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Over, Herbert

Surface Chemistry and Model Catalysis

We use surface chemical methods and techniques to study the molecular processes encountered in heterogeneously catalyzed reaction, such as the HCl oxidation over RuO2-based and CeO2 based materials. Together with working group of Bernd Smarsly we develop shape-controlled nano-particles of CeO2 and hydrous RuO2 model catalysts. Here stability and activity test of these catalysts for corrosive reactions are conducted to learn more about the underlying microscopic processes. Complemented are these studies with kinetic simulations based on ab-initio based kinetic Monte Carlo methods.

In surface electrocatalysis, we develop and characterize novel ultrathin single crystalline metallic oxide electrodes, which are employed in the kinetic and stability studies of oxygen and chlorine evolution reaction. One of the major objectives is to unravel the elementary reaction steps in these evolution reactions and constructing the free energy profile using both electrochemical techniques and theoretical ab-initio methods. We conduct synchrotron based experiments to study in-situ the corrosion processes of such model electrodes under strongly oxidizing conditions.

 

Contact

Prof. Dr. Herbert Over

Institute of Physical Chemistry

Phone: +49-641-99-34550
Fax: +49-641-99-34599

Chemistry building, Heinrich-Buff-Ring 17, Room B 41

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Applications/Functionalities:

  • (Photo-)Electrocatalysis
  • Catalysis
  • Surface Technologies

 

Methods:

  • Chemical Analytics
  • Electrochemical Measurements
  • Mass Spectrometry
  • Scanning Probe Methods
  • Vibrational Spectroscopy
  • Structural Analytics

 

Classes of Materials:

  • Thin Films
  • Solid Electrolytes / mixed Conductors
  • Metal Anodes
  • Nanomaterials
  • Oxides