Volume 61, Issue 1 e202111622
Research Article
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Energy Band Alignment and Redox-Active Sites in Metalloporphyrin-Spaced Metal-Catechol Frameworks for Enhanced CO2 Photoreduction

Dr. Er-Xia Chen

Dr. Er-Xia Chen

State Key Laboratory of Structural Chemistry, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou, Fujian, 350002 P. R. China

Fujian Science & Technology Innovation Laboratory for Optoelectronic Information of China, Fuzhou, Fujian, 350108 P. R. China

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Dr. Mei Qiu

Dr. Mei Qiu

State Key Laboratory of Structural Chemistry, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou, Fujian, 350002 P. R. China

College of Chemistry, Jiangxi Agricultural University, Nanchang, Jiangxi, 330045 P. R. China

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Prof. Yong-Fan Zhang

Prof. Yong-Fan Zhang

College of Chemistry, Fuzhou University, Fuzhou, Fujian, 350116 P. R. China

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Liang He

Liang He

State Key Laboratory of Structural Chemistry, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou, Fujian, 350002 P. R. China

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Ya-Yong Sun

Ya-Yong Sun

State Key Laboratory of Structural Chemistry, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou, Fujian, 350002 P. R. China

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Hui-Li Zheng

Hui-Li Zheng

State Key Laboratory of Structural Chemistry, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou, Fujian, 350002 P. R. China

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Dr. Xin Wu

Dr. Xin Wu

State Key Laboratory of Structural Chemistry, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou, Fujian, 350002 P. R. China

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Prof. Jian Zhang

Corresponding Author

Prof. Jian Zhang

State Key Laboratory of Structural Chemistry, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou, Fujian, 350002 P. R. China

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Prof. Qipu Lin

Corresponding Author

Prof. Qipu Lin

State Key Laboratory of Structural Chemistry, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou, Fujian, 350002 P. R. China

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First published: 15 October 2021
Citations: 38

Graphical Abstract

A series of hydro-stable metalloporphyrin-bridged metal-phenate frameworks are constructed, which exhibit artificial photosynthetic activity under visible-light irradiation without photosensitizer or sacrificial agent. Activity is boosted by substitution of the Fe-oxo chain for an In-oxo chain, and further enhanced by addition of the uncoordinated hydroxyl groups of catechol into the scaffold.

Abstract

Two new chemically stable metalloporphyrin-bridged metal-catechol frameworks, InTCP-Co and FeTCP-Co, were constructed to achieve artificial photosynthesis without additional sacrificial agents and photosensitizers. The CO2 photoreduction rate over FeTCP-Co considerably exceeds that obtained over InTCP-Co, and the incorporation of uncoordinated hydroxyl groups, associated with catechol, into the network further promotes the photocatalytic activity. The iron-oxo coordination chain assists energy band alignment and provides a redox-active site, and the uncoordinated hydroxyl group contributes to the visible-light absorptance, charge-carrier transfer, and CO2-scaffold affinity. With a formic acid selectivity of 97.8 %, FeTCP-OH-Co affords CO2 photoconversion with a reaction rate 4.3 and 15.7 times higher than those of FeTCP- Co and InTCP-Co, respectively. These findings are also consistent with the spectroscopic study and DFT calculation.

Conflict of interest

The authors declare no conflict of interest.

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