Bergens, Steven - University of Alberta

个人简介

BSc, MSc, University of Toronto PhD, University of Chicago

研究领域

Research in the group is focused on enantioselective homogeneous catalysis and heterogeneous catalysis of electrochemical reactions in fuel cells. Enantioselective homogeneous catalysis occurs in solution where a prochiral substrate is preferentially transformed into one enantiomer of a chiral product by a small amount (typically 0.1%) of a chiral catalyst. Enantioselective catalysis is the most efficient method to produce chiral molecules, and is of major interest to the production of pharmaceuticals. Research in the group on enantioselective catalysis includes design, synthesis, and study of new chiral transition metal catalysts; elucidation of mechanisms of enantioselective catalytic transformations using isotope substitution, kinetics, and low temperature NMR; and preparation of highly reusable polymeric catalysts by ring opening olefin metathesis polymerization (ROMP). A fuel cell is a device that converts the free energy of oxidation of a fuel directly into electrical work. Theoretical efficiencies of fuel cells routinely exceed 90%, and the development of a fuel cell that operates with methanol as fuel would have tremendous beneficial effects both on the environment and on the economy. Research on fuel cells in the group includes synthesis of nanoparticle cocatalysts for the electrochemical oxidation of hydrogen and alcohols; and use of magnetic resonance imaging to observe the distribution of water throughout operating fuel cells. Research in the group is inherently multidisciplinary. Graduate students become proficient in the techniques and principles of synthetic organic and organometallic chemistry, enantioselective catalysis, electrochemistry, and the construction and operation of prototype fuel cells.

近期论文

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D. Cao and S. H. Bergens, Pt-Ru-adatom nanoparticles as anode catalysts for direct methanol fuel cells, Journal of Power Sources, vol. 134, iss. 2, pp. 170-180, 2004. Go to document bibtex C. K. Ralph, O. M. Akotsi, and S. H. Bergens, A reusable polymeric asymmetric hydrogenation catalyst made by ring-opening olefin metathesis polymerization, Organometallics, vol. 23, iss. 7, pp. 1484-1486, 2004. Go to document bibtex K. Feindel, L. P. -A. LaRocque, D. Cao, R. Du, R. E. Wasylishen, and S. H. Bergens, Magnetic resonance imaging of operating H-2/O-2 fuel cells and towards rechargeable 2-propanol fuel cells, , Quebec, 2005, p. 1570. Go to document bibtex R. J. Hamilton, C. G. Leong, G. Bigam, M. Miskolzie, and S. H. Bergens, A ruthenium-dihydrogen putative intermediate in ketone hydrogenation, JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, vol. 127, iss. 12, pp. 4152-4153, 2005. bibtex K. W. Feindel, S. H. Bergens, and R. E. Wasylishen, The use of H-1 NMR microscopy to study proton-exchange membrane fuel cells, ChemPhysChem, vol. 7, iss. 1, pp. 67-75, 2006. Go to document bibtex C. J. A. Daley, J. A. Wiles, and S. H. Bergens, Substrate effects on the mechanism of enantioselective hydrogenation using ruthenium bis(phosphine) complexes as catalyst: A mechanistic investigation of the hydrogenation of α,β-unsaturated acids and esters based on deuterium labeling studies, Inorganica Chimica Acta, vol. 359, iss. 9, pp. 2760-2770, 2006. Go to document bibtex R. J. Hamilton and S. H. Bergens, An unexpected possible role of base in asymmetric catalytic hydrogenations of ketones. Synthesis and characterization of several key catalytic intermediates, JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, vol. 128, iss. 42, pp. 13700-13701, 2006. bibtex K. W. Feindel, S. H. Bergens, and R. E. Wasylishen, Insights into the distribution of water in a self-humidifying H-2/O-2 proton- exchange membrane fuel cell using H-1 NMR microscopy, Journal of the American Chemical Society, vol. 128, iss. 43, pp. 14192-14199, 2006. Go to document bibtex M. E. P. Markiewicz, D. M. Hebert, and S. H. Bergens, Electro-oxidation of 2-propanol on platinum in alkaline electrolytes, Journal of Power Sources, vol. 161, iss. 2, pp. 761-767, 2006. Go to document bibtex C. K. Ralph and S. H. Bergens, A highly reusable catalyst for enantioselective ketone hydrogenation. Catalyst-organic frameworks by alternating ROMP assembly, Organometallics, vol. 26, iss. 7, pp. 1571-1574, 2007. Go to document bibtex K. W. Feindel, S. H. Bergens, and R. E. Wasylishen, The influence of membrane electrode assembly water content on the performance of a polymer electrolyte membrane fuel cell as investigated by H-1 NMR microscopy, Physical Chemistry Chemical Physics, vol. 9, iss. 15, pp. 1850-1857, 2007. Go to document bibtex K. W. Feindel, S. H. Bergens, and R. E. Wasylishen, Use of hydrogen-deuterium exchange for contrast in H-1 NMR microscopy investigations of an operating PEM fuel cell, Journal of Power Sources, vol. 173, iss. 1, pp. 86-95, 2007. Go to document bibtex R. J. Hamilton and S. H. Bergens, Direct observations of the metal-ligand bifunctional addition step in an enantioselective ketone hydrogenation, Journal of the American Chemical Society, vol. 130, iss. 36, pp. 11979-11987, 2008. Go to document bibtex M. E. P. Markiewicz and S. H. Bergens, Electro-oxidation of 2-propanol and acetone over platinum, platinum-ruthenium, and ruthenium nanoparticles in alkaline electrolytes, Journal of Power Sources, vol. 185, iss. 1, pp. 222-225, 2008. Go to document bibtex S. Takebayashi and S. H. Bergens, Facile Bifunctional Addition of Lactones and Esters at Low Temperatures. The First Intermediates in Lactone/Ester Hydrogenations, ORGANOMETALLICS, vol. 28, iss. 8, pp. 2349-2351, 2009. bibtex L. N. Menard and S. H. Bergens, An unexpected, self-regulating codeposition of nickel and platinum forming deposits with surfaces enriched in platinum, Journal of Power Sources, vol. 194, iss. 1, pp. 298-302, 2009. Go to document bibtex M. T. Wang, K. W. Feindel, S. H. Bergens, and R. E. Wasylishen, In situ quantification of the in-plane water content in the Nafion (R) membrane of an operating polymer-electrolyte membrane fuel cell using H-1 micro-magnetic resonance imaging experiments, JOURNAL OF POWER SOURCES, vol. 195, iss. 21, pp. 7316-7322, 2010. bibtex M. E. P. Markiewicz and S. H. Bergens, A liquid electrolyte alkaline direct 2-propanol fuel cell, JOURNAL OF POWER SOURCES, vol. 195, iss. 21, pp. 7196-7201, 2010. bibtex S. H. Bergens and S. Takebayashi, Process for the asymmetric hydrogenation of imides, Patent record available from the World Intellectual Property Organization (WIPO), 2010. Go to document bibtex S. Takebayashi, J. M. John, and S. H. Bergens, Desymmetrization of meso-Cyclic Imides via Enantioselective Monohydrogenation, JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, vol. 132, iss. 37, pp. 12832-12834, 2010.