Oxidation at the sub-nanoscale: oxygen adsorption on graphene-supported size-selected Ag clusters

Federico Loi, Monica Pozzo, Luca Sbuelz, Luca Bignardi, Paolo Lacovig, Ezequiel Tosi, Silvano Lizzit, Aras Kartouzian, Ueli Heiz, Dario Alfè, Alessandro Baraldi

Research output: Contribution to journalArticlepeer-review

3 Scopus citations


The evolution of the aggregation of condensed matter from single atoms to three-dimensional structures represents an important topic in nanoscience, since it contains essential information to achieve tailor-made growth of nanostructured materials. Such an issue is particularly important in the case of the formation of nano-oxides, which have strong potentialities in heterogeneous catalysis reactions. Herein, we show that a low-nuclearity graphene supported Ag cluster (formed by 11 atoms) shows a local AgO4 configuration, spatial charge distribution and two oxidation states that are similar to those of bulk AgO. This result indicates that bulk oxide conformations can start to develop already for extremely small atomic aggregates (<1 nm), differently from metallic clusters. This local conformation shows the lowest oxygen vacancy formation energy, which affords high efficiency in the ethylene epoxidation reaction with Ag and strongly supports the possibility of incorporating sub-nanometric clusters in important catalytic reactions.

Original languageEnglish
Pages (from-to)14594-14603
Number of pages10
JournalJournal of Materials Chemistry A
Issue number27
StatePublished - 17 Jun 2022
Externally publishedYes


Dive into the research topics of 'Oxidation at the sub-nanoscale: oxygen adsorption on graphene-supported size-selected Ag clusters'. Together they form a unique fingerprint.

Cite this