NDLI: Hydrophilicity Control of Visible-Light Hydrogen Evolution and Dynamics of the Charge-Separated State in $Dye/TiO_{2}/Pt$ Hybrid Systems

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Hydrophilicity Control of Visible-Light Hydrogen Evolution and Dynamics of the Charge-Separated State in $Dye/TiO_{2}/Pt$ Hybrid Systems

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Hydrophilicity Control of Visible-Light Hydrogen Evolution and Dynamics of the Charge-Separated State in $Dye/TiO_{2}/Pt$ Hybrid Systems

Content Provider	World Health Organization (WHO)-Global Index Medicus
Author	Inoue, Haruo Kang, Sang Ook Han, Won-sik Nabetani, Yu Choi, Heesung Pac, Chyongjin Shimada, Tetsuya Wee, Kyung-ryang Yamamoto, Daisuke Cho, Kyeongjae Kim, Hyun-young
Description	Author Affiliation: Han WS ( Department of Advanced Materials Chemistry, Sejong, Korea University, 208 Seochang, Chochiwon, Chung-nam 339-700, Korea.)
Abstract	Visible-light-driven $H_{2}$ evolution based on $Dye/TiO_{2}/Pt$ hybrid photocatalysts was investigated for a series of $(E)-3-(5′-\{4-[bis(4-R^{1}-phenyl)amino]phenyl\}-4,4′-(R^{2})_{2}-2,2′-bithiophen-5-yl)-2-cyanoacrylic$ acid dyes. Efficiencies of hydrogen evolution from aqueous suspensions in the presence of ethylenediaminetetraacetic acid as electron donor under illumination at λ>420 nm were found to considerably depend on the hydrophilic character of $R^{1},$ varying in the order MOD $(R^{1}=CH_{3}OCH_{2},$ $R^{2}=H)≈MO4D$ $(R^{1}=R^{2}=CH_{3}OCH_{2})>HD$ $(R^{1}=R^{2}=H)>PD$ $(R^{1}=C_{3}H_{7},$ $R^{2}=H).$ In the case of $MOD/TiO_{2}/Pt,$ the apparent quantum yield for photocatalyzed $H_{2}$ generation at 436 nm was 0.27±0.03. Transient absorption measurements for MOD- or PD-grafted transparent films of $TiO_{2}$ nanoparticles dipped into water at pH 3 commonly revealed ultrafast formation (<100 fs) of the dye radical cation $(Dye^{.+})$ followed by multicomponent decays, which involve minor fast decays (<5 ps) almost independent of $R^{1}$ and major slower decays with significant differences between the two samples: 1) the early decay of the major components for MOD is about 2.5 times slower than that for PD and 2) a redshift of the spectrum occurred for MOD with a time constant of 17 ps, but not for PD. The substituent effects on $H_{2}$ generation as well as on transient behavior have been discussed in terms substituent-dependent charge recombination (CR) of $Dye^{.+}$ with electrons in bulk, inner-trap, and/or interstitial-trap states, arising from different solvent reorganization.
ISSN	09476539
e-ISSN	15213765
Journal	Chemistry - A European Journal
Issue Number	48
Volume Number	18
Language	English
Publisher	Wiley-VCH;ChemPubSoc Europe
Publisher Date	2012-11-26
Publisher Place	Germany
Access Restriction	Open
Subject Keyword	Chemistry
Content Type	Text
Resource Type	Article
Subject	Organic Chemistry Catalysis

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