Enhanced cocatalyst-free photocatalytic H2 evolution by the synergistic AIE and FRET for an Ir-complex conjugated porphyrin. Issue 8 (3rd February 2022)

• Record Type: Journal Article
• Authors: Zheng, Kailin; Bodedla, Govardhana Babu; Hou, Yuqi; Zhang, Jie; Liang, Runhui; Zhao, Jianzhang; Lee Phillips, David; Zhu, Xunjin
• Is Part Of: Journal of materials chemistry. Volume 10:Issue 8(2022)
• Page Start: 4440
• Page End: 4445
• Publication Date: 2022-02-03
• Subjects: Materials -- Research -- Periodicals; Chemistry, Analytic -- Periodicals; Environmental sciences -- Research -- Periodicals; 543.0284
• DOI: 10.1039/d1ta10294j
• Languages: English
• ISSNs: 2050-7488

Abstract

Abstract : A new Ir-complex conjugated porphyrin exhibits AIE property for the Ir-complex unit, inhibition of ACQ of the porphyrin unit and efficient energy transfer from the Ir-complex to the porphyrin, therefore, enhanced photocatalytic H2 evolution. Abstract : A T-Ir complex was conjugated to a porphyrin ring via a phenylene linkage to afford a new ZnP-T-Ir photosensitizer which exhibits aggregation-induced emission (AIE) for the T-Ir unit, inhibition of aggregation caused by quenching (ACQ) of the porphyrin unit and an efficient Förster resonance energy transfer (FRET) from the T-Ir energy donor to the porphyrin energy acceptor. The ZnP-T-Ir system exhibits highly efficient cocatalyst-free photocatalytic hydrogen evolution (PHE) with a rate ( η H2 ) of 1.42 mmol g −1 h −1, which is 71-fold higher than that of the related control porphyrin, ZnP-T (0.02 mmol g −1 h −1 ) that does not contain the Ir-complex. The high η H2 of ZnP-T-Ir in cocatalyst-free PHE can be ascribed to the conjugation of the T-Ir moiety along with the synergistic effect of AIE, ACQ inhibition, and FRET, which further led to efficient UV-visible light-harvesting, a longer photoexcited electron lifetime, and thereby a more efficient electron transfer rate from the photoexcited porphyrin to the proton used for water reduction.