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Tuning the reaction path of CO2 electroreduction reaction on indium single-atom catalyst: Insights into the active sites

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Abstract

Modulating the local coordination structure of metal single-atom catalysts (SACs) is extensively employed to tune the catalytic activity, but rarely involved in regulating the reaction pathway which fundamentally determines the product selectivity. Herein, we report that the product selectivity of electrochemical CO2 reduction (CO2RR) on the single-atom indium-NxC4−x (1 ≤ x ≤ 4) catalysts could be tuned from formate to CO by varying the carbon and nitrogen occupations in the first coordination sphere. Surprisingly, the optimal In SAC showed great promise for CO production with the maximum Faradic efficiency of 97%, greatly different from the reported In-based catalysts where the formate is the dominant product. Combined experimental verifications and theoretical simulations reveal that the selectivity switch from formate to CO on In SACs originates from active sites shift from indium center to the indium-adjacent carbon atom, where the indium site favors formate formation and the indium-adjacent carbon site prefers the CO pathway. The present work suggests the active sites in metal SACs may shift from the widely accepted metal center to surrounding carbon atoms, thereby offering a new implication to revisit the active sites for metal SACs.

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Acknowledgements

This work was supported by the National Natural Science Foundation of China (Nos. 21905089, 2021RC3065, and 2021RC2053), the National Key Research and Development Program of China (No. 2021YFA1502000), the Science and Technology Innovation Program of Hunan Province (Nos. 2021RC3065 and 2021RC2053), Hunan Provincial Natural Science Foundation of China (No. 2020JJ2001), Shenzhen Science and Technology Program (No. JCYJ20210324120800002), and the Hefei National Laboratory for Physical Sciences at the Microscale (No. KF2020108). The calculations were performed on the supercomputing center of the University of Science and Technology of China (USTC-SCC) and Guangzhou-SCC.

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  1. Jiawei Zhang, Gangming Zeng, and Lanlan Chen contributed equally to this work.

Authors and Affiliations

  1. College of Materials Science and Engineering, Advanced Catalytic Engineer Research Center of the Ministry of Education, Hunan University, Changsha, 410082, China

    Jiawei Zhang, Gangming Zeng, Wenchuan Lai, Yuliang Yuan, Chao Ma & Hongwen Huang

  2. Hefei National Laboratory for Physical Sciences at the Microscale, Key Laboratory of Strongly-Coupled Quantum Matter Physics of Chinese Academy of Sciences, Department of Chemical Physics, University of Science and Technology of China, Hefei, 230026, China

    Lanlan Chen & Wenhua Zhang

  3. State Key Lab of Silicon Materials, School of Materials Science and Engineering, Zhejiang University, Hangzhou, 310027, China

    Yangfan Lu

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  1. Jiawei Zhang
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Tuning the reaction path of CO2 electroreduction reaction on indium single-atom catalyst: Insights into the active sites

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Zhang, J., Zeng, G., Chen, L. et al. Tuning the reaction path of CO2 electroreduction reaction on indium single-atom catalyst: Insights into the active sites. Nano Res. 15, 4014–4022 (2022). https://doi.org/10.1007/s12274-022-4177-x

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