ELECTROCHEMICAL QUARTZ-CRYSTAL MICROBALANCE STUDY OF COPPER ADATOMS ON AU(111) ELECTRODES IN SOLUTIONS OF PERCHLORIC AND SULFURIC-ACID

Citation
H. Uchida et al., ELECTROCHEMICAL QUARTZ-CRYSTAL MICROBALANCE STUDY OF COPPER ADATOMS ON AU(111) ELECTRODES IN SOLUTIONS OF PERCHLORIC AND SULFURIC-ACID, Journal of electroanalytical chemistry [1992], 452(1), 1998, pp. 97-106
Citations number
50
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Electrochemistry,"Chemistry Analytical
Journal title
Journal of electroanalytical chemistry [1992]
ISSN journal
1572-6657 → ACNP
Volume
452
Issue
1
Year of publication
1998
Pages
97 - 106
Database
ISI
SICI code
Abstract
The adsorption of anions on highly ordered (111)-type gold electrodes with and without Cu adatoms in perchloric and sulfuric acid electrolyt e solutions was investigated on an electrochemical quartz crystal micr obalance. A distinct increase in mass due to the specific adsorption o f hydrated bisulfate and perchlorate anions was observed in Cu2+ -free solutions and their amounts were determined as a function of the pote ntial. The composition of the Cu-adlayer (theta(Cu) and theta(anion), coverages of Cu adatoms and co-adsorbed anions) during formation or re moval in the potential sweep was also determined in both electrolyte s olutions. A pair of reversible anodic and cathodic peaks in the voltam mogram for the first Cu-upd region in H2SO4 was found to correspond we ll to the reversible changes in theta(Cu) and theta(anion). In contras t, asymmetric features of the voltammograms for the second Cu-upd regi on in H2SO4 and for whole processes in HClO4 corresponded to the large hysteresis in changes of theta(Cu) and theta(anion), probably origina ting from a slow rearrangement of both species. (C) 1998 Elsevier Scie nce S.A. All rights reserved.