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Utility of Squaraine Dyes for Dye-Sensitized Photocatalysis on Water or Carbon Dioxide Reduction

[Image: see text] Red light-sensitized squaraine (SQ) dyes were developed and incorporated into dye-sensitized catalysts (DSCs) with the formula of SQ/TiO(2)/Cat, and their efficacies were evaluated in terms of performance on either water or carbon dioxide reduction. Pt nanoparticles or fac-[Re(4,4′...

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Autores principales: Jo, Minji, Choi, Sunghan, Jo, Ju Hyoung, Kim, So-Yoen, Kim, Pil Soo, Kim, Chul Hoon, Son, Ho-Jin, Pac, Chyongjin, Kang, Sang Ook
Formato: Online Artículo Texto
Lenguaje:English
Publicado: American Chemical Society 2019
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6733223/
https://www.ncbi.nlm.nih.gov/pubmed/31508551
http://dx.doi.org/10.1021/acsomega.9b01914
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author Jo, Minji
Choi, Sunghan
Jo, Ju Hyoung
Kim, So-Yoen
Kim, Pil Soo
Kim, Chul Hoon
Son, Ho-Jin
Pac, Chyongjin
Kang, Sang Ook
author_facet Jo, Minji
Choi, Sunghan
Jo, Ju Hyoung
Kim, So-Yoen
Kim, Pil Soo
Kim, Chul Hoon
Son, Ho-Jin
Pac, Chyongjin
Kang, Sang Ook
author_sort Jo, Minji
collection PubMed
description [Image: see text] Red light-sensitized squaraine (SQ) dyes were developed and incorporated into dye-sensitized catalysts (DSCs) with the formula of SQ/TiO(2)/Cat, and their efficacies were evaluated in terms of performance on either water or carbon dioxide reduction. Pt nanoparticles or fac-[Re(4,4′-bis-(diethoxyphosphorylmethyl)-2,2′-bipyridine)(CO)(3)Cl] were used as each catalytic center within the DSC frame of SQ/TiO(2)/Pt (Type I) or SQ/TiO(2)/Re(I) (Type II). In order to convey the potential utility of SQ in low energy sensitization, the following catalytic reductions were carried out under selective lower energy irradiation (>500 nm). Type I and II showed different catalytic performances, primarily due to the choice of solvent for each catalytic condition: hydrogenation was carried out in H(2)O, but CO(2) reduction in dimethylformamide (DMF), and SQ was more stable in aqueous acid conditions for hydrogen generation than CO(2) reduction in DMF. A suspension of Type I in 3 mL water containing 0.1 M ascorbic acid (pH = 2.66) resulted in efficient photocatalytic hydrogen evolution, producing 37 μmol of H(2) for 4 h. However, in photocatalysis of Type II (SQ/TiO(2)/Re(I)) in 3 mL DMF containing 0.1 M 1,3-dimethyl-2-phenyl-1,3-dihydrobenzimidazole, the TiO(2)-bound SQ dyes were not capable of working as a low energy sensitizer because SQ was susceptible to dye decomposition in nucleophilic DMF conditions, resulting in DSC deactivation for the CO(2) reduction. Even with the limitation of solvent, the DSC conditions for the utility of SQ have been established: the anchoring group effect of SQ with either phosphonic acid or carboxylic acid onto the TiO(2) surface; energy alignment of SQ with the flat band potentials (E(fb)) of TiO(2) semiconductors and the reduction power of electron donors; and the wavelength range of the light source used, particularly when >500 nm.
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spelling pubmed-67332232019-09-10 Utility of Squaraine Dyes for Dye-Sensitized Photocatalysis on Water or Carbon Dioxide Reduction Jo, Minji Choi, Sunghan Jo, Ju Hyoung Kim, So-Yoen Kim, Pil Soo Kim, Chul Hoon Son, Ho-Jin Pac, Chyongjin Kang, Sang Ook ACS Omega [Image: see text] Red light-sensitized squaraine (SQ) dyes were developed and incorporated into dye-sensitized catalysts (DSCs) with the formula of SQ/TiO(2)/Cat, and their efficacies were evaluated in terms of performance on either water or carbon dioxide reduction. Pt nanoparticles or fac-[Re(4,4′-bis-(diethoxyphosphorylmethyl)-2,2′-bipyridine)(CO)(3)Cl] were used as each catalytic center within the DSC frame of SQ/TiO(2)/Pt (Type I) or SQ/TiO(2)/Re(I) (Type II). In order to convey the potential utility of SQ in low energy sensitization, the following catalytic reductions were carried out under selective lower energy irradiation (>500 nm). Type I and II showed different catalytic performances, primarily due to the choice of solvent for each catalytic condition: hydrogenation was carried out in H(2)O, but CO(2) reduction in dimethylformamide (DMF), and SQ was more stable in aqueous acid conditions for hydrogen generation than CO(2) reduction in DMF. A suspension of Type I in 3 mL water containing 0.1 M ascorbic acid (pH = 2.66) resulted in efficient photocatalytic hydrogen evolution, producing 37 μmol of H(2) for 4 h. However, in photocatalysis of Type II (SQ/TiO(2)/Re(I)) in 3 mL DMF containing 0.1 M 1,3-dimethyl-2-phenyl-1,3-dihydrobenzimidazole, the TiO(2)-bound SQ dyes were not capable of working as a low energy sensitizer because SQ was susceptible to dye decomposition in nucleophilic DMF conditions, resulting in DSC deactivation for the CO(2) reduction. Even with the limitation of solvent, the DSC conditions for the utility of SQ have been established: the anchoring group effect of SQ with either phosphonic acid or carboxylic acid onto the TiO(2) surface; energy alignment of SQ with the flat band potentials (E(fb)) of TiO(2) semiconductors and the reduction power of electron donors; and the wavelength range of the light source used, particularly when >500 nm. American Chemical Society 2019-08-16 /pmc/articles/PMC6733223/ /pubmed/31508551 http://dx.doi.org/10.1021/acsomega.9b01914 Text en Copyright © 2019 American Chemical Society This is an open access article published under an ACS AuthorChoice License (http://pubs.acs.org/page/policy/authorchoice_termsofuse.html) , which permits copying and redistribution of the article or any adaptations for non-commercial purposes.
spellingShingle Jo, Minji
Choi, Sunghan
Jo, Ju Hyoung
Kim, So-Yoen
Kim, Pil Soo
Kim, Chul Hoon
Son, Ho-Jin
Pac, Chyongjin
Kang, Sang Ook
Utility of Squaraine Dyes for Dye-Sensitized Photocatalysis on Water or Carbon Dioxide Reduction
title Utility of Squaraine Dyes for Dye-Sensitized Photocatalysis on Water or Carbon Dioxide Reduction
title_full Utility of Squaraine Dyes for Dye-Sensitized Photocatalysis on Water or Carbon Dioxide Reduction
title_fullStr Utility of Squaraine Dyes for Dye-Sensitized Photocatalysis on Water or Carbon Dioxide Reduction
title_full_unstemmed Utility of Squaraine Dyes for Dye-Sensitized Photocatalysis on Water or Carbon Dioxide Reduction
title_short Utility of Squaraine Dyes for Dye-Sensitized Photocatalysis on Water or Carbon Dioxide Reduction
title_sort utility of squaraine dyes for dye-sensitized photocatalysis on water or carbon dioxide reduction
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6733223/
https://www.ncbi.nlm.nih.gov/pubmed/31508551
http://dx.doi.org/10.1021/acsomega.9b01914
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