Volume 20, Issue 43 2403285
Research Article

Electrochemical Synthesis of Urea: Co-Reduction of Nitrite and Carbon Dioxide on Binuclear Cobalt Phthalocyanine

Rui Zhang

Rui Zhang

International Joint Laboratory of Catalytic Chemistry, Department of Chemistry, Institute for Sustainable Energy, College of Sciences, Shanghai University, No. 99 Shangda Road, Shanghai, 200444 China

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Wenhui Hu

Wenhui Hu

International Joint Laboratory of Catalytic Chemistry, Department of Chemistry, Institute for Sustainable Energy, College of Sciences, Shanghai University, No. 99 Shangda Road, Shanghai, 200444 China

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Jingjing Liu

Jingjing Liu

International Joint Laboratory of Catalytic Chemistry, Department of Chemistry, Institute for Sustainable Energy, College of Sciences, Shanghai University, No. 99 Shangda Road, Shanghai, 200444 China

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Kaidi Xu

Kaidi Xu

International Joint Laboratory of Catalytic Chemistry, Department of Chemistry, Institute for Sustainable Energy, College of Sciences, Shanghai University, No. 99 Shangda Road, Shanghai, 200444 China

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Yi Liu

Yi Liu

International Joint Laboratory of Catalytic Chemistry, Department of Chemistry, Institute for Sustainable Energy, College of Sciences, Shanghai University, No. 99 Shangda Road, Shanghai, 200444 China

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Yahong Yao

Yahong Yao

International Joint Laboratory of Catalytic Chemistry, Department of Chemistry, Institute for Sustainable Energy, College of Sciences, Shanghai University, No. 99 Shangda Road, Shanghai, 200444 China

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Minmin Liu

Corresponding Author

Minmin Liu

International Joint Laboratory of Catalytic Chemistry, Department of Chemistry, Institute for Sustainable Energy, College of Sciences, Shanghai University, No. 99 Shangda Road, Shanghai, 200444 China

E-mail: [email protected]; [email protected]; [email protected]

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Xia-Guang Zhang

Xia-Guang Zhang

Key Laboratory of Green Chemical Media and Reactions, Ministry of Education, Collaborative Innovation Center of Henan Province for Green Manufacturing of Fine Chemicals, College of Chemistry and Chemical Engineering, Henan Normal University, Xinxiang, 453007 China

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Hong Li

Corresponding Author

Hong Li

Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials, Collaborative Innovation Center of Chemistry for Energy Materials, Department of Chemistry, Fudan University, Shanghai, 200438 China

E-mail: [email protected]; [email protected]; [email protected]

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Peng He

Peng He

Department of Chemical and Biomolecular Engineering, University of Notre Dame, Notre Dame, ID, 46556 USA

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Shengjuan Huo

Corresponding Author

Shengjuan Huo

International Joint Laboratory of Catalytic Chemistry, Department of Chemistry, Institute for Sustainable Energy, College of Sciences, Shanghai University, No. 99 Shangda Road, Shanghai, 200444 China

E-mail: [email protected]; [email protected]; [email protected]

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First published: 20 June 2024
Citations: 5

Abstract

Exploration of molecular catalysts with the atomic-level tunability of molecular structures offers promising avenues for developing high-performance catalysts for the electrochemical co-reduction reaction of carbon dioxide (CO2) and nitrite (NO2) into value-added urea. In this work, a binuclear cobalt phthalocyanine (biCoPc) catalyst is prepared through chemical synthesis and applied as a C─N coupling catalyst toward urea. Achieving a remarkable Faradaic efficiency of 47.4% for urea production at –0.5 V versus reversible hydrogen electrode (RHE), this biCoPc outperforms many known molecular catalysts in this specific application. Its unique planar macromolecular structure and the increased valence state of cobalt promote the adsorption of nitrogenous and carbonaceous species, a critical factor in facilitating the multi-electron C─N coupling. Combining highly sensitive in situ attenuated total reflection surface-enhanced infrared absorption spectroscopy (ATR-SEIRAS) with density functional theory (DFT) calculations, the linear adsorbed CO (COL) and bridge adsorbed CO (COB) is captured on biCoPc catalyst during the co-reduction reaction. COB, a pivotal intermediate in the co-reduction from CO2 and nitrite to urea, is evidenced to be labile and may be attacked by nitrite, promoting urea production. This work demonstrates the importance of designing molecular catalysts for efficient co-reduction of CO2 and nitrite to urea.

Conflict of Interest

The authors declare no conflict of interest.

Data Availability Statement

The data that support the findings of this study are available from the corresponding author upon reasonable request.

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