guest ::
| Home > Publications database > Role of Oxidation–Reduction Dynamics in the Application of Cu/ZnO-Based Catalysts |
| Home > Publications database > Role of Oxidation–Reduction Dynamics in the Application of Cu/ZnO-Based Catalysts |
| Journal Article | PUBDB-2023-01346 |
; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ; ;
2023
ACS Publications
Washington, DC
This record in other databases: 
Please use a persistent id in citations: doi:10.1021/acsanm.3c01306 doi:10.3204/PUBDB-2023-01346
Abstract: We investigated Cu nanoparticles (NPs) on vicinal and basal ZnO supports to obtain anatomistic picture of the catalyst’s structure under in situ oxidizing and reducing conditions.The Cu/ZnO model catalysts were investigated at elevated gas pressures by highenergy grazing incidence X-ray diffraction and ambient pressure X-ray photoelectronspectroscopy (AP-XPS). We find that the Cu nanoparticles are fully oxidized to Cu$_2$Ounder atmospheric conditions at room temperature. As the nanoparticles swell duringoxidation, they maintain their epitaxy on basal ZnO (000±1) surfaces, whereas on thevicinal ZnO (10$\bar{14}$) surface, the nanoparticles undergo a coherent tilt. We find thatthe oxidation process is fully reversible under H$_2$ flow at 500 K, resulting in predominantlywell-aligned nanoparticles on the basal surfaces, whereas the orientation of CuNPs on vicinal ZnO was only partially restored. The analysis of the substrate crystaltruncation rods evidences the stability of basal ZnO surfaces under all gas conditions.No Cu-Zn bulk alloy formation is observed. Under CO$_2$ flow, no diffraction signalfrom the nanoparticles is detected, pointing to their completely disordered state. TheAP-XPS results are in line with the formation of CuO. Scanning electron microscopyimages show that massive mass transport has set in, leading to the formation of largeragglomerates.
; 
; 
; Clarivate Analytics Master Journal List ; Current Contents - Engineering, Computing and Technology ; Current Contents - Physical, Chemical and Earth Sciences ; IF >= 5 ; JCR ; SCOPUS ; Web of Science Core Collection
|
The record appears in these collections: |
PDF
PDF (PDFA)