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Hydrogen interaction with Al(111) and Ti-doped Al(111) surfaces for H storage applications
Descriptive
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Title
Hydrogen interaction with Al(111) and Ti-doped Al(111)
surfaces for H storage applications
surfaces for H storage applications
Name
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Schaefer
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Stefan P.
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Stefan P. Schaefer
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author
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Chabal
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Yves
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Advisory Committee
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Yves J. Chabal
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chair
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Bartynski
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Robert
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Advisory Committee
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Robert A. Bartynski
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internal member
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Madey
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Theodore
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Advisory Committee
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Theodore E. Madey
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Rutgers University
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degree grantor
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Graduate School - New Brunswick
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Text
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theses
OriginInfo
DateCreated
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2007
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2007
Language
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English
PhysicalDescription
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electronic
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application/pdf
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text/xml
Extent
xii, 76 pages
Abstract
Complex metal hydrides are promising candidates for hydrogen storage applications.
Most of these materials consist of aluminum mixed with other elements. It was found
that titanium doping allows their use in a convenient temperature and pressure range.
Therefore the key process is the dissociation of molecular hydrogen at a Ti catalyst on the surface. Preliminary studies with pure and titanium-doped aluminum surfaces are
undertaken to gain a basic understanding of the hydrogen adsorption mechanism.
The interaction of hydrogen with an Al(111) surface was studied using Infrared Reflection
Absorption Spectroscopy (IRRAS) under Ultra High Vacuum (UHV) conditions. Hereby the formation of aluminum hydrides (alanes) in different sizes was observed depending on the hydrogen coverage of the surface. The growth of larger alanes is favored at higher H exposures. Different measurements were carried out for temperatures of 93, 180 and 259K and it was found that larger alanes form at higher temperatures.
In another step of the experiment an Al surface was doped with titanium atoms emitted from a home-built Ti-source. Ti structures with a thickness of less than one monolayer (ML) were grown at 105K and a Ti film of around one ML was deposited at room temperature. The deposition rate was determined with a quartz crystal monitor and the deposition on the surface could be verified by Auger Electron Spectroscopy (AES). Low Energy Electron Diffraction (LEED) patterns were recorded before and after different Ti-depositions and were always showing the typical hexagonal symmetry for the closed packed (111) surface of the fcc Al crystal.
To compare the vibrational modes of alanes forming on Al(111) surfaces with the ones of solid state AlH3 Fourier Transform Infrared Spectroscopy (FTIR) was performed in a different setup using a high vacuum. No matches of the frequencies could be found but the decomposition of AlH3 to Al and H could be observed at temperatures higher than 170°C.
Most of these materials consist of aluminum mixed with other elements. It was found
that titanium doping allows their use in a convenient temperature and pressure range.
Therefore the key process is the dissociation of molecular hydrogen at a Ti catalyst on the surface. Preliminary studies with pure and titanium-doped aluminum surfaces are
undertaken to gain a basic understanding of the hydrogen adsorption mechanism.
The interaction of hydrogen with an Al(111) surface was studied using Infrared Reflection
Absorption Spectroscopy (IRRAS) under Ultra High Vacuum (UHV) conditions. Hereby the formation of aluminum hydrides (alanes) in different sizes was observed depending on the hydrogen coverage of the surface. The growth of larger alanes is favored at higher H exposures. Different measurements were carried out for temperatures of 93, 180 and 259K and it was found that larger alanes form at higher temperatures.
In another step of the experiment an Al surface was doped with titanium atoms emitted from a home-built Ti-source. Ti structures with a thickness of less than one monolayer (ML) were grown at 105K and a Ti film of around one ML was deposited at room temperature. The deposition rate was determined with a quartz crystal monitor and the deposition on the surface could be verified by Auger Electron Spectroscopy (AES). Low Energy Electron Diffraction (LEED) patterns were recorded before and after different Ti-depositions and were always showing the typical hexagonal symmetry for the closed packed (111) surface of the fcc Al crystal.
To compare the vibrational modes of alanes forming on Al(111) surfaces with the ones of solid state AlH3 Fourier Transform Infrared Spectroscopy (FTIR) was performed in a different setup using a high vacuum. No matches of the frequencies could be found but the decomposition of AlH3 to Al and H could be observed at temperatures higher than 170°C.
Note
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M.S.
Note
(type = bibliography)
Includes bibliographical references (p. 74-76).
Subject
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Topic
Physics and Astronomy
Subject
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Topic
Hydrogen--Storage
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Title
Graduate School - New Brunswick Electronic Theses and Dissertations
Identifier
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rucore19991600001
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http://hdl.rutgers.edu/1782.2/rucore10001600001.ETD.16774
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ETD_350
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Identifier
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doi:10.7282/T30V8D6D
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ETD graduate
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The author owns the copyright to this work.
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Copyright protected
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Open
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Stefan Schaefer
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Rutgers University. Graduate School - New Brunswick
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Non-exclusive ETD license
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I hereby grant to the Rutgers University Libraries and to my school the non-exclusive right to archive, reproduce and distribute my thesis or dissertation, in whole or in part, and/or my abstract, in whole or in part, in and from an electronic format, subject to the release date subsequently stipulated in this submittal form and approved by my school. I represent and stipulate that the thesis or dissertation and its abstract are my original work, that they do not infringe or violate any rights of others, and that I make these grants as the sole owner of the rights to my thesis or dissertation and its abstract. I represent that I have obtained written permissions, when necessary, from the owner(s) of each third party copyrighted matter to be included in my thesis or dissertation and will supply copies of such upon request by my school. I acknowledge that RU ETD and my school will not distribute my thesis or dissertation or its abstract if, in their reasonable judgment, they believe all such rights have not been secured. I acknowledge that I retain ownership rights to the copyright of my work. I also retain the right to use all or part of this thesis or dissertation in future works, such as articles or books.
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