Unblocked intramolecular charge transfer for enhanced CO2 photoreduction enabled by an imidazolium-based ionic conjugated microporous polymer

Zhao, Wenling ¹Zhai, Dong ¹Liu, Chengcheng ¹Zheng, Daoyuan ¹Wu, Hao ¹Sun, Lei ¹Li, Zhen ¹Yu, Tie ¹Zhou, Wei ¹Fang, Xu ¹Zhai, Shengliang ¹Han, Keli ¹He, Zuoli ²Deng, Wei-qiao¹

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作者信息

1. Shandong Univ, Inst Mol Sci & Engn, Inst Frontier & Interdisciplinary Sci, Qingdao 266237, Shandong, Peoples R China
2. Shandong Univ, Sch Environm Sci & Engn, Shandong Key Lab Water Pollut Control & Resource, Qingdao 266237, Shandong, Peoples R China
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Abstract

Efficient solar energy-driven conversion of CO2 to valuable chemicals is challenging. Here we design an imidazolium-based ionic conjugated microporous polymer (ImI-CMP), which unblocks readily intramolecular charge transfer and triggers CO2 photoreduction. Under visible light irradiation, ImI-CMP incorporated with Co (II) species exhibits a high CO production rate of 2953 mu mol g-1 h-1 and a turnover frequency of 30.8 h-1; these numbers are competitive to that of the best porous organic polymers. The mechanism studies reveal that two factors play key roles in the outstanding photocatalytic performance. First, the imidazolium motifs on the ImICMP enhance the activation of CO2. Second, pi-conjugation structure and the built-in electric field allow ultrafast intramolecular photoinduced electron transfer in the ImI-CMP. This work provides a new strategy for designing high-performance organic photocatalysts for CO2 reduction by combining cationic imidazolium motifs and pi-conjugation structures.

Key words

Carbon dioxide fixation/Conjugated microporous polymer/Intramolecular electron transfer/Imidazole/Photocatalysis

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出版年

2022

Applied Catalysis

ISSN：0926-3373

被引量18

参考文献量56

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