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Direct transformation of bulk copper into copper single sites via emitting and trapping of atoms

Abstract

Single-atom catalysts exhibit intriguing properties and receive widespread interest for their effectiveness in promoting a variety of catalytic reactions, making them highly desired motifs in materials science. However, common approaches to the synthesis of these materials often require tedious procedures and lack appropriate interactions between the metal atoms and supports. Here, we report a simple and practical strategy to access the large-scale synthesis of single-atom catalysts via direct atoms emitting from bulk metals, and the subsequent trapping on nitrogen-rich porous carbon with the assistance of ammonia. First, the ammonia coordinates with the copper atoms to form volatile Cu(NH3)x species based on the strong Lewis acid–base interaction. Then, following transportation under an ammonia atmosphere, the Cu(NH3)x species are trapped by the defects on the nitrogen-rich carbon support, forming the isolated copper sites. This strategy is readily scalable and has been confirmed as feasible for producing functional single-atom catalysts at industrial levels.

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Fig. 1: Schematic of the preparation of Cu-SAs/N-C.
Fig. 2: Characterization of copper SACs and pyrolysed ZIF-8.
Fig. 3: Chemical state and coordination information for copper SACs.
Fig. 4: ORR activity of Cu-SAs/N-C and its large-scale production.
Fig. 5: Characterization of Ni/Co-SAs/N-C.

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The main data supporting the findings of this study are available within the article and its Supplementary Information. Extra data are available from the corresponding authors upon request.

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Acknowledgements

This work was supported by the National Key R&D Program of China 2017YFA (0208300) and National Natural Science Foundation of China (21522107, 21671180, 21521091, 21390393 and U1463202). We thank the photoemission endstations beamline 1W1B station in the Beijing Synchrotron Radiation Facility (BSRF), BL14W1 at the Shanghai Synchrotron Radiation Facility and BL10B and BL11U at the National Synchrotron Radiation Laboratory for help with the characterizations.

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Contributions

Y.Li and Y.W. conceived the idea and co-wrote the paper. Y.Q. carried out the sample synthesis, characterization and ORR measurement. Z.L., Z.Z., Z.Y., C.Z., T.Y., X.W., F.Z., C.Z. and J.W. helped with the modification of the paper. W.C. helped with the XAFS measurements and discussion. Y.Lin helped with the spherical aberration electron microscopy tests and discussion. All authors contributed to the overall scientific interpretation and edited the manuscript.

Corresponding authors

Correspondence to Yuen Wu or Yadong Li.

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Supplementary Figures 1–27 & Supplementary Tables 1–3

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Qu, Y., Li, Z., Chen, W. et al. Direct transformation of bulk copper into copper single sites via emitting and trapping of atoms. Nat Catal 1, 781–786 (2018). https://doi.org/10.1038/s41929-018-0146-x

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