Evidence of the O–Pd–O and Pd–O4 structure units as oxide seeds and their origin on Pd(211): revealing the mechanism of surface oxide formation

2019 ◽  
Vol 21 (12) ◽  
pp. 6499-6505 ◽  
Author(s):  
Xiran Cheng ◽  
Ziyun Wang ◽  
Yu Mao ◽  
P. Hu
Keyword(s):  
Heterogeneous Catalysis ◽  
Metal Surfaces ◽  
Materials Science ◽  
Metal Catalysts ◽  
Surface Oxide ◽  
Oxidation Reactions ◽  
Oxide Formation ◽  
Surface Oxides ◽  
Surface Oxide Formation

The formation of surface oxides on metal surfaces is not only important in materials science, but also of significance in heterogeneous catalysis due to the fact that during most oxidation reactions the metal catalysts are inevitably oxidized, which may cause dramatic consequences in the reactions.

scholarly journals How the anisotropy of surface oxide formation influences the transient activity of a surface reaction

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
P. Winkler ◽  
J. Zeininger ◽  
Y. Suchorski ◽  
M. Stöger-Pollach ◽  
P. Zeller ◽  
...  
Keyword(s):  
Hydrogen Oxidation ◽  
Surface Oxidation ◽  
Surface Reactivity ◽  
Surface Oxide ◽  
Surface Structures ◽  
Oxide Formation ◽  
Reaction Fronts ◽  
Transient Activity ◽  
Surface Oxide Formation ◽  
Stepped Surface

AbstractScanning photoelectron microscopy (SPEM) and photoemission electron microscopy (PEEM) allow local surface analysis and visualising ongoing reactions on a µm-scale. These two spatio-temporal imaging methods are applied to polycrystalline Rh, representing a library of well-defined high-Miller-index surface structures. The combination of these techniques enables revealing the anisotropy of surface oxidation, as well as its effect on catalytic hydrogen oxidation. In the present work we observe, using locally-resolved SPEM, structure-sensitive surface oxide formation, which is summarised in an oxidation map and quantitatively explained by the novel step density (SDP) and step edge (SEP) parameters. In situ PEEM imaging of ongoing H2 oxidation allows a direct comparison of the local reactivity of metallic and oxidised Rh surfaces for the very same different stepped surface structures, demonstrating the effect of Rh surface oxides. Employing the velocity of propagating reaction fronts as indicator of surface reactivity, we observe a high transient activity of Rh surface oxide in H2 oxidation. The corresponding velocity map reveals the structure-dependence of such activity, representing a direct imaging of a structure-activity relation for plenty of well-defined surface structures within one sample.

Control of surface oxide formation in plasma-enhanced quasiatomic layer etching of tantalum nitride

2020 ◽  
Vol 38 (2) ◽  
pp. 022609 ◽  
Author(s):  
Nathan Marchack ◽  
Jon-l Innocent-Dolor ◽  
Marinus Hopstaken ◽  
Sebastian Engelmann
Keyword(s):  
Surface Oxide ◽  
Tantalum Nitride ◽  
Oxide Formation ◽  
Surface Oxide Formation

In SituInfrared Study of Surface Oxide Formation on Gas-Evaporated Si Microcrystals

1993 ◽  
Vol 32 (Part 1, No. 11A) ◽  
pp. 4870-4877 ◽  
Author(s):  
Shinji Hayashi ◽  
Satoshi Kawata ◽  
Han Min Kim ◽  
Keiichi Yamamoto
Keyword(s):  
Surface Oxide ◽  
Oxide Formation ◽  
Surface Oxide Formation
Sign in / Sign up

Export Citation Format

Share Document