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Permanent link (DOI): https://doi.org/10.7939/R3MD6V
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Development of Platinum and Platinum-Nickel Catalysts for Fuel Cell Applications Open Access
- Other title
direct alcohol fuel cell
glancing angle deposition
- Type of item
- Degree grantor
University of Alberta
- Author or creator
- Supervisor and department
Bergens, Steven (Chemistry)
- Examining committee member and department
Brett, Michael (Electrical and Computer Engineering)
Mar, Arthur (Chemistry)
Veinot, Jonathan (Chemistry)
Easton, E. Bradley (Chemistry)
Department of Chemistry
- Date accepted
- Graduation date
Doctor of Philosophy
- Degree level
This dissertation describes the use of a novel Pt deposition to prepare nickel- and carbon-supported platinum catalysts. The deposition is referred to herein as the platinum counter electrode deposition. The source of platinum is the sacrificial dissolution of a blacked platinum counter electrode under galvanostatic conditions that results in conformal, ultra-low loadings of platinum onto the substrates. It is shown that all or most of the platinum is located at the surface of the catalyst in the case where Pt is co-deposited with nickel from a solution of its salt. Furthermore, the deposition is self-limiting. Four major studies based on catalysts synthesized by this method are presented.
The opening study describes the deposition of platinum and co-deposition of platinum and nickel onto nickel foam substrates as well as the electronic and microscopic characteristics of the deposits. Further, the activity of the prepared catalysts towards 2-propanol oxidation in base was explored. Above 500 mV, the nickel and platinum co-deposit on nickel foam was 9 times more active than blackened Pt gauze, while the platinum deposit on nickel foam was 38 times more active.
The second study compares a conventional platinum deposition with the platinum counter electrode deposition on nickel nanopillar films prepared by Glancing Angle Deposition. The deposits prepared via our method were more active towards 2-propanol oxidation than both traditionally prepared deposits and commercially available state-of-the-art unsupported platinum nanoparticles.
The same nanopillar-supported platinum catalysts were prepared on glassy carbon disks for the third study. Activity towards oxygen reduction in base and acid was investigated. This is the first oxygen reduction study on nickel-platinum glancing angle deposited structures and the first such study in basic media.
The ultimate study describes the modification of the platinum counter electrode deposition to accommodate particulate substrates. As a proof of concept, we deposited platinum onto Vulcan carbon to fabricate a carbon-supported platinum catalyst that was microscopically and electrochemically characterized and tested for oxygen reduction. The results of this study suggest the utility of this deposition for a variety of particulate conductive substrates.
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- Citation for previous publication
S.A. Francis, S.H. Bergens, J. Power Sources 196 (2011) 7470-7480S.A. Francis, R.T. Tucker, M.J. Brett, J. S.H. Bergens, J. Power Sources 222 (2013) 533-541
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