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Coupling of morphological instability and kinetic instability: Chemical waves in hydrogen oxidation on a bimetallic Ni/Rh(111) surface

MPG-Autoren
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Prieto,  Mauricio
Chemical Physics, Fritz Haber Institute, Max Planck Society;
Interface Science, Fritz Haber Institute, Max Planck Society;

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Gottlob,  Daniel M.
Chemical Physics, Fritz Haber Institute, Max Planck Society;

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Tanase,  Liviu Cristian
Chemical Physics, Fritz Haber Institute, Max Planck Society;
Interface Science, Fritz Haber Institute, Max Planck Society;

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Schmidt,  Thomas
Chemical Physics, Fritz Haber Institute, Max Planck Society;
Interface Science, Fritz Haber Institute, Max Planck Society;

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PhysRevMaterials.5.045002.pdf
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Zitation

Homann, M., von Boehn, B., Prieto, M., Gottlob, D. M., Tanase, L. C., Schmidt, T., et al. (2021). Coupling of morphological instability and kinetic instability: Chemical waves in hydrogen oxidation on a bimetallic Ni/Rh(111) surface. Physical Review Materials, 5(4): 045002. doi:10.1103/PhysRevMaterials.5.045002.


Zitierlink: https://hdl.handle.net/21.11116/0000-0008-52E2-C
Zusammenfassung
The oxidation and reduction of a bimetallic Ni/Rh model catalyst during the water forming O2+H2 reaction is studied with low-energy electron microscopy, microspot-low-energy electron diffraction, and x-ray photoemission electron microscopy. Oxidation of a submonolayer Ni film results in the formation of three-dimensional (3D) NiO nanoparticles. Reduction of 3D-NiO in H2 produces a dispersed two-dimensional film of metallic Ni. Chemical waves during the O2+H2 reaction involve a cyclic transformation between 3D-NiO and 2D-NiO.