Direct Observation of Hollow Bimetallic Nanoparticle Formation through Galvanic Replacement and Etching Reactions.
basic_science · Level V
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- Record sourced from PubMed, PMID 37988597.
- Also identified by DOI 10.1021/acs.nanolett.3c02575.
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Abstract
Hollow bimetallic nanoparticles (NPs) formed from metal oxide NP templates are widely used catalysts for hydrogen evolution and CO<sub>2</sub> reduction reactions. Despite their importance in catalysis, the details of how these NPs form on the NP templates remain unclear. Here, using <i>in situ</i> liquid-phase transmission electron microscopy (TEM) imaging, we describe the conversion of Cu<sub>2</sub>O template NPs to hollow PdCu NPs. Our observations show that a polycrystalline PdCu shell forms on the surface of the template via a galvanic replacement reaction while the template undergoes anisotropic etching. This study provides important insights into the synthesis of hollow metallic nanostructures from metal oxide templates.