Surface Reactions in High Electric Fields
Kinetics and Mechanism of Methanol Electrocatalysis
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Surface Reactions in High Electric Fields
A very high electric field, on the order of 1 V/Å, naturally occurs at the electrode/electrolyte interface. (Such fields occur at any metal surface, for that matter.) What makes the electrochemical situation unique is that the field can be controlled by controlling the electrode potential. At present there is very little expereimental information about how such high fields affect surface reactions. We are studying this phenomenon, in the context of understanding direct hydrocarbon oxidation for high temperature solid oxide fuel cells, with a field ionization system. The field ionization system is the only way to achieve such high fields experimentally. Fields are generated by applying potentials of several kilovolts to a platinum tip of approximately 350 Å radius. The accompanying PowerPoint presentation and so-called "quad chart", given at the AFOSR/ONR Workshop on March 4-6, 2002, outlines our research program. People working on this project are Dr. Valentin Medvedev (Research Associate) and graduate student Ravi Manghani.
Surface
Reaction Fundamentals in Direct Oxidation Hydrocarbon Fuel Cells (5.4
MB)
ONR
Quad Chart (864 kB)
For this presentation you will also need the following videos showing (1) our Wien filter discriminating between H3O+ (19) and H5O2+ (37), (2) a field desorption ramp of Ce+ ionization from a cerium coated Pt tip, and (3) a temperature ramp of field electron emission from a cerium coated Pt tip.Wien_19_37.avi (2.4 MB)You will also need one of the following codecs to run the videos:
FDM_PtCe.avi (4.2 MB)
FEM_T_Ramp_PtCe.avi (8.5 MB)iv5setup.exe (for PC)The Mac version runs in Mac OS 9.1 and 9.2 and possibly earlier OS's. We have not yet figured out how to run avi files in QuickTime with Mac OS 10.1.
IndeoVideo5 (for Mac - put in extensions folder)
05/08/03 v 2.0.0