A Broadband and Strong Visible-light-absorbing Photosensitizer Boosts Hydrogen Evolution

Overview

Journal Nat Commun

Specialty Biology

Date 2019 Jul 19

PMID 31316076

Citations 20

Authors

Ping Wang

Song Guo

Hong-Juan Wang

Kai-Kai Chen

Nan Zhang

Zhi-Ming Zhang

Tong-Bu Lu

Affiliations

Soon will be listed here.

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)(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.

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