Journal
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
Volume 59, Issue 26, Pages 10574-10580Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.202001067
Keywords
multilayered core-shell nanostructures; shaped intermetallic nanoparticles; strain-enhanced metallic intermixing
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Funding
- NSF [CHE-1566445, ACI-1548562]
- NERSC, a USDOE Office of Science User Facility [DE-AC02-05CH11231]
- Ministry of Science and Technology, Taiwan [MOST 108-2628-M-001-005-MY3]
- Academia Sinica, Taiwan [AS-iMATE-109-22, AS-SS-108-02]
- US Department of Energy, Office of Science, Basic Energy Sciences, Division of Chemical, Sciences, Geosciences, and Biological Sciences
- [DE-AC02-07CH11338]
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Controlling the surface composition of shaped bimetallic nanoparticles could offer precise tunability of geometric and electronic surface structure for new nanocatalysts. To achieve this goal, a platform for studying the intermixing process in a shaped nanoparticle was designed, using multilayered Pd-Ni-Pt core-shell nanocubes as precursors. Under mild conditions, the intermixing between Ni and Pt could be tuned by changing layer thickness and number, triggering intermixing while preserving nanoparticle shape. Intermixing of the two metals is monitored using transmission electron microscopy. The surface structure evolution is characterized using electrochemical methanol oxidation. DFT calculations suggest that the low-temperature mixing is enhanced by shorter diffusion lengths and strain introduced by the layered structure. The platform and insights presented are an advance toward the realization of shape-controlled multimetallic nanoparticles tailored to each potential application.
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