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High current CO2 reduction realized by edge/defect-rich bismuth nanosheets

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Abstract

CO2 electroreduction has been regarded as an appealing strategy for renewable energy storage. Recently, bismuth (Bi) electrocatalysts have attracted much attention due to their excellent formate selectivity. However, many reported Bi electrocatalysts suffer from low current densities, which are insufficient for industrial applications. To reach the goal of high current CO2 reduction to formate, we fabricate Bi nanosheets (NS) with high activity through edge/terrace control and defect engineering strategy. Bi NS with preferential exposure sites are obtained by topotactic transformation, and the processes are clearly monitored by in-situ Raman and ex-situ X-ray diffraction (XRD). Bi NS-1 with a high fraction of edge sites and defect sites exhibits excellent performance, and the current density is up to ca. 870 mA·cm−2 in the flow cell, far above the industrially applicable level (100 mA·cm−2), with a formate Faradaic efficiency greater than 90%. In-situ Fourier transform infrared (FT-IR) spectra detect *OCHO, and theoretical calculations reveal that the formation energy of *OCHO on edges is lower than that on terraces, while the defects on edges further reduce the free energy changes (ΔG). The differential charge density spatial distributions reveal that the presence of defects on edges causes charge enrichment around the C-H bond, benefiting the stabilization of the *OCHO intermediate, thus remarkably lowering the ΔG.

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Acknowledgements

This work was financially supported by the National Natural Science Foundation of China (Nos. 22105133 and 22101191), China Postdoctoral Science Foundation (Nos. BX20190222, 2019M663490, and 2021M692261), the Fundamental Research Funds for the Central Universities (Nos. 20826041E4211, 20826041E4258, 20826041E4212, 2021SCU12150 and 2021SCU12151), the China Scholarship Council, and Sichuan Science and Technology Program (No. 2021YJ0405). We thank Ms. Yue Qi of the Comprehensive Training Platform of the Specialized Laboratory in the College of Chemistry at Sichuan University, Dr. Daibing Luo and Dr. Daichuan Ma from the Analytical & Testing Center of Sichuan University for X-ray diffraction work. National Supercomputing Center in Shenzhen is acknowledged for computational support.

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  1. Key Laboratory of Green Chemistry & Technology of Ministry of Education, College of Chemistry, Sichuan University, Chengdu, 610064, China

    Jiaqi Xu, Siheng Yang, Wei Zhang, Xueli Zheng, Haiyan Fu, Maolin Yuan, Hua Chen & Ruixiang Li

  2. Sichuan Research Institute of Chemical Quality and Safety Testing, Chengdu, 610031, China

    Li Ji

  3. Sichuan Institute of Product Quality Supervision and Inspection, Chengdu, 610100, China

    Jiawei Mao

  4. Key Laboratory of Advanced Materials Technologies, College of Materials Science and Engineering, Fuzhou University, Fuzhou, 350108, China

    Chengkai Yang

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  1. Jiaqi Xu
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Xu, J., Yang, S., Ji, L. et al. High current CO2 reduction realized by edge/defect-rich bismuth nanosheets. Nano Res. 16, 53–61 (2023). https://doi.org/10.1007/s12274-022-4770-z

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