Abstract
Ordered heterostructured nanocrystals with large compositional and morphological diversity are important for many applications. However, design of multicomponent nanostructures at the atomic level is difficult due to the elusive nucleation and growth processes in a solution-phase environment. Here we report a modular synthetic protocol that produces ordered multilayered nanostructures with small particle size by layer-by-layer growth. We introduce a selenium capping agent to hinder self-assembly, aggregation and phase segregation of nanostructures, while also sequencing the priority of metal atoms that migrate in the substrate lattice according to different metal–selenium bonding strengths, leading to a layer-by-layer growth for ordered nanostructures. The multilayered multicomponent nanocrystals are demonstrated in an alkaline polymer electrolyte fuel cell by using PtRuZn-SKE (SKE, selenium-mediated Kirkendall effect) as the anodic hydrogen oxidation reaction catalyst, which can deliver a high peak power density of 1.52 W cm−2 in H2–O2 and 1.12 W cm−2 in H2–air (CO2-free) while operating at 600 mA cm−2 for 100 h. This generalizable strategy provides a predictable synthetic pathway to complex nanocrystals.

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Additional characterization data, experimental data, and theoretical calculation data are provided in the Supplementary Information. Source data are provided with this paper.
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The computational codes used in this work are available within the commercial VASP and the Gaussian 09 packages.
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Acknowledgements
X.H. acknowledges support from the National Key R&D Program of China (2020YFB1505802), the Ministry of Science and Technology (2017YFA0208200), the National Natural Science Foundation of China (22025108, U21A20327, 22121001) and start-up fundings from Xiamen University. J.H. acknowledges support from the National Natural Science Foundation of China (52272256). C.H. acknowledges support from the Postdoctoral Science Foundation of China (2021M702731). J.X. acknowledges the grants from the Research Grants Council of the Hong Kong Special Administrative Region, China (grant number 21301324).
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X.H. supervised the project. C.H. carried out the materials synthesis, electrochemical experiments, electron microscopy experiments, data processing and analysis, and manuscript writing. J.H. performed the DFT calculations. J.X. revised the manuscript. Y.T. Y.T. contacted the spherical aberration transmission electron microscopy testing cooperation. Y.Z. and S.Z. performed the spherical aberration transmission electron microscopy experiments. R.R. and L.Z. conducted the membrane electrode assembly measurements. Q.K. and Z.H. performed the XAS measurements. L.L. analysed the XAS data. All authors discussed and commented on the manuscript.
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Nature Synthesis thanks Hao Jing, J. R. Sambrano and the other, anonymous, reviewer(s) for their contribution to the peer review of this work. Primary Handling Editor: Alexandra Groves, in collaboration with the Nature Synthesis team.
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Hu, C., Zhang, Y., Ren, R. et al. A selenium-mediated layer-by-layer synthetic strategy for multilayered multicomponent nanocrystals. Nat. Synth 3, 1299–1309 (2024). https://doi.org/10.1038/s44160-024-00598-2
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DOI: https://doi.org/10.1038/s44160-024-00598-2
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