Mechanism of oxygen electroreduction on gold surfaces in basic media

Jongwon Kim, Andrew A. Gewirth

Research output: Contribution to journalArticlepeer-review


The mechanism of the electroreduction of oxygen on Au surfaces in basic media is examined using surface-enhanced Raman scattering (SERS) measurements and density functional theory (DFT) calculations. The spectroscopy reveals superoxide species as a reduction intermediate throughout the oxygen electroreduction, 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 O 2 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.

Original languageEnglish (US)
Pages (from-to)2565-2571
Number of pages7
JournalJournal of Physical Chemistry B
Issue number6
StatePublished - Feb 16 2006

ASJC Scopus subject areas

  • Physical and Theoretical Chemistry
  • Surfaces, Coatings and Films
  • Materials Chemistry


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