A broadband and strong visible-light-absorbing photosensitizer boosts hydrogen evolution

Ping Wang, Song Guo (), Hong-Juan Wang, Kai-Kai Chen, Nan Zhang, Zhi-Ming Zhang () and Tong-Bu Lu ()
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Ping Wang: Tianjin University of Technology
Song Guo: Tianjin University of Technology
Hong-Juan Wang: Tianjin University of Technology
Kai-Kai Chen: Tianjin University of Technology
Nan Zhang: Tianjin University of Technology
Zhi-Ming Zhang: Tianjin University of Technology
Tong-Bu Lu: Tianjin University of Technology

Nature Communications, 2019, vol. 10, issue 1, 1-12

Abstract: Abstract Developing broadband and strong visible-light-absorbing photosensitizer is highly desired for dramatically improving the utilization of solar energy and boosting artificial photosynthesis. Herein, we develop a facile strategy to co-sensitize Ir-complex with Coumarins and boron dipyrromethene to explore photosensitizer with a broadband covering ca. 50% visible light region (Ir-4). This type of photosensitizer is firstly introduced into water splitting system, exhibiting significantly enhanced performance with over 21 times higher than that of typical Ir(ppy)2(bpy)+, and the turnover number towards Ir-4 reaches to 115840, representing the most active sensitizer among reported molecular photocatalytic systems. Experimental and theoretical investigations reveal that the Ir-mediation not only achieves a long-lived boron dipyrromethene-localized triplet state, but also makes an efficient excitation energy transfer from Coumarin to boron dipyrromethene to trigger the electron transfer. These findings provide an insight for developing broadband and strong visible-light-absorbing multicomponent arrays on molecular level for efficient artificial photosynthesis.

Date: 2019
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DOI: 10.1038/s41467-019-11099-8

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