Volume 64, Issue 30 e202501254
Research Article

Selective C2 Electroproduction via Back Bonding in Asymmetric Copper-Copper Motifs

Chenchen Fang

Chenchen Fang

Key Laboratory for Soft Chemistry and Functional Materials, Ministry of Education School of Chemistry and Chemical Engineering, Nanjing University of Science and Technology, Nanjing, 210094 China

Both authors contributed equally to this work.

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Liming Dai

Liming Dai

Key Laboratory for Soft Chemistry and Functional Materials, Ministry of Education School of Chemistry and Chemical Engineering, Nanjing University of Science and Technology, Nanjing, 210094 China

Both authors contributed equally to this work.

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Xiaoyuan Zhang

Xiaoyuan Zhang

Key Laboratory for Soft Chemistry and Functional Materials, Ministry of Education School of Chemistry and Chemical Engineering, Nanjing University of Science and Technology, Nanjing, 210094 China

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Zhuolun Li

Zhuolun Li

Key Laboratory for Soft Chemistry and Functional Materials, Ministry of Education School of Chemistry and Chemical Engineering, Nanjing University of Science and Technology, Nanjing, 210094 China

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Yaya Wang

Yaya Wang

Key Laboratory for Soft Chemistry and Functional Materials, Ministry of Education School of Chemistry and Chemical Engineering, Nanjing University of Science and Technology, Nanjing, 210094 China

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Xuefeng Xu

Xuefeng Xu

Key Laboratory for Soft Chemistry and Functional Materials, Ministry of Education School of Chemistry and Chemical Engineering, Nanjing University of Science and Technology, Nanjing, 210094 China

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Shuo San

Shuo San

Key Laboratory for Soft Chemistry and Functional Materials, Ministry of Education School of Chemistry and Chemical Engineering, Nanjing University of Science and Technology, Nanjing, 210094 China

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Kai Liu

Kai Liu

Key Laboratory for Soft Chemistry and Functional Materials, Ministry of Education School of Chemistry and Chemical Engineering, Nanjing University of Science and Technology, Nanjing, 210094 China

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Yuchen Fu

Yuchen Fu

Key Laboratory for Soft Chemistry and Functional Materials, Ministry of Education School of Chemistry and Chemical Engineering, Nanjing University of Science and Technology, Nanjing, 210094 China

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Junjie Cui

Junjie Cui

Key Laboratory for Soft Chemistry and Functional Materials, Ministry of Education School of Chemistry and Chemical Engineering, Nanjing University of Science and Technology, Nanjing, 210094 China

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Prof. Jianfei Che

Prof. Jianfei Che

Key Laboratory for Soft Chemistry and Functional Materials, Ministry of Education School of Chemistry and Chemical Engineering, Nanjing University of Science and Technology, Nanjing, 210094 China

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Prof. Pan Xiong

Prof. Pan Xiong

Key Laboratory for Soft Chemistry and Functional Materials, Ministry of Education School of Chemistry and Chemical Engineering, Nanjing University of Science and Technology, Nanjing, 210094 China

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Prof. Yongsheng Fu

Prof. Yongsheng Fu

Key Laboratory for Soft Chemistry and Functional Materials, Ministry of Education School of Chemistry and Chemical Engineering, Nanjing University of Science and Technology, Nanjing, 210094 China

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Prof. Jingwen Sun

Corresponding Author

Prof. Jingwen Sun

Key Laboratory for Soft Chemistry and Functional Materials, Ministry of Education School of Chemistry and Chemical Engineering, Nanjing University of Science and Technology, Nanjing, 210094 China

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

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Prof. Junwu Zhu

Corresponding Author

Prof. Junwu Zhu

Key Laboratory for Soft Chemistry and Functional Materials, Ministry of Education School of Chemistry and Chemical Engineering, Nanjing University of Science and Technology, Nanjing, 210094 China

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

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First published: 20 May 2025

Graphical Abstract

Asymmetric CuF-CuN motifs were engineered through the in situ isostructural substitution method on F-Cu3N substrates. Unlike the isolated 3dz2-2pz σ bonding between CuN and the *C1 intermediate, CuF establishes an additional 3dxz-2pz π back bonding interaction. This synergy induces a charge-polarized 2*CHO adsorption configuration, concurrently enhancing coupling kinetics and C2 selectivity through dipole-dipole interactions.

Abstract

CO2 reduction reaction (CO2RR) is considered a highly attractive approach to reduce carbon emissions and yet encounters challenges in further converting *C1 intermediates to valuable two-carbon (C2) products. Although copper-based catalysts exhibit satisfactory adsorption energy for *C1 species, the symmetrical charge distribution at adjacent copper sites leads to a strong repulsive force between adsorbed *C1. Herein, asymmetric copper-copper (CuF-CuN) motifs with distinct adsorption behaviors have been constructed on the F-Cu3N substrate using the in situ isostructural substitution method. Compared to the high hybridization of CuN 3d and N 2p orbitals, implanted F not only reduces the hybridization strength but also endows the CuF with delocalized unpaired electrons. Accordingly, CuF, beyond forming an isolated 3dz2-2pz σ bond between Cu and the key *C1 intermediate (*CHO), offers additional 3dxz-2pz π back bonding to the *CHO. With dipole interactions in the asymmetric CuF-CuN motifs, the electrostatic repulsion between adjacent *CHO is diminished, efficiently promoting the C-C coupling in CO2RR. Therefore, the CuF-CuN motifs achieve an exceptional C2 selectivity of 81.5% with a partial current density of −325.9 mA cm−2 and a C2/C1 selectivity ratio of 10.47. This nuanced manipulation of atomic interactions illuminates a path to potentially groundbreaking alterations in material characteristics.

Conflict of Interests

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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