期刊
JOURNAL OF THE AMERICAN CHEMICAL SOCIETY
卷 143, 期 39, 页码 16284-16292出版社
AMER CHEMICAL SOC
DOI: 10.1021/jacs.1c07916
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-
资金
- Department of Science and Technology (DST) [CRG/2019/005951]
This study achieved a two-electron photochemical CO2 reduction process using a metal-free system with the redox-active conjugated microporous polymer TPA-PQ, showing impressive efficiency and selectivity. Mechanistic analysis demonstrated the role of photoactivated ICT in driving the photoreduction of CO2 to CH4 by TPA-PQ. Compared to other similar redox-active CMPs, TPA-PQ exhibited higher catalytic activity towards CO2 photoreduction.
Achieving more than a two-electron photochemical CO2 reduction process using a metal-free system is quite exciting and challenging, as it needs proper channeling of electrons. In the present study, we report the rational design and synthesis of a redox-active conjugated microporous polymer (CMP), TPA-PQ, by assimilating an electron donor, tris(4-ethynylphenyl)amine (TPA), with an acceptor, phenanthraquinone (PQ). The TPA-PQ shows intramolecular charge-transfer (ICT)-assisted catalytic activity for visible-light-driven photoreduction of CO2 to CH4 (yield = 32.2 mmol g(-1)) with an impressive rate (2.15 mmol h(-1) g(-1)) and high selectivity (>97%). Mechanistic analysis based on experimental results, in situ DRIFTS, and computational studies reveals that the potential of TPA-PQ for catalyzing photoreduction of CO2 to CH4 was energetically driven by photoactivated ICT upon surface adsorption of CO2, wherein adjacent keto groups of PQ unit play a pivotal role. The critical role of ICT for stimulating photocatalysis is further illustrated by synthesizing another redox-active CMP (TEB-PQ), bearing triethynylbenzene (TEB) and PQ, that shows 8-fold lesser activity for photoreduction toward CO2 to CH4 (yield = 4.4 mmol g(-1)) as compared to TPA-PQ. The results demonstrate a novel concept for CO2 photoreduction to CH4 using an efficient, sustainable, and recyclable metal-free robust organic photocatalyst.
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