Ex situ scanning tunneling microscopy study of under-potential oxidation of a Ag(111) electrode in an alkaline electrolyte

Autor:	Elena R. Savinova, Karl Doblhofer, Andreas Scheybal, Robert Schlögl, Shamil K. Shaikhutdinov
Rok vydání:	2001
Předmět:	Chemistry General Chemical Engineering Analytical chemistry Electrolyte engineering.material Electrochemistry Analytical Chemistry law.invention law Electrode engineering Noble metal Point of zero charge Scanning tunneling microscope Single crystal Electrode potential
Zdroj:	Journal of Electroanalytical Chemistry. 500:208-212
ISSN:	1572-6657
DOI:	10.1016/s0022-0728(00)00346-6
Popis:	A Ag(111) single crystal electrode emersed from NaF+NaOH electrolyte (pH 11) under potential control in the interval between −0.8 V and +0.2 V vs. Hg | HgO was studied by scanning tunneling microscopy (STM) in an inert atmosphere. The STM images show that the oxidation of the Ag(111) surface starts above the point of zero charge and exhibits a nucleation-growth mechanism. It starts at the steps and extends to the terraces as the electrode potential is scanned positive. Potential reversal restores the initial surface morphology. The reaction-induced features imaged in STM as dark spots are assigned as islands of chemisorbed oxygen-containing species. The irregular shape of the islands points to the diffusion of ad-species as the limiting step of the process.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::b43c9ebcc005690cc3782d54cfbf6624 https://doi.org/10.1016/s0022-0728(00)00346-6 Zobrazit plný text záznamu Full Text from ScienceDirect