TY - JOUR
T1 - Effects of Hydroxy Groups in Anthraquinone Dyes on Photocatalytic Activity of Visible-light-sensitized Pt-TiO2 for Hydrogen Evolution
AU - Amano, Fumiaki
AU - Akaki, Yasukazu
AU - Yamakata, Akira
N1 - Funding Information:
This work was supported by JSPS KAKENHI [grant numbers JP23655187, JP23686114, JP20H02525, and JP20H05838].
Publisher Copyright:
© 2022, The Author(s), under exclusive licence to Springer Science+Business Media, LLC, part of Springer Nature.
PY - 2022
Y1 - 2022
N2 - Abstract: Alizarin (1,2-dihydroxyanthraquinone) is a stable red photoredox sensitizer. We explored the effect of the hydroxy substituents of 9,10-anthraquinone (AQ) molecules on the photocatalytic hydrogen evolution over a dye-sensitized Pt-TiO2 system under visible-light irradiation. The 2-hydroxy group in AQ dyes was necessary to induce photocatalytic H2 evolution. By contrast, the 1-hydroxy group was the anchoring group to increase the adsorption amount of the dyes on the TiO2 surface. Using time-resolved infrared spectroscopy, we found that the 2-hydroxy group enhances the electron injection and suppresses the back electron transfer from TiO2 particles to the dye. Graphical Abstract: [Figure not available: see fulltext.]
AB - Abstract: Alizarin (1,2-dihydroxyanthraquinone) is a stable red photoredox sensitizer. We explored the effect of the hydroxy substituents of 9,10-anthraquinone (AQ) molecules on the photocatalytic hydrogen evolution over a dye-sensitized Pt-TiO2 system under visible-light irradiation. The 2-hydroxy group in AQ dyes was necessary to induce photocatalytic H2 evolution. By contrast, the 1-hydroxy group was the anchoring group to increase the adsorption amount of the dyes on the TiO2 surface. Using time-resolved infrared spectroscopy, we found that the 2-hydroxy group enhances the electron injection and suppresses the back electron transfer from TiO2 particles to the dye. Graphical Abstract: [Figure not available: see fulltext.]
KW - Dye-sensitized photocatalyst
KW - Hydrogen evolution reaction
KW - Organic dye
KW - Titanium dioxide
KW - Visible-light-driven photocatalyst
UR - http://www.scopus.com/inward/record.url?scp=85140344338&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=85140344338&partnerID=8YFLogxK
U2 - 10.1007/s10563-022-09370-y
DO - 10.1007/s10563-022-09370-y
M3 - Article
AN - SCOPUS:85140344338
SN - 1571-1013
JO - Catalysis Surveys from Asia
JF - Catalysis Surveys from Asia
ER -