Volume 135, Issue 7 e202215687
Forschungsartikel

Boosting Electroreduction of CO2 over Cationic Covalent Organic Frameworks: Hydrogen Bonding Effects of Halogen Ions

Qiu-Jin Wu

Qiu-Jin 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

University of Chinese Academy of Sciences, Beijing, 100049 P. R. China

Contribution: ​Investigation (lead), Writing - original draft (lead)

Search for more papers by this author
Dr. Duan-Hui Si

Dr. Duan-Hui Si

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

Contribution: Methodology (lead), Writing - review & editing (supporting)

Search for more papers by this author
Qiao Wu

Qiao 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

Contribution: Data curation (supporting)

Search for more papers by this author
Yu-Liang Dong

Yu-Liang Dong

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

Contribution: Data curation (supporting)

Search for more papers by this author
Prof. Rong Cao

Prof. Rong Cao

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

University of Chinese Academy of Sciences, Beijing, 100049 P. R. China

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

Contribution: Conceptualization (equal), Funding acquisition (supporting), Writing - review & editing (supporting)

Search for more papers by this author
Prof. Yuan-Biao Huang

Corresponding Author

Prof. Yuan-Biao Huang

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

University of Chinese Academy of Sciences, Beijing, 100049 P. R. China

Contribution: Conceptualization (lead), Funding acquisition (lead), Writing - review & editing (lead)

Search for more papers by this author
First published: 24 November 2022
Citations: 3

Abstract

We present the first example of charged imidazolium functionalized porphyrin-based covalent organic framework (Co-iBFBim-COF-X) for electrocatalytic CO2 reduction reaction, where the free anions (e.g., F, Cl, Br, and I) of imidazolium ions nearby the active Co sites can stabilize the key intermediate *COOH and inhibit hydrogen evolution reaction. Thus, Co-iBFBim-COF-X exhibits higher activity than the neutral Co-BFBim-COF, following the trend of F<Cl<Br<I. Particularly, the Co-iBFBim-COF-I showed nearly 100 % CO2 selectivity at a low full-cell voltage of 2.3 V, and achieved a high CO2 partial current density of 52 mA cm−2 with a turnover frequency of 3018 h−1 at 2.4 V in the anion membrane electrode assembly, which is 3.57 times larger than that of neutral Co-BFBim-COF. This work provides new insight into the importance of free anions in the stabilization of intermediates and decreasing the local binding energy of H2O with active moiety to enhance CO2 reduction reaction.

Conflict of interest

The authors declare no conflict of interest.

Data Availability Statement

The data that support the findings of this study are available in the supplementary material of this article or from the corresponding author on request.

The full text of this article hosted at iucr.org is unavailable due to technical difficulties.