The water-reactivity of Al-Ga and Al-Ga-In-Sn alloys is investigated as a means to utilize the chemical potential energy of Al to generate H2 and heat. Bulk quantities of these alloys participate in a heterogeneous reaction with water to produce H2 and α-Al(OH)3 (bayerite) as confirmed by gas chromatography and X-ray diffractometry, respectively. Experiments suggest the reaction is enabled by a mechanism involving multiple alloy phases, where Al solvated in a liquid phase is transported to an interface between the alloy and water resulting in the Al being consumed by reaction. Differential scanning calorimetry indicates that for the Al-Ga-In-Sn quaternary system, the temperature at which this reaction-enabling phase liquefies is 9.38°C. H2 yield data is collected from the reaction of 50 wt% Al-34 wt% Ga-11 wt% In-5 wt% Sn alloys with water and analyzed with respect to time and temperature. Samples of this composition produced an average H 2 yield of 83.8%. A fit to the data using fractional order kinetic analysis establishes the activation energy for the rate-limiting step to be 43.8 kJ/mol.
|Advisor:||Woodall, Jerry M.|
|Commitee:||Franses, Elias I., Handwerker, Carol A., Sands, Timothy D.|
|Department:||Electrical and Computer Engineering|
|School Location:||United States -- Indiana|
|Source:||DAI-B 71/09, Dissertation Abstracts International|
|Subjects:||Analytical chemistry, Electrical engineering, Materials science|
|Keywords:||Aluminum, Energy storage, Gallium, Hydrogen, Liquid phase, Water|
Copyright in each Dissertation and Thesis is retained by the author. All Rights Reserved
The supplemental file or files you are about to download were provided to ProQuest by the author as part of a
dissertation or thesis. The supplemental files are provided "AS IS" without warranty. ProQuest is not responsible for the
content, format or impact on the supplemental file(s) on our system. in some cases, the file type may be unknown or
may be a .exe file. We recommend caution as you open such files.
Copyright of the original materials contained in the supplemental file is retained by the author and your access to the
supplemental files is subject to the ProQuest Terms and Conditions of use.
Depending on the size of the file(s) you are downloading, the system may take some time to download them. Please be