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This is a In Vitro Study study.

August 26, 2025

Acetylene‐Linked Octupolar Conjugated Microporous Polymers for CO2 Photoreduction to Methanol: Effect of Acceptor and π‐Bridge Modulation

Key Points

The optimized polymer achieved a methanol production rate of 30.8 µmol g−1 h−1, with 90.3% selectivity in photocatalytic CO2 reduction.
These acetylene-linked polymers feature specialized donor–acceptor structures that enhance photocatalytic performance through effective charge separation.
The study utilized experimental and theoretical methods to analyze the role of triazine and biphenyl in reducing exciton binding energy.
These findings may advance the development of efficient photocatalysts for sustainable energy applications in CO2 reduction.

Abstract

Abstract The development of efficient, metal‐free photocatalysts for solar‐driven CO 2 reduction to methanol is promising for alleviating energy and environmental issues, but achieving high selectivity and conversion efficiency without sacrificial agents or co‐catalysts remains a challenge. In this work, we report a series of acetylene‐linked specialized donor–acceptor (D–A) type conjugated microporous polymers (CMPs) designed with tailored electronic structures to investigate their efficacy in photocatalytic CO 2 reduction to methanol in an aqueous NaOH solution under visible light irradiation. Significantly, the optimized porous polymer TTT‐DEBP, featuring a strong electron‐accepting triazine ring and an extended π‐conjugated diethynyl biphenyl (DEBP) system, achieved a higher CH 3 OH production rate of 30.8 µmol g −1 h −1 with 90.3% selectivity and excellent recyclability. Experimental and theoretical investigations revealed that the synergistic effect of triazine, biphenyl, and acetylene moieties of the porous network reduces exciton binding energy, enhancing charge separation and transfer, and reduces charge recombination for improved photocatalytic performance.

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