posted on 2023-11-21, 20:11authored byWenhui Wang, Ivan Erofeev, Ya He, Fangqi Yang, Hongwei Yan, Jiong Lu, Utkur Mirsaidov
Hollow bimetallic nanoparticles (NPs)
formed from metal
oxide NP
templates are widely used catalysts for hydrogen evolution and CO2 reduction reactions. Despite their importance in catalysis,
the details of how these NPs form on the NP templates remain unclear.
Here, using in situ liquid-phase transmission electron
microscopy (TEM) imaging, we describe the conversion of Cu2O 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.