Electrocatalysis in Alkaline Media: Mechanistic Studies of Fuel Cell Reactions on Well-Defined Model Catalysts
Spendelow, Jacob S.
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https://hdl.handle.net/2142/82388
Description
Title
Electrocatalysis in Alkaline Media: Mechanistic Studies of Fuel Cell Reactions on Well-Defined Model Catalysts
Author(s)
Spendelow, Jacob S.
Issue Date
2006
Doctoral Committee Chair(s)
Kenis, Paul J.A.
Wieckowski, Andrzej
Department of Study
Chemical and Biomolecular Engineering
Discipline
Chemical and Biomolecular Engineering
Degree Granting Institution
University of Illinois at Urbana-Champaign
Degree Name
Ph.D.
Degree Level
Dissertation
Keyword(s)
Energy
Language
eng
Abstract
Ru was found to promote both methanol dehydrogenation and CO oxidation on adjacent Pt sites. Ru enhances methanol dehydrogenation through two distinct ligand effects: it increases the intrinsic dehydrogenation activity of adjacent Pt sites, and it causes CO to diffuse away from these active sites, decreasing the CO poisoning effect. A Ru ligand effect also enhances CO oxidation by weakening the Pt-CO bond. Ru supplies adsorbed OH for bifunctional CO oxidation, but since Pt defects can also supply OH in alkaline media, the Ru bifunctional effect is less significant than the three ligand effects.
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