11 Surface Characterization of Plasma-Electrolytic Oxidized Coatings by X-Ray. . .
421
Comparing to the “mono” coatings (containing either nickel or copper), there is
a larger amount of phosphorus, less amount of oxygen, significantly less nickel
and copper in mixed Ni-, Cu-containing coatings (see Fig. 11.1). According to
the binding energies (see Table 11.1), the states of the elements in “mono” and
in mixed coatings are similar. Also, as for “mono” coatings, for the mixed ones,
the concentration of copper in the upper surface layers of the coatings is noted, and
nickel is in the deeper layers; an increase in the nickel amount and a decrease in the
copper amount in the entire analyzed thickness (about 5 nm) under heating during
the catalytic process were found [5].
11.3 Outlook
For deeper understanding of our experimental results, quantum chemical calculation
based on density functional theory (DFT) can be applicable [9]. We are investigating
catalytic reactions (including the adsorption of carbon monoxide) of the surface
metal oxides in case of aluminum (III), nickel(II), and copper(II) oxide clusters.
The results of DFT calculations will be summarized in a similar manner after some
refinements.
Acknowledgments This work was supported in part by the Russian Ministry of Education and
Science (state task 3.6478.2017/6.7)
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