In Situ, Time-Resolved Reflectance Spectroscopy in the Microsecond Domain: Oxidation of Adsorbed Carbon Monoxide on Polycrystalline Pt Microelectrodes in Aqueous Solutions
| Autor: | Daniel Alberto Scherson, Ping Shi, Iosif Fromondi |
|---|---|
| Rok vydání: | 2006 |
| Předmět: |
Time Factors
Hydrogen Surface Properties Analytical chemistry chemistry.chemical_element Electrochemistry Sensitivity and Specificity Adsorption Desorption Monolayer General Materials Science Voltammetry Spectroscopy Platinum Carbon Monoxide Aqueous solution Water Surfaces and Interfaces Condensed Matter Physics Solutions Microsecond chemistry Spectrophotometry Crystallization Microelectrodes Oxidation-Reduction |
| Zdroj: | Langmuir. 22:10389-10398 |
| ISSN: | 1520-5827 0743-7463 |
| Popis: | 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 HClO4 aqueous solutions, using in situ, time-resolved, normalized differential reflectance spectroscopy lambda = 633 nm). Attention was focused on the unique dependence of COads 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. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|