Volume 61, Issue 2 e202111700
Research Article

Highly Ethylene-Selective Electrocatalytic CO2 Reduction Enabled by Isolated Cu−S Motifs in Metal–Organic Framework Based Precatalysts

Chun Fang Wen

Chun Fang Wen

Key Laboratory for Ultrafine Materials of Ministry of Education, School of Materials Science and Engineering, East China University of Science and Technology, 130 Meilong Road, Shanghai, 200237 China

These authors contributed equally to this work.

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Min Zhou

Min Zhou

Key Laboratory for Advanced Materials, School of Chemistry and Molecular Engineering, East China University of Science and Technology, 130 Meilong Road, Shanghai, 200237 China

These authors contributed equally to this work.

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Dr. Peng Fei Liu

Corresponding Author

Dr. Peng Fei Liu

Key Laboratory for Ultrafine Materials of Ministry of Education, School of Materials Science and Engineering, East China University of Science and Technology, 130 Meilong Road, Shanghai, 200237 China

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Yuanwei Liu

Yuanwei Liu

Key Laboratory for Ultrafine Materials of Ministry of Education, School of Materials Science and Engineering, East China University of Science and Technology, 130 Meilong Road, Shanghai, 200237 China

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Xuefeng Wu

Xuefeng Wu

Key Laboratory for Ultrafine Materials of Ministry of Education, School of Materials Science and Engineering, East China University of Science and Technology, 130 Meilong Road, Shanghai, 200237 China

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Dr. Fangxin Mao

Dr. Fangxin Mao

Key Laboratory for Ultrafine Materials of Ministry of Education, School of Materials Science and Engineering, East China University of Science and Technology, 130 Meilong Road, Shanghai, 200237 China

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Prof. Sheng Dai

Prof. Sheng Dai

Key Laboratory for Advanced Materials and Feringa Nobel Prize Scientist Joint Research Center, Institute of Fine Chemicals, School of Chemistry and Molecular Engineering, East China University of Science and Technology, 130 Meilong Road, Shanghai, 200237 China

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Beibei Xu

Beibei Xu

Physics Department and Shanghai Key Laboratory of Magnetic Resonance, School of Physics and Materials Science, East China Normal University, 3663 North Zhongshan Road, Shanghai, 200062 China

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Prof. Xue Lu Wang

Prof. Xue Lu Wang

Physics Department and Shanghai Key Laboratory of Magnetic Resonance, School of Physics and Materials Science, East China Normal University, 3663 North Zhongshan Road, Shanghai, 200062 China

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Prof. Zheng Jiang

Prof. Zheng Jiang

Shanghai Synchrotron Radiation Facility, Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai, 201204 China

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Prof. P. Hu

Prof. P. Hu

Key Laboratory for Advanced Materials, School of Chemistry and Molecular Engineering, East China University of Science and Technology, 130 Meilong Road, Shanghai, 200237 China

School of Chemistry and Chemical Engineering, The Queen's University of Belfast, Belfast, BT9 5AG UK

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Prof. Shuang Yang

Prof. Shuang Yang

Key Laboratory for Ultrafine Materials of Ministry of Education, School of Materials Science and Engineering, East China University of Science and Technology, 130 Meilong Road, Shanghai, 200237 China

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Prof. Hai Feng Wang

Corresponding Author

Prof. Hai Feng Wang

Key Laboratory for Advanced Materials, School of Chemistry and Molecular Engineering, East China University of Science and Technology, 130 Meilong Road, Shanghai, 200237 China

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Prof. Hua Gui Yang

Corresponding Author

Prof. Hua Gui Yang

Key Laboratory for Ultrafine Materials of Ministry of Education, School of Materials Science and Engineering, East China University of Science and Technology, 130 Meilong Road, Shanghai, 200237 China

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First published: 23 October 2021
Citations: 147

Graphical Abstract

A S-HKUST-1 precatalyst with stable isolated Cu−S motifs was prepared by the strategy of local sulfur doping. The precatalyst can be in situ reconstructed to obtain a Cu(S) matrix with active biphasic copper/copper sulfide interfaces, which delivers a current density of 400 mA cm−2 with Faradaic efficiency of ethylene to 57.2 % in the flow cell.

Abstract

Copper-based materials are efficient electrocatalysts for the conversion of CO2 to C2+ products, and most these materials are reconstructed in situ to regenerate active species. It is a challenge to precisely design precatalysts to obtain active sites for the CO2 reduction reaction (CO2RR). Herein, we develop a strategy based on local sulfur doping of a Cu-based metal–organic framework precatalyst, in which the stable Cu−S motif is dispersed in the framework of HKUST-1 (S-HKUST-1). The precatalyst exhibits a high ethylene selectivity in an H-type cell with a maximum faradaic efficiency (FE) of 60.0 %, and delivers a current density of 400 mA cm−2 with an ethylene FE up to 57.2 % in a flow cell. Operando X-ray absorption results demonstrate that Cuδ+ species stabilized by the Cu−S motif exist in S-HKUST-1 during CO2RR. Density functional theory calculations indicate the partially oxidized Cuδ+ at the Cu/CuxSy interface is favorable for coupling of the *CO intermediate due to the modest distance between coupling sites and optimized adsorption energy.

Conflict of interest

The authors declare no conflict of interest.

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