011",

language = "English",

volume = "173",

pages = "120--124",

journal = "Scripta Materialia",

issn = "1359-6462",

publisher = "Elsevier Limited",

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TY - JOUR

T1 - Photocatalytic activity of aluminum oxide by oxygen vacancy generation using high-pressure torsion straining

AU - Edalati, K.

AU - Fujita, I.

AU - Takechi, Shuhei

AU - Nakashima, Yuki

AU - Kumano, Kazuki

AU - Razavi-Khosroshahi, Hadi

AU - Arita, Makoto

AU - Watanabe, Motonori

AU - Sauvage, Xavier

AU - Akbay, T.

AU - Ishihara, Tatsumi

AU - Fuji, Masayoshi

AU - Horita, Z.

N1 - Funding Information: This work is supported by Grants-in-Aid from MEXT, Japan (16H04539 & 26220909). The HPT process was conducted in IRC-GSAM at Kyushu University. TEM experiments were conducted on a GENESIS facility, supported by the Région Normandie, France, and by the French National Research Agency (ANR-11-EQPX-0020). Publisher Copyright: © 2019 Elsevier Ltd

PY - 2019/12

Y1 - 2019/12

N2 - Alumina is an insulator oxide with a large abundance in the earth's crust, but it shows no photocatalytic activity due to its large bandgap (9 eV). Based on first-principles calculations, the Al2O3 bandgap can be reduced below 3 eV, if large oxygen vacancies are generated. Here, Al2O3 with large oxygen vacancy concentrations and ~2.5 eV optical bandgap is produced by severe plastic deformation via the high-pressure torsion (HPT) method. The material exhibits photocatalytic dye degradation with a reasonable rate compared with TiO2 photocatalysis. This finding introduces a simple but effective approach to produce new nature-friendly photocatalysts even from insulator oxides.

AB - Alumina is an insulator oxide with a large abundance in the earth's crust, but it shows no photocatalytic activity due to its large bandgap (9 eV). Based on first-principles calculations, the Al2O3 bandgap can be reduced below 3 eV, if large oxygen vacancies are generated. Here, Al2O3 with large oxygen vacancy concentrations and ~2.5 eV optical bandgap is produced by severe plastic deformation via the high-pressure torsion (HPT) method. The material exhibits photocatalytic dye degradation with a reasonable rate compared with TiO2 photocatalysis. This finding introduces a simple but effective approach to produce new nature-friendly photocatalysts even from insulator oxides.

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SP - 120

EP - 124

JO - Scripta Materialia

JF - Scripta Materialia

SN - 1359-6462

ER -

Photocatalytic activity of aluminum oxide by oxygen vacancy generation using high-pressure torsion straining

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