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; Taner Akbay; Tatsumi Ishihara; Masayoshi Fuji; Zenji 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, Taner Akbay, Tatsumi Ishihara, Masayoshi Fuji, Zenji Horita

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

9 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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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

Photocatalytic activity of aluminum oxide by oxygen vacancy generation using high-pressure torsion straining. / Edalati, K.; Fujita, I.; Takechi, Shuhei; Nakashima, Yuki; Kumano, Kazuki; Razavi-Khosroshahi, Hadi; Arita, Makoto ; Watanabe, Motonori; Sauvage, Xavier; Akbay, Taner; Ishihara, Tatsumi; Fuji, Masayoshi; Horita, Zenji.

In: Scripta Materialia, Vol. 173, 12.2019, p. 120-124.

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

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

Edalati, K. ; Fujita, I. ; Takechi, Shuhei ; Nakashima, Yuki ; Kumano, Kazuki ; Razavi-Khosroshahi, Hadi ; Arita, Makoto ; Watanabe, Motonori ; Sauvage, Xavier ; Akbay, Taner ; Ishihara, Tatsumi ; Fuji, Masayoshi ; Horita, Zenji. / Photocatalytic activity of aluminum oxide by oxygen vacancy generation using high-pressure torsion straining. In: Scripta Materialia. 2019 ; Vol. 173. pp. 120-124.

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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.",

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AU - Takechi, Shuhei

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AU - Kumano, Kazuki

AU - Razavi-Khosroshahi, Hadi

AU - Arita, Makoto

AU - Watanabe, Motonori

AU - Sauvage, Xavier

AU - Akbay, Taner

AU - Ishihara, Tatsumi

AU - Fuji, Masayoshi

AU - Horita, Zenji

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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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