Iridium motif linked porphyrins for efficient light-driven hydrogen evolution via triplet state stabilization of porphyrin

Daniel Nnaemaka Tritton; Govardhana Babu Bodedla; Geliang Tang; Jianzhang Zhao; Chak Shing Kwan; Ken C F Leung; Wai Yeung Wong; Xunjin Zhu

doi:10.1039/c9ta12492f

Iridium motif linked porphyrins for efficient light-driven hydrogen evolution via triplet state stabilization of porphyrin

Daniel Nnaemaka Tritton, Govardhana Babu Bodedla, Geliang Tang, Jianzhang Zhao, Chak Shing Kwan, Ken C F Leung^*, Wai Yeung Wong^*, Xunjin Zhu^*

^*Corresponding author for this work

Department of Chemistry

Research output: Contribution to journal › Journal article › peer-review

30 Citations (Scopus)

Abstract

Two new iridium motif linked porphyrins, MBPyZnP-Ir and TBPyZnP-Ir are developed for photocatalytic hydrogen evolution (PHE). The tetra-iridium linked one, TBPyZnP-Ir, displayed the highest H₂ production rate (ηH₂) of 16.12 mmol g^-1 h^-1 within 5 h of irradiation, which is over 2.73-fold higher than MBPyZnP-Ir (5.90 mmol g^-1 h^-1) and much higher than their precursors TBPyZnP (0.12 mmol g^-1 h^-1) and MBPyZnP (0.06 mmol g^-1 h^-1) without iridium. The superior ηH₂ of TBPyZnP-Ir could be explained by the iridium motifs linked to the porphyrin, stabilizing the triplet states of the porphyrin through intramolecular energy transfer; thus enhancing electron transfer from the triplet photo-excited porphyrin moiety to the cobaloxime co-catalyst and consequently proton reduction.

Original language	English
Pages (from-to)	3005-3010
Number of pages	6
Journal	Journal of Materials Chemistry A
Volume	8
Issue number	6
Early online date	30 Dec 2019
DOIs	https://doi.org/10.1039/c9ta12492f
Publication status	Published - 14 Feb 2020

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title = "Iridium motif linked porphyrins for efficient light-driven hydrogen evolution via triplet state stabilization of porphyrin",

abstract = "Two new iridium motif linked porphyrins, MBPyZnP-Ir and TBPyZnP-Ir are developed for photocatalytic hydrogen evolution (PHE). The tetra-iridium linked one, TBPyZnP-Ir, displayed the highest H2 production rate (ηH2) of 16.12 mmol g-1 h-1 within 5 h of irradiation, which is over 2.73-fold higher than MBPyZnP-Ir (5.90 mmol g-1 h-1) and much higher than their precursors TBPyZnP (0.12 mmol g-1 h-1) and MBPyZnP (0.06 mmol g-1 h-1) without iridium. The superior ηH2 of TBPyZnP-Ir could be explained by the iridium motifs linked to the porphyrin, stabilizing the triplet states of the porphyrin through intramolecular energy transfer; thus enhancing electron transfer from the triplet photo-excited porphyrin moiety to the cobaloxime co-catalyst and consequently proton reduction.",

author = "Tritton, {Daniel Nnaemaka} and Bodedla, {Govardhana Babu} and Geliang Tang and Jianzhang Zhao and Kwan, {Chak Shing} and Leung, {Ken C F} and Wong, {Wai Yeung} and Xunjin Zhu",

note = "Funding Information: This study was supported by Hong Kong Baptist University (FRG2-16-17-024, FRG2-17-18-068, RC-ICRS-18-19-01A, RC- ICRS/15-16/02E, RC-ICRS/1617/02C-CHE, RC-IRMS/16/17/ 02CHEM), the State Key Laboratory of Environmental and Biological Analysis as well as The President's Award for Outstanding Performance in Research Supervision to K. C.-F. L. W.-Y. Wong acknowledges the nancial support from Hong Kong Research Grants Council (PolyU 153051/17P), the National Natural Science Foundation of China (51873176), the Hong Kong Polytechnic University (1-ZE1C) and Ms. Clarea Au for the Endowed Professorship in Energy (847S).",

