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Antenna Effect in BODIPY-(Zn)Porphyrin Entities Promotes H2 Evolution in Dye-Sensitized Photocatalytic Systems

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posted on 09.09.2021, 09:13 authored by Vasilis Nikolaou, Georgios Charalambidis, Georgios Landrou, Emmanouil Nikoloudakis, Aurélien Planchat, Ronilnta Tsalameni, Karen Junghans, Axel Kahnt, Fabrice Odobel, Athanassios G. Coutsolelos
In this study, we report the utilization of BODIPY-(Zn)­Porphyrin hybrids in photocatalytic H2 production from water. These entities were applied as photosensitizers upon their chemisorption onto the surface of platinum-doped titanium dioxide nanoparticles (Pt-TiO2), which acted as photocatalysts. To evaluate the impact of the different connectivity between the chromophores in photocatalytic in H2 evolution, we employed two diverse BODIPY-(Zn)­Porphyrin entities, in which the BODIPY moiety is either covalently attached (BDP-Por) or axially coordinated (BDP­(Im)-Por) with the (Zn)­Porphyrin. The covalently connected dyad (BDP-Por) presented higher catalytic activity (17 500 TONs) compared to the axial coordinated (BDP­(Im)-Por, 13 700 TONs). In BDP-Por dyad, an additional BDP­(Im) moiety was introduced and the formed hybrid (BDP-Por-BDP­(Im)) outperformed the aforementioned systems, due to the enhanced light harvesting ability. Overall, we developed highly efficient dye-sensitized photocatalytic systems (DSPs) based on noble-metal-free photosensitizers reaching 18 600 turnover numbers (TONs) and 225 mmol­(H2) g­(cat)−1 h–1.

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