Abstract
Noble-metal nanocrystals with structural features such as high-index facets and twin defects on the surface are desirable for various catalytic applications. Here we report an aqueous route to the facile synthesis of Pd–M (M = Pd, Pt, and Au) decahedra covered with concave facets by controlling the deposition and diffusion of M atoms on Pd decahedral seeds. Our mechanistic studies indicate that the preferential deposition of M atoms on the twin boundaries of Pd decahedral seeds under limited surface diffusion is instrumental to their evolution into decahedra enclosed by concave facets. Due to the presence of high-index facets and twin boundaries on the surface, the Pd concave decahedra show enhanced catalytic activity towards formic acid oxidation. The present work not only offers a general route to the facile synthesis of decahedral nanocrystals with concave facets but also provides an additional knob for enhancing the catalytic performance of noble-metal nanocrystals.
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Acknowledgements
This work was supported in part by a research grant from the NSF (CHE1804970) and startup funds from Georgia Institute of Technology. As a visiting Ph.D. student from Zhejiang University, H. Huang was also partially supported by a Fellowship from the China Scholarship Council.
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Huang, H., Chen, R., Liu, M. et al. Aqueous Synthesis of Pd–M (M = Pd, Pt, and Au) Decahedra with Concave Facets for Catalytic Applications. Top Catal 63, 664–672 (2020). https://doi.org/10.1007/s11244-020-01235-w
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DOI: https://doi.org/10.1007/s11244-020-01235-w