{"title":"Effects of Hydroxy Groups in Anthraquinone Dyes on Photocatalytic Activity of Visible-light-sensitized Pt-TiO2 for Hydrogen Evolution","authors":"Fumiaki Amano, Yasukazu Akaki, Akira Yamakata","doi":"10.1007/s10563-022-09370-y","DOIUrl":null,"url":null,"abstract":"<p>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-TiO<sub>2</sub> system under visible-light irradiation. The 2-hydroxy group in AQ dyes was necessary to induce photocatalytic H<sub>2</sub> evolution. By contrast, the 1-hydroxy group was the anchoring group to increase the adsorption amount of the dyes on the TiO<sub>2</sub> surface. Using time-resolved infrared spectroscopy, we found that the 2-hydroxy group enhances the electron injection and suppresses the back electron transfer from TiO<sub>2</sub> particles to the dye.</p>","PeriodicalId":509,"journal":{"name":"Catalysis Surveys from Asia","volume":"27 1","pages":"75 - 83"},"PeriodicalIF":2.1000,"publicationDate":"2022-10-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"1","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Catalysis Surveys from Asia","FirstCategoryId":"92","ListUrlMain":"https://link.springer.com/article/10.1007/s10563-022-09370-y","RegionNum":4,"RegionCategory":"化学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q3","JCRName":"CHEMISTRY, PHYSICAL","Score":null,"Total":0}
引用次数: 1
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.
期刊介绍：
Early dissemination of important findings from Asia which may lead to new concepts in catalyst design is the main aim of this journal. Rapid, invited, short reviews and perspectives from academia and industry will constitute the major part of Catalysis Surveys from Asia . Surveys of recent progress and activities in catalytic science and technology and related areas in Asia will be covered regularly as well. We would appreciate critical comments from colleagues throughout the world about articles in Catalysis Surveys from Asia . If requested and thought appropriate, the comments will be included in the journal. We will be very happy if this journal stimulates global communication between scientists and engineers in the world of catalysis.
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