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doi = "10.1039/c9ta12492f",

language = "English",

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T1 - Iridium motif linked porphyrins for efficient light-driven hydrogen evolution via triplet state stabilization of porphyrin

AU - Tritton, Daniel Nnaemaka

AU - Bodedla, Govardhana Babu

AU - Tang, Geliang

AU - Zhao, Jianzhang

AU - Kwan, Chak Shing

AU - Leung, Ken C F

AU - Wong, Wai Yeung

AU - Zhu, Xunjin

N1 - Funding Information: This study was supported by Hong Kong Baptist University (FRG2-16-17-024, FRG2-17-18-068, RC-ICRS-18-19-01A, RC- ICRS/15-16/02E, RC-ICRS/1617/02C-CHE, RC-IRMS/16/17/ 02CHEM), the State Key Laboratory of Environmental and Biological Analysis as well as The President's Award for Outstanding Performance in Research Supervision to K. C.-F. L. W.-Y. Wong acknowledges the nancial support from Hong Kong Research Grants Council (PolyU 153051/17P), the National Natural Science Foundation of China (51873176), the Hong Kong Polytechnic University (1-ZE1C) and Ms. Clarea Au for the Endowed Professorship in Energy (847S).

PY - 2020/2/14

Y1 - 2020/2/14

N2 - Two new iridium motif linked porphyrins, MBPyZnP-Ir and TBPyZnP-Ir are developed for photocatalytic hydrogen evolution (PHE). The tetra-iridium linked one, TBPyZnP-Ir, displayed the highest H2 production rate (ηH2) of 16.12 mmol g-1 h-1 within 5 h of irradiation, which is over 2.73-fold higher than MBPyZnP-Ir (5.90 mmol g-1 h-1) and much higher than their precursors TBPyZnP (0.12 mmol g-1 h-1) and MBPyZnP (0.06 mmol g-1 h-1) without iridium. The superior ηH2 of TBPyZnP-Ir could be explained by the iridium motifs linked to the porphyrin, stabilizing the triplet states of the porphyrin through intramolecular energy transfer; thus enhancing electron transfer from the triplet photo-excited porphyrin moiety to the cobaloxime co-catalyst and consequently proton reduction.

AB - Two new iridium motif linked porphyrins, MBPyZnP-Ir and TBPyZnP-Ir are developed for photocatalytic hydrogen evolution (PHE). The tetra-iridium linked one, TBPyZnP-Ir, displayed the highest H2 production rate (ηH2) of 16.12 mmol g-1 h-1 within 5 h of irradiation, which is over 2.73-fold higher than MBPyZnP-Ir (5.90 mmol g-1 h-1) and much higher than their precursors TBPyZnP (0.12 mmol g-1 h-1) and MBPyZnP (0.06 mmol g-1 h-1) without iridium. The superior ηH2 of TBPyZnP-Ir could be explained by the iridium motifs linked to the porphyrin, stabilizing the triplet states of the porphyrin through intramolecular energy transfer; thus enhancing electron transfer from the triplet photo-excited porphyrin moiety to the cobaloxime co-catalyst and consequently proton reduction.

UR - http://www.scopus.com/inward/record.url?scp=85079479167&partnerID=8YFLogxK

U2 - 10.1039/c9ta12492f

DO - 10.1039/c9ta12492f

M3 - Journal article

AN - SCOPUS:85079479167

SN - 2050-7488

VL - 8

SP - 3005

EP - 3010

JO - Journal of Materials Chemistry A

JF - Journal of Materials Chemistry A

IS - 6

ER -

Iridium motif linked porphyrins for efficient light-driven hydrogen evolution via triplet state stabilization of porphyrin

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