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375 results on '"Kuhlenbeck, H."'

4. Adatom Bonding Sites in a Nickel-Fe3O4(001) Single-Atom Model Catalyst and O2 Reactivity Unveiled by Surface Action Spectroscopy with Infrared Free-Electron Laser Light

Author

Liu, Y., Han, Z., Gewinner, S., Schöllkopf, W., Levchenko, S., Kuhlenbeck, H., and Roldan Cuenya, B.

Abstract

Single-atom (SA) catalysis presently receives much attention with its promise to decrease the cost of the active material while increasing the catalyst’s performance. However, key details such as the exact location of SA species and their stability are often unclear due to a lack of atomic level information. Here, we show how vibrational spectra measured with surface action spectroscopy (SAS) and density functional theory (DFT) simulations can differentiate between different adatom binding sites and determine the location of Ni and Au single atoms on Fe3O4. We reveal that Ni and Au adatoms selectively bind to surface oxygen ions which are octahedrally coordinated to Fe ions. In addition, we find that the Ni adatoms can activate O2 to superoxide in contrast to the bare surface and Ni in subsurface positions. Overall, we unveil the advantages of combining SAS and DFT for improving the understanding of single-atom catalysts.

Published
2022

6. Molecules on Clean and Modified Oxide Surfaces

Author

Freund, H.-J., Klüner, T., Wichtendahl, R., Thiel, S., Adelt, M., Drachsel, W., Bäumer, M., Kuhlenbeck, H., Risse, T., Al-Shamery, K., Kampling, M., Hamann, H., Russo, Nino, editor, and Salahub, Dennis R., editor

Published
2000
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7. Concept and Design of the SMART Spectromicroscope at BESSY II

Author

Engel, W., Degenhardt, R., Bradshaw, A. M., Erlebach, W., Ihmann, K., Kuhlenbeck, H., Wichtendahl, R., Freund, H.-J., Schlögl, R., Preikszas, D., Rose, H., Spehr, R., Hartel, P., Lilienkamp, G., Schmidt, Th., Bauer, E., Benner, G., Fink, R., Weiss, M. R., Umbach, E., Thieme, Jürgen, editor, Schmahl, Günter, editor, Rudolph, Dietbert, editor, and Umbach, Eberhard, editor

Published
1998
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8. Electronic Excitations at Oxide Surfaces

Author

Kuhlenbeck, H., Bäumer, M., Bender, M., Cappus, D., Dillmann, B., Ehrlich, D., Rohr, F., Schönnenbeck, M., Seiferth, O., Freund, H.-J., Cardona, Manuel, editor, Fulde, Peter, editor, von Klitzing, Klaus, editor, Queisser, Hans-Joachim, editor, Lotsch, Helmut K. V., editor, Okiji, Ayao, editor, Kasai, Hideaki, editor, and Makoshi, Kenji, editor

Published
1996
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15. Adsorption and UV-Laser Desorption of NO/O/Ni(100)

Author

Mull, Th., Kuhlenbeck, H., Odörfer, G., Jaeger, R., Xu, C., Baumeister, B., Menges, M., Illing, G., Freund, H.-J., Weide, D., Andresen, P., Ertl, Gerhard, editor, Gomer, Robert, editor, Lotsch, Helmut K. V., editor, Betz, Gerhard, editor, and Varga, Peter, editor

Published
1990
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16. Surface Action Spectroscopy : A review and a Perspective on a New Technique to Study Vibrations at Surfaces

Author

Liu, Y., Wu, Zongfang, Kuhlenbeck, H., Freund, H. -J, Liu, Y., Wu, Zongfang, Kuhlenbeck, H., and Freund, H. -J

Abstract

A new vibrational spectroscopy method aimed at the investigation of solid surfaces in ultrahigh vacuum, called “Surface Action Spectroscopy (SAS)”, is described and the first results are reviewed. This technique is based on ideas and experiments performed in the gas phase. A surface is exposed to a messenger species at low temperature. This messenger species is desorbed via absorption of tunable infrared light from a free-electron laser and the desorption rate of the messenger species is recorded via mass spectrometry. It is shown that the technique is extremely surface sensitive and we discuss the basic mechanisms of the technique. We show a feasibility study on a V2O3(0001) surface, where we know the surface structure. We then proceed to the example of iron oxide films to study the surface structure in parallel with calculations of the surface phonons, which allow us to confirm the surface structure of Fe3O4(111) to be Fetet terminated. It also provides evidence for the so-called biphase structure. To conclude, we discuss possibilities to apply the technique to interesting questions in model and real catalysis, since the technique may provide interesting information independent of long-range order of the sample., QC 20210219

Published
2021
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28. Palladium deposits on a single crystalline Cr2O3(0001) surface

Author

Wolter, K., Kuhlenbeck, H., and Freund, H.-J.

Subjects
Chromium compounds -- Chemical properties, Infrared spectroscopy -- Usage, Palladium -- Chemical properties, Chemicals, plastics and rubber industries
Abstract

Palladium deposits on a single crystalline Cr2O3(0001) film grown on Cr(110) are studied under ultrahigh vacuum conditions. The growth mode of two different temperatures (90 and 300 K) was investigated using infrared reflection absorption spectroscopy of the probe molecule CO.

Published
2002

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