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

Kaveh 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

Research output: Contribution to journalArticle

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 languageEnglish
Pages (from-to)120-124
Number of pages5
JournalScripta Materialia
Volume173
DOIs
Publication statusPublished - Dec 1 2019

Fingerprint

Aluminum Oxide
Oxygen vacancies
Torsional stress
Oxides
torsion
Energy gap
aluminum oxides
Aluminum
Photocatalysis
Optical band gaps
oxygen
Photocatalysts
insulators
Plastic deformation
Earth crust
Coloring Agents
Alumina
oxides
Dyes
Earth (planet)

All Science Journal Classification (ASJC) codes

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

Cite this

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

In: Scripta Materialia, Vol. 173, 01.12.2019, p. 120-124.

Research output: Contribution to journalArticle

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