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, we design a platform for studying the intermixing process in a shaped nanoparticle, using multilayered Pd-Ni-Pt core-shell nanocubes as precursors. We find that, 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 strain introduced by the layered structure. The platform and insights presented here represent an advance toward the realization of shape-controlled multimetallic nanoparticles tailored to each potential application.

Strain-driven metallic intermixing in shape-controlled multilayered core-shell nanostructures: Toward shaped intermetallics

Macromolecular Chemistry: The Second Century

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ACS Spring 2020 National Meeting & Expo

The official archive and repository for all ACS Meetings & Expositions abstracts and select posters or presentations.