%0 Journal Article
%A Gleissner, Robert
%A Chung, Simon
%A Dalla Lana Semione, Guilherme
%A Jacobse, Leon
%A Wagstaffe, Michael
%A Tober, Steffen
%A Neumann, Anika Joanne
%A Gizer, Goekhan
%A Goodwin, Christopher
%A Soldemo, Markus
%A Shipilin, Mikhail
%A Loemker, Patrick
%A Schlueter, Christoph
%A Gutowski, Olof
%A Muntwiler, Matthias
%A Amann, Peter
%A Noei, Heshmat
%A Vonk, Vedran
%A Stierle, Andreas
%T Role of Oxidation–Reduction Dynamics in the Application of Cu/ZnO-Based Catalysts
%J ACS applied nano materials
%V 6
%N 9
%@ 2574-0970
%C Washington, DC
%I ACS Publications
%M PUBDB-2023-01346
%P 8004 - 8016
%D 2023
%X 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<sub>2</sub>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―14) surface, the nanoparticles undergo a coherent tilt. We find thatthe oxidation process is fully reversible under H<sub>2</sub> 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<sub>2</sub> 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.
%F PUB:(DE-HGF)16
%9 Journal Article
%U <Go to ISI:>//WOS:000985512600001
%R 10.1021/acsanm.3c01306
%U https://bib-pubdb1.desy.de/record/580644