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 | |
| Publication status | Published - Dec 1 2019 |
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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 journal › Article
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TY - JOUR
T1 - Photocatalytic activity of aluminum oxide by oxygen vacancy generation using high-pressure torsion straining
AU - Edalati, Kaveh
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.
PY - 2019/12/1
Y1 - 2019/12/1
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.
UR - http://www.scopus.com/inward/record.url?scp=85070626349&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85070626349&partnerID=8YFLogxK
U2 - 10.1016/j.scriptamat.2019.08.011
DO - 10.1016/j.scriptamat.2019.08.011
M3 - Article
AN - SCOPUS:85070626349
VL - 173
SP - 120
EP - 124
JO - Scripta Materialia
JF - Scripta Materialia
SN - 1359-6462
ER -