In situ, time-resolved reflectance spectroscopy in the microsecond domain: Oxidation of adsorbed carbon monoxide on polycrystalline Pt microelectrodes in aqueous solutions

Ping Shi, Iosif Fromondi, Daniel Alberto Scherson

Research output: Contribution to journalArticle

10 Citations (Scopus)

Abstract

The dynamics of the electrooxidation of adsorbed CO, COads, on polycrystalline Pt microelectrodes has been examined in CO-saturated 0.5 M H2SO4 and 0.5 M HCIO4 aqueous solutions, using in situ, time-resolved, normalized differential reflectance spectroscopy (λ = 633 nm). Attention was focused on the unique dependence of CO ads oxidation on the potential at which the adsorbed full CO monolayer is assembled (i.e., hydrogen adsorption/desorption vs the double-layer region) using both fast linear scan voltammetry and potential step techniques. As evidenced from the data collected, COads oxidation at a fixed potential proceeds at slower rates when the monolayer is formed in the double-layer region compared to when it is formed in the hydrogen adsorption/desorption region. Possible explanations for this effect are discussed.

Original languageEnglish
Pages (from-to)10389-10398
Number of pages10
JournalLangmuir
Volume22
Issue number25
DOIs
Publication statusPublished - 2006 Dec 5
Externally publishedYes

    Fingerprint

ASJC Scopus subject areas

  • Colloid and Surface Chemistry
  • Physical and Theoretical Chemistry

Cite this