Surface Coverage and Structure of Catalytic Monolayers on Au(111) Electrodes

Niece, Brian Keith

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Description

Title

Surface Coverage and Structure of Catalytic Monolayers on Au(111) Electrodes

Author(s)

Niece, Brian Keith

Issue Date

1997

Doctoral Committee Chair(s)

Gewirth, Andrew A.

Department of Study

Chemistry

Discipline

Chemistry

Degree Granting Institution

University of Illinois at Urbana-Champaign

Degree Name

Ph.D.

Degree Level

Dissertation

Keyword(s)

Chemistry, Analytical

Language

eng

Abstract

Finally, active molecular adsorbates are investigated. Cyclic voltammetric investigations of the $\alpha$-dodecatungstosilicate anion, which has potential applications in catalysis and corrosion inhibition, indicate that it binds to the Au(111) electrode throughout the double layer potential region. At positive potentials, it delays the onset of gold oxide formation. At extreme negative electrode potentials, the anion desorbs from the surface, confirming activity observed with SPM. Quartz crystal microbalance studies found a mass change smaller than that expected for a full monolayer of $\alpha$-dodecatungstosilicate anions, indicating that there is only a monolayer present on the surface and that it remains in the solution layer near the electrode surface after desorption. Finally, quartz crystal microbalance studies of uracil desorption from Au(111) in neutral solutions indicate that the desorbed mass changes linearly as a function of uracil concentration. This indicates that under these conditions uracil is actually adsorbed in a multilayer. (Abstract shortened by UMI.).

Graduation Semester

1997

Type of Resource

text

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