A5055595317- Catalytic Processes in Materials Science
- Copper-based nanomaterials and applications
- Electrocatalysts for Energy Conversion
- Catalysis and Oxidation Reactions
- Electronic and Structural Properties of Oxides
- Advanced Nanomaterials in Catalysis
Charles University
2015-2022
Abstract Single-atom catalysts maximize the utilization of supported precious metals by exposing every single metal atom to reactants. To avoid sintering and deactivation at realistic reaction conditions, atoms are stabilized specific adsorption sites on catalyst substrates. Here we show combining photoelectron spectroscopy, scanning tunnelling microscopy density functional theory calculations that Pt ceria most ubiquitous defects solid surfaces—monoatomic step edges. segregation steps leads...
Reactions of reduced cerium oxide CeOx with water are fundamental processes omnipresent in ceria-based catalysis. Using thin epitaxial films ordered CeOx, we investigate the influence oxygen vacancy concentration and coordination on oxidation by water. Upon changing stoichiometry from CeO2 to Ce2O3, observe a transition slow surface reaction productive H2-evolving yields exceeding capacity indicating participation bulk OH species. Both experiments ab initio calculations associate effective...
Single-atom catalysts represent an essential and ever-growing family of heterogeneous catalysts. Recent studies indicate that besides the valuable catalytic properties provided by single-atom active sites, presence sites on catalyst substrates may significantly influence population supported metal nanoparticles coexisting with single atoms. Treatment ceria-based in oxidizing or reducing atmospheres was proven to provide a precise experimental control size Pt and, correspondingly, activity...
Smallest metallic (blue) and ionic (grey) Pt objects on ceria are shaped controlled by surface oxygen content.
Single-atom catalysts represent an essential and ever-growing family of heterogeneous catalysts. Recent studies indicate that besides the valuable catalytic properties provided by single-atom active sites, presence sites on catalyst substrates may significantly influence population supported metal nanoparticles coexisting with single atoms. Treatment ceria-based in oxidizing or reducing atmospheres was proven to provide precise experimental control size Pt nanoparticles, and,...