Fritz-Haber-Institut der Max-Planck-Gesellschaft  

Inorganic Chemistry – Electronic Structure Group
  

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Electronic Structure:
Axel Knop-Gericke
 
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Surface science offers methods for the characterization of almost everything catalysis research could be interested in: Surface composition, morphology, atomic structure, electronic structure, energetics and kinetics of adsorption and desorption. Unfortunately, almost all methods need low pressures and can conventionally not be applied in-situ under the pressure conditions of a realistic reaction experiment. Many examples show, however, that catalyst surfaces are modified under reaction conditions in a functionally important way. Therefore, three approaches have been developed here to apply surface science methods in-situ or quasi-in-situ:
  • Soft X-ray absorption spectroscopy (SXAS) using synchrotron radiation during reaction in the 1-10 mbar range with separation of gas-phase and surface contributions,
  • X-ray photoelectron spectroscopy (XPS) using synchrotron radiation during reaction in the mbar range with differential pumping of the analyser and a
  • X-ray photoelectron spectroscopy (XPS) using synchrotron radiation of an electrode during an electro-chemical reaction in presence of a liquid electrolyte.
Apart from these setups, a large number of surface science methods are available for preparation and ex-situ characterization of both single crystalline and polycrystalline or powder samples. All setups are equipped with load-lock systems for quick sample exchange. Conventional XPS is offered as general service for other groups in the department and for cooperation partners.
These approaches and methods were applied in the following projects.

Electro-chemical cell for investigations
of the electronic structure of solid-liquid
interfaces relevant for electro-chemical
processes.

(to see full size, click on the image)
Reactants induced dynamic responses of heterogeneous catalysts
S. Wrabetz, Th. Lunkenbein, V. Pfeifer, P. Kube, K. Mette, T. Jones, A. Knop-Gericke, A. Trunschke, R. Schlögl
Read more about this project  ... ››
 
Electronic structure of Mn based catalysts for the OER (Mn-Project)
K. Skorupska, T. Jones, J. Ohms, P. Kurz, J. Velasco-Velez, Ch.-H. Chuang, A. Knop-Gericke, R. Schlögl
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Turning the pressure up in soft X-ray photoelectron spectroscopy
J. Velasco-Vélez, V. Pfeifer, M. Hävecker, E. Stotz, K. Skorupska, D. Teschner, R. Schlögl, A. Knop-Gericke
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In-situ XPS study of selective oxidation of ethylene on Re and Ag-Re catalysts
A. Klyushin, T. Jones, M.T. Greiner, E. Carbonio, M. Hävecker, E. Frei, M. Lamoth, E. Willinger, A. Knop-Gericke, R. Schlögl
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CNT functionalization characterized by XPS, TDS and TG-MS
R. Blume, P. Düngen, S. Heumann, R. Schlögl
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Nanostructured mixed metal oxides for the electrocatalytic oxidation of water (SPP 1613 with AG Strasser, TU-Berlin)
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Identifying oxygen adatoms on unreconstructed Ag(110) with NAP-XPS
E. Carbonio, T. Jones, T.C.R. Rocha, A. Klyushin, I. Píš, E. Magnano, S. Nappini, S. Piccining, A. Knop-Gericke, R. Schlögl
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Sulfur in Ethylene Epoxidation on Silver
T. Jones, E. Carbonio, M. Greiner, A. Klyushin, R. Wyrwich, S. Böcklein, S. Günther, W. Moritz, J. Wintterlin, S. Piccinin, A. Knop-Gericke, R. Schlögl
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EMIL: Bridging the “pressure gap” in electron spectroscopy
M. Hävecker, E. Stotz, M. Gorgoi, St. Hendel, F. Schäfers, K. Lips, S. Raoux, A. Knop-Gericke, R. Schlögl
Read more about this project  ... ››
 
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Address: Fritz-Haber-Institut der Max-Planck-Gesellschaft, Faradayweg 4-6, 14195 Berlin, Germany    
Abteilung Anorganische Chemie - Direktor Prof. Dr. Robert Schlögl    
Tel: +49 30 8413 4404, Fax: +49 30 8413 4401, E-Mail: acsek@fhi-berlin.mpg.de