Synthesis of small Ni-core-Au-shell catalytic nanoparticles on TiO₂ by galvanic replacement reaction.

ABSTRACT: We report the first preparation of small gold-nickel (AuNi) bimetallic nanoparticles (<5 nm) supported on titania by the method of galvanic replacement reaction (GRR), evidenced by the replacement of Ni atoms by Au atoms according to the stoichiometry of the reaction. We showed that this preparation method allowed not only the control of the gold and nickel contents in the samples, but also the formation of small bimetallic nanoparticles with strained core-shell structures, as revealed by aberration-corrected scanning transmission electron microscopy in combination with energy-dispersive X-ray spectroscopy mapping. The catalytic characterization by the probe reaction of semi-hydrogenation of butadiene showed that the resulting nickel-based nanocatalysts containing a small amount of gold ex

SUBMITTER: Reboul J 

PROVIDER: S-EPMC9418773 | biostudies-literature | 2021 Feb

REPOSITORIES: biostudies-literature