TY - JOUR
T1 - Black brookite rich in oxygen vacancies as an active photocatalyst for CO2 conversion
T2 - Experiments and first-principles calculations
AU - Katai, Masae
AU - Edalati, Parisa
AU - Hidalgo-Jimenez, Jacqueline
AU - Shundo, Yu
AU - Akbay, Taner
AU - Ishihara, Tatsumi
AU - Arita, Makoto
AU - Fuji, Masayoshi
AU - Edalati, Kaveh
N1 - Publisher Copyright:
© 2023 Elsevier B.V.
PY - 2024/4/1
Y1 - 2024/4/1
N2 - Photocatalytic CO2 conversion is a clean technology to deal with CO2 emissions, and titanium oxide (TiO2) polymorphs are the most investigated photocatalysts for such an application. In this study, black TiO2 brookite is produced by a high-pressure torsion (HPT) method and employed as an active photocatalyst for CO2 conversion. Black brookite with a large concentration of lattice defects (vacancies, dislocations and grain boundaries) showed enhanced light absorbance, narrowed optical bandgap and diminished recombination rate of electrons and holes. The photocatalytic activity of the black oxide for CO2 conversion was higher compared to commercial brookite and benchmark P25 catalyst powders. First-principles calculations suggested that the presence of oxygen vacancies in black brookite is effective not only for reducing optical bandgap but also for providing active sites for the adsorption of CO2 on the surface of TiO2.
AB - Photocatalytic CO2 conversion is a clean technology to deal with CO2 emissions, and titanium oxide (TiO2) polymorphs are the most investigated photocatalysts for such an application. In this study, black TiO2 brookite is produced by a high-pressure torsion (HPT) method and employed as an active photocatalyst for CO2 conversion. Black brookite with a large concentration of lattice defects (vacancies, dislocations and grain boundaries) showed enhanced light absorbance, narrowed optical bandgap and diminished recombination rate of electrons and holes. The photocatalytic activity of the black oxide for CO2 conversion was higher compared to commercial brookite and benchmark P25 catalyst powders. First-principles calculations suggested that the presence of oxygen vacancies in black brookite is effective not only for reducing optical bandgap but also for providing active sites for the adsorption of CO2 on the surface of TiO2.
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U2 - 10.1016/j.jphotochem.2023.115409
DO - 10.1016/j.jphotochem.2023.115409
M3 - Article
AN - SCOPUS:85179855444
SN - 1010-6030
VL - 449
JO - Journal of Photochemistry and Photobiology A: Chemistry
JF - Journal of Photochemistry and Photobiology A: Chemistry
M1 - 115409
ER -