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Your search keyword '"Kevin O'Neill"' showing total 13 results
Start Over Author "Kevin O'Neill" Publisher the electrochemical society
13 results on '"Kevin O'Neill"'

1. Characterizing Polymeric Leachants for Potential System Contaminants of Fuel Cells

Author

Sidney Coombs, Bryan S. Pivovar, Kevin O'Neill, Guido Bender, Huyen N. Dinh, Heli Wang, and Clay S. Macomber

Subjects
chemistry.chemical_classification, Proton exchange membrane fuel cell, Polymer, Contamination, Pulp and paper industry, Durability, law.invention, Neoprene, chemistry, Natural rubber, law, visual_art, visual_art.visual_art_medium, Environmental science, Degradation (geology), Chemical decomposition
Abstract

The role of system contaminants in the performance degradation of Proton Exchange Membrane (PEM) fuel cells has been underappreciated to date. This work seeks to identify potential contaminants of system components with the ultimate goal of tying contaminant exposure to performance and durability After aging of select polymers in solution, leachant samples were qualitatively identified via GCMS and FTIR-ATR. Total Organic Carbon (TOC) content quantitatively provided information relative to contaminant level extracted from polymeric samples. Results will be presented focusing on SBR rubber and neoprene. Qualitative concentration vs. time charts elucidate leachant evolution, showing among other things potential chemical degradation in solution.

Published
2010

2. The Role of Nitrogen Doping on Durability in the Pt-Ru/HOPG System

Author

Ryan O'Hayre, Shyam S. Kocha, Bryan Gorman, Kenneth C. Neyerlin, Tim S. Olson, Aimee Queen, Arrelaine A. Dameron, Huyen N. Dinh, D. S. Ginley, Kevin O'Neill, Svitlana Pylypenko, and Thomas Gennett

Subjects
Materials science, Chemical engineering, Phase (matter), Catalyst support, Doping, Inorganic chemistry, Nitrogen doping, Nanoparticle, Pyrolytic carbon, Durability, Catalysis
Abstract

This study investigates the role of the nitrogen doping on the durability of Pt-Ru metal nanophase catalysts supported on highly-oriented pyrolytic graphite (HOPG) substrates. The effect of the ion dose during N2 low ion energy implantation on the degree of the HOPG modification and levels of nitrogen doping are evaluated using X-ray photoelectron and Raman spectroscopy. Pt-Ru catalyst metal was deposited onto unmodified and N-implanted HOPG substrates using microwave and magnetron sputtering deposition routes, resulting in deposition either with or without preferential nucleation in the defect-sites. The role of the nitrogen on improved bonding between catalyst and support is evident from the microscopic evaluation of substrates after potential cycling.

Published
2010

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