Studies of the Structure and Electrocatalytic Reduction of Oxygen on Modified Electrode Surfaces
Kim, Jongwon
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https://hdl.handle.net/2142/84190
Description
Title
Studies of the Structure and Electrocatalytic Reduction of Oxygen on Modified Electrode Surfaces
Author(s)
Kim, Jongwon
Issue Date
2005
Doctoral Committee Chair(s)
Gewirth, Andrew A.
Department of Study
Chemistry
Discipline
Chemistry
Degree Granting Institution
University of Illinois at Urbana-Champaign
Degree Name
Ph.D.
Degree Level
Dissertation
Keyword(s)
Chemistry, Physical
Language
eng
Abstract
Finally, the mechanism of the electroreduction of oxygen on Au surfaces in basic media is examined using SERS and density functional theory calculations. The spectroscopy reveals superoxide species as a reduction intermediate, while no peroxide is detected. The spectroscopy also shows the presence of superoxide after the addition of hydrogen peroxide. The calculations show no effect of OH addition to the Au(100) surface with regard to O-O length. These results suggest that the four-electron reduction of O2 on Au(100) in base arises from a disproportionation mechanism, which is enhanced on Au(100) relative to the other two low Miller index faces of Au.
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