Evidence for diffusional coupling in electrochemical thin layers: implications for surface coverage calibration via electrochemical infrared spectroscopy

Autor:	L. J. Deiner, Francisco Carlos Nart
Rok vydání:	2007
Předmět:	Thin layers Infrared Chemistry Diffusion Analytical chemistry Infrared spectroscopy Electrolyte Condensed Matter Physics Electrochemistry Absorbance General Materials Science Electrical and Electronic Engineering Fourier transform infrared spectroscopy
Zdroj:	Journal of Solid State Electrochemistry. 12:511-516
ISSN:	1433-0768 1432-8488
Popis:	The time dependence of the concentration of CO2 in an electrochemical thin layer cavity is studied with Fourier transform infrared spectroscopy (FTIR) in order to evaluate the extent to which the thin layer cavity is diffusionally decoupled from the surrounding bulk electrolyte. For the model system of CO on Pt(111) in 0.1 M HClO4, it is found that the concentration of CO2, formed by electro-oxidation of CO, equilibrates rapidly with the surrounding bulk electrolyte. This rapid equilibration indicates that there is diffusion out of the thin layer, even on the short time scales of typical infrared experiments (1–3 min). However, since the measured CO2 absorbance intensity as a function of time is reproducible to within 10%, a new time-dependent method for surface coverage calibration using solution-phase species is proposed.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::1860b5e024c56c0097697a3b187bbba2 https://doi.org/10.1007/s10008-007-0333-1 Zobrazit plný text záznamu Full text from SpringerLink