Revealing the Surface Energetics and Reactivity of Bimetallic Copper-Gold Catalyst Nanoparticles by In Situ Environmental TEM

Jaysen Nelayah, Adrian Chmielewski, Damien Alloyeau, Hakim Amara, Jérôme Creuze, Christian Ricolleau, 2019
Atmosphere in situ TEM holder and manifold
Image courtesy of Microscopy and Microanalysis

Abstract

Supported bimetallic copper-gold nanoparticles (NPs) are of interest to heterogeneous catalysis as they often perform better than their monometallic counterparts in many oxidizing and reducing reactions. If the effects of the metal alloying on the catalytic performances of Cu-Au NPs are undeniable, the origin of these effects is still largely unknown. This stems from the lack of direct observations of the NPs in their reaction environments, i.e., at high temperature and high pressure. In this contribution, we will present in situ studies of the morphological and chemical transformations of Au, Cu and Cu-Au nanoparticles at elevated temperature both in vacuum and under O2 and H2 atmospheres using windowed-cell environmental transmission electron microscope (ETEM).

Impact Statement

The authors presents an situ studies of the morphological and chemical transformations of Au, Cu and Cu-Au nanoparticles at elevated temperature both in vacuum and under O2 and H2 atmospheres using the Atmosphere system. This study will help to understand the performence difference between heterogeneous catalysts and their monometallic counterparts.