The Resource Morphology and property control of Pt submonolayers deposited via surface-limited redox replacement reaction, by Dincer Gokcen

Morphology and property control of Pt submonolayers deposited via surface-limited redox replacement reaction, by Dincer Gokcen

Label
Morphology and property control of Pt submonolayers deposited via surface-limited redox replacement reaction
Title
Morphology and property control of Pt submonolayers deposited via surface-limited redox replacement reaction
Statement of responsibility
by Dincer Gokcen
Title variation
Morphology and property control of platinum submonolayers deposited via surface-limited redox replacement action
Creator
Subject
Language
eng
Summary
Low-dimensional growth of noble metals via the surface-limited redox replacement reaction (SLRR) has been extensively used for the preparation of highly active catalyst materials, functional surfaces, and growth of ultrathin epitaxial films. Despite the fact that the concept behind this deposition method has the potential for use in a wide range of applications, the governing thermodynamics and kinetic processes controlling the morphology and catalytic properties of the deposited noble metal layers still need to be elaborated. In the first part of this research, the work exploring the stoichiometry of Pt deposition via SLRR of the underpotentially deposited (UPD) Cu monolayer on Au(111) is studied. The experimental results indicate that the Pt submonolayers have two-dimensional morphology and a linear dependence of their coverage on the amount (coverage) of the replaced Cu UPD monolayers. The electrochemical and scanning tunneling microscopy (STM) analyses also stress the role of the anions in determining the stoichiometry of the metal deposition reaction via SLRR of the UPD monolayers. The second part of this dissertation focuses on the effect of the deposition flux on kinetics of nucleation density, coverage, and morphology of the Pt submonolayers. The experimental results show that the SLRR kinetics is dependent on experimental conditions. The full analytical model describing the redox reaction kinetics and Pt nucleation density as a function of replaced UPD monolayer coverage is presented and discussed against experimental data. Moreover, this study also introduces a new technique for continuous Pt submonolayer deposition via redox replacement of underpotentially deposited bi-metallic (Pb/Cu) bi-layers. As a part of this research, the nano-organization and morphology control of Pt monolayers are achieved via SLRR guided by supramolecular templates. Several organic molecules were employed as supramolecular moieties on Cu(UPD)/Au(111) and Au(111) surfaces. Owing to potential applications of low-dimensional Pt deposits, especially in the field of fuel-cell applications, this work also involves combined STM and electrochemical results investigating the activity of 2D Pt/Au(111) clusters towards the hydrogen oxidation reaction (HOR). The catalytic activity is studied as a function of average Pt cluster size and coverage. The results revealed that the size of the 2D Pt clusters, as well as the coverage, have a significant effect on the catalytic activity for the HOR. The optimum design criteria for Pt submonolayer catalysts are also elaborated in this work
Cataloging source
MUU
http://library.link/vocab/creatorName
Gokcen, Dincer
Degree
Ph. D.
Dissertation year
2010.
Granting institution
University of Houston
Illustrations
illustrations
Index
no index present
Literary form
non fiction
Nature of contents
  • bibliography
  • theses
http://library.link/vocab/subjectName
  • Electroplating
  • Transition metal alloys
  • Oxidation-reduction reaction
  • Thin films, Multilayered
  • Platinum
  • Gold
Target audience
specialized
Label
Morphology and property control of Pt submonolayers deposited via surface-limited redox replacement reaction, by Dincer Gokcen
Instantiates
Publication
Note
  • Degree granted by Dept. of Electrical and Computer Engineering, Cullen College of Engineering
  • Typescript
Bibliography note
Includes bibliographical references (leaves 137-147)
Carrier category
volume
Carrier category code
  • nc
Carrier MARC source
rdacarrier
Content category
text
Content type code
  • txt
Content type MARC source
rdacontent
Control code
810918530
Dimensions
29 cm
Extent
xvii, 151 leaves
Form of item
regular print reproduction
Media category
unmediated
Media MARC source
rdamedia
Media type code
  • n
Other physical details
illustrations (some color)
Reproduction note
Photocopy.
System control number
(OCoLC)810918530
Label
Morphology and property control of Pt submonolayers deposited via surface-limited redox replacement reaction, by Dincer Gokcen
Publication
Note
  • Degree granted by Dept. of Electrical and Computer Engineering, Cullen College of Engineering
  • Typescript
Bibliography note
Includes bibliographical references (leaves 137-147)
Carrier category
volume
Carrier category code
  • nc
Carrier MARC source
rdacarrier
Content category
text
Content type code
  • txt
Content type MARC source
rdacontent
Control code
810918530
Dimensions
29 cm
Extent
xvii, 151 leaves
Form of item
regular print reproduction
Media category
unmediated
Media MARC source
rdamedia
Media type code
  • n
Other physical details
illustrations (some color)
Reproduction note
Photocopy.
System control number
(OCoLC)810918530

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