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 R?gion 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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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 -