Scanning electrochemical microscopy as a dynamic probe of metal adsorption, nucleation and growth on surfaces: Silver deposition on pyrite
UNSPECIFIED (2000) Scanning electrochemical microscopy as a dynamic probe of metal adsorption, nucleation and growth on surfaces: Silver deposition on pyrite. In: International Symposium on Localized In-Situ Methods for Investigating Electrochemical Interfaces, HONOLULU, HI, OCT 20-21, 1999. Published in: LOCALIZED IN-SITU METHODS FOR INVESTIGATING ELECTROCHEMICAL INTERFACES, 99 (28). pp. 104-121.Full text not available from this repository.
A new approach, based on the scanning electrochemical microscope (SECM), is described for investigating the uptake of metal ions by solid surfaces. The basic idea is to employ the tip of the SECM - positioned close to the solid/liquid interface under investigation - to quantitatively inject the metal ion (reactant) of interest, and monitor the uptake via the current response. In this way, the interfacial flux of metal ion at the substrate/solution interface can be determined directly. The adsorption of Age and deposition of silver on pyrite (100) surfaces have been investigated using this approach. To measure local silver uptake, Ag+ ions are electrogenerated via the anodic dissolution of a silver ultramicroelectrode (UME), located adjacent to a pyrite sample in aqueous solution. Under potentiostatic control, the current response of the reversible Ag/Ag+ UME process is governed by the rare of Ag+ transport away from the probe surface. This, in turn, depends on the extent to which Ag+ interacts with the pyrite surface. In particular, adsorption or nucleation/growth processes at the sample surface enhance the UME current flow compared to the case where the sample is inert. It is shown how this approach can be used to determine Ag+ adsorption kinetics on pyrite for the first time, along with the nucleation density and growth rate involved in silver deposition.
|Item Type:||Conference Item (UNSPECIFIED)|
|Subjects:||Q Science > QD Chemistry|
|Series Name:||ELECTROCHEMICAL SOCIETY SERIES|
|Journal or Publication Title:||LOCALIZED IN-SITU METHODS FOR INVESTIGATING ELECTROCHEMICAL INTERFACES|
|Publisher:||ELECTROCHEMICAL SOCIETY INC|
|Editor:||Taylor, SR and Hillier, AC and Seo, M|
|Number of Pages:||4|
|Page Range:||pp. 104-121|
|Title of Event:||International Symposium on Localized In-Situ Methods for Investigating Electrochemical Interfaces|
|Location of Event:||HONOLULU, HI|
|Date(s) of Event:||OCT 20-21, 1999|
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