The influence of metallic and oxide phases coexisting on surfaces is of fundamental importance in heterogeneous catalysis. Many reactions lead to the reduction of the oxidized areas, but the elucidation of the mechanisms driving these processes is often challenging. In addition, intermediate species or designed organic ligands increase the complexity of the surface. In the present study, we address the thermal reduction of a copper oxide overlayer grown on Cu(111) in the presence of N-heterocyclic carbene (NHC) ligands by means of scanning tunneling microscopy (STM) and density functional theory (DFT). We show that the NHC ligands actively participate in the copper oxide reduction, promoting its removal at temperatures as low as 470 K. The reduction of the oxide was tracked by employing scanning tunneling spectroscopy (STS), providing a chemical identification of metallic and oxide areas at the nanometric scale.

Navarro, J., Das, M., Tosoni, S., Landwehr, F., Heyde, M., Pacchioni, G., et al. (2022). Promoted Thermal Reduction of Copper Oxide Surfaces by N-Heterocyclic Carbenes. JOURNAL OF PHYSICAL CHEMISTRY. C, 126(41), 17528-17535 [10.1021/acs.jpcc.2c04257].

Promoted Thermal Reduction of Copper Oxide Surfaces by N-Heterocyclic Carbenes

Tosoni S.
;
Pacchioni G.;
2022

Abstract

The influence of metallic and oxide phases coexisting on surfaces is of fundamental importance in heterogeneous catalysis. Many reactions lead to the reduction of the oxidized areas, but the elucidation of the mechanisms driving these processes is often challenging. In addition, intermediate species or designed organic ligands increase the complexity of the surface. In the present study, we address the thermal reduction of a copper oxide overlayer grown on Cu(111) in the presence of N-heterocyclic carbene (NHC) ligands by means of scanning tunneling microscopy (STM) and density functional theory (DFT). We show that the NHC ligands actively participate in the copper oxide reduction, promoting its removal at temperatures as low as 470 K. The reduction of the oxide was tracked by employing scanning tunneling spectroscopy (STS), providing a chemical identification of metallic and oxide areas at the nanometric scale.
Articolo in rivista - Articolo scientifico
Layers, Ligands, Molecules, Oxides, Scanning tunneling microscopy
English
6-ott-2022
2022
126
41
17528
17535
none
Navarro, J., Das, M., Tosoni, S., Landwehr, F., Heyde, M., Pacchioni, G., et al. (2022). Promoted Thermal Reduction of Copper Oxide Surfaces by N-Heterocyclic Carbenes. JOURNAL OF PHYSICAL CHEMISTRY. C, 126(41), 17528-17535 [10.1021/acs.jpcc.2c04257].
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/10281/396371
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