Hybrids Based on BOPHY-Conjugated Porous Polymers as Photocatalysts for Hydrogen Production: Insight into the Charge Transfer Pathway

Herein, the photocatalytic activity of four conjugated porous polymers (CPPs) based on BOPHY moiety (named IEP-x , x = 7, 8, 9, and 10) and TiO2 hybrids thereof to produce hydrogen from water under UV–vis irradiation is described. All the polymers show better performance than TiO2, and the hybrid ma...

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Published in:	ACS catalysis Vol. 10; no. 17; pp. 9804 - 9812
Main Authors:	López-Calixto, Carmen G, Barawi, Mariam, Gomez-Mendoza, Miguel, Oropeza, Freddy E, Fresno, Fernando, Liras, Marta, de la Peña O'Shea, Víctor A
Format:	Journal Article
Language:	English
Published:	American Chemical Society 04-09-2020
Subjects:	conjugated porous polymers BOPHY hybrid solar fuels photocatalytic H2 production
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Abstract	Herein, the photocatalytic activity of four conjugated porous polymers (CPPs) based on BOPHY moiety (named IEP-x , x = 7, 8, 9, and 10) and TiO2 hybrids thereof to produce hydrogen from water under UV–vis irradiation is described. All the polymers show better performance than TiO2, and the hybrid materials (only 10 wt % of polymer loading) show a higher hydrogen evolution rate than the sum of their components. The best value is recorded for the IEP-7@T-10 sample which shows 12-fold higher HER than the sum of its individual bare materials. Also, this sample with 1 wt % photodeposited platinum as cocatalyst shows a photonic efficiency ( ξ , %) of 14.54, 4.4-fold higher than the photonic efficiency of Pt/TiO2, in the same conditions. The combination of time-resolved fluorescence with transient absorption spectroscopy (TAS) measurements with the use of electron and hole scavengers allows us to determine an effective charge transfer mechanism Type II as mainly responsible for the improved photocatalytic activity.
AbstractList	Herein, the photocatalytic activity of four conjugated porous polymers (CPPs) based on BOPHY moiety (named IEP-x , x = 7, 8, 9, and 10) and TiO2 hybrids thereof to produce hydrogen from water under UV–vis irradiation is described. All the polymers show better performance than TiO2, and the hybrid materials (only 10 wt % of polymer loading) show a higher hydrogen evolution rate than the sum of their components. The best value is recorded for the IEP-7@T-10 sample which shows 12-fold higher HER than the sum of its individual bare materials. Also, this sample with 1 wt % photodeposited platinum as cocatalyst shows a photonic efficiency ( ξ , %) of 14.54, 4.4-fold higher than the photonic efficiency of Pt/TiO2, in the same conditions. The combination of time-resolved fluorescence with transient absorption spectroscopy (TAS) measurements with the use of electron and hole scavengers allows us to determine an effective charge transfer mechanism Type II as mainly responsible for the improved photocatalytic activity.
Author	Gomez-Mendoza, Miguel Barawi, Mariam de la Peña O'Shea, Víctor A Oropeza, Freddy E Liras, Marta Fresno, Fernando López-Calixto, Carmen G
AuthorAffiliation	Photoactivated Processes Unit
AuthorAffiliation_xml	– name: Photoactivated Processes Unit
Author_xml	– sequence: 1 givenname: Carmen G orcidid: 0000-0002-2771-9563 surname: López-Calixto fullname: López-Calixto, Carmen G – sequence: 2 givenname: Mariam orcidid: 0000-0001-5719-9872 surname: Barawi fullname: Barawi, Mariam – sequence: 3 givenname: Miguel orcidid: 0000-0001-6370-9998 surname: Gomez-Mendoza fullname: Gomez-Mendoza, Miguel – sequence: 4 givenname: Freddy E orcidid: 0000-0001-7222-9603 surname: Oropeza fullname: Oropeza, Freddy E – sequence: 5 givenname: Fernando orcidid: 0000-0001-6622-6721 surname: Fresno fullname: Fresno, Fernando – sequence: 6 givenname: Marta orcidid: 0000-0002-1724-1586 surname: Liras fullname: Liras, Marta email: marta.liras@imdea.org – sequence: 7 givenname: Víctor A orcidid: 0000-0001-5762-4787 surname: de la Peña O'Shea fullname: de la Peña O'Shea, Víctor A email: victor.delapenya@imdea.org
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Title	Hybrids Based on BOPHY-Conjugated Porous Polymers as Photocatalysts for Hydrogen Production: Insight into the Charge Transfer Pathway
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