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Research Interests and Projects in the Young Lab

 
 

 

Proton-coupled electron transfer (PCET)

 

Management of charge transfer is at the heart of chemistry, physics and biology. In biological systems, charge transport occurs in proteins and peptides along well defined pathways. Charge balance must be maintained, meaning that movement of an electron along a pathway is coupled to shorter proton movements in a mechanism which has come to be known as proton-coupled electron transfer (PCET). Examples of PCET include the photo-induced oxidation of water to oxygen at the oxygen-evolving complex (OEC) of Photosystem II.

A primary goal of the Young Lab is the design and study of model PCET systems that can motivate further development of PCET theory. Important design issues facing mechanistic studies are the incorporation of optical signatures for both ET and PT and a means for tuning parameters within the PCET system.

 

 

 

 

Charge transfer in photovoltaic materials

 

The sun provides enough energy to the Earth’s surface in one day to meet our energy needs for an entire year. Thus, harnessing the sun’s energy is an attractive paradigm to help meet our energy needs using a renewable energy source. The photovoltaic effect represents the conversion of photons into electrical power. PV cells are devices that convert the sun’s light into electricity. These devices show great promise to supplement our energy supply and represent an active area of research in chemistry, materials science, electrical engineering and physics.

Organic PVs present a significant advantage over Si-based solar cells in that they can be light weight, deposited on flexible substrates and are made of inexpensive materials. The focus of work in The Young lab will be to measure and understand kinetic processes on timescales at play in exciton generation and diffusion in organic heterojunction structures.

 

 

 

 

Laser lab setup

 

The Young lab will establish a sophisticated laser lab in which we will take our time-resolved absorption and emission measurements. Initial experimental setup utilized time-correlated single photon counting measurements for time resolved emission. In time, we will incorporate a regenerative amplifier laser system that will be used for transient absorption measurements.

 
 
 
Publications:
 
Akselrod, G. M.; Young, E. R.; Bradley, M. S.; Bulović, V. “Lasing through a strongly-coupled mode by intra-cavity pumping,” Opt. Express 2013, 21, 12122-12128. [link]
Costi, R.; Young, E. R.; Bulović, V.; Nocera, D. G. “Stabilized CdSe-CoPi composite photoanode for light-assisted water oxidation by transformation of a CdSe/cobalt metal thin film.” ACS Appl. Mater. Interfaces 2013, 5, 2364-2367.[link]

Young, E. R.; Rosenthal R.; Nocera, D. G. “Energy transfer mediated by asymmetric hydrogen- bonded interfaces.” Chem. Sci. 2012, 3, 455-459.[link]

Young, E. R.; Costi, R.; Paydavosi, S.; Nocera, D. G.; Bulović, V. “Photo-assisted water oxidation with cobalt-based catalyst formed from thin-film cobalt metal on silicon photoanodes.” Energ & Environ. Sci. 2011, 4, 2058-2061.[link]

Akselrod, G. M.; Tischler, J. R.; Young, E. R.; Nocera, D. G.; Bulović, V.; “Exciton-exciton annihilation in organic polariton microcavities.” Phys. Rev.B 2010, 82, 113106-1 - 113106-4. [link]

Young, E. R.; Nocera, D. G.; Bulović, V. “Direct formation of a water oxidation catalyst from thin-film cobalt.” Energ & Environ. Sci. 2010 3, 1726-1728. [link]

Young, E. R.; Rosenthal, J.; Hodgkiss, J. M.; Nocera, D. G. “A comparative PCET study of a donor-acceptor pair linked by ionized and non-ionized asymmetric hydrogen-bonded interfaces.” J. Am. Chem. Soc. 2009 131, 7678-7684. [link]

Young, E. R.; Rosenthal, J.; Nocera, D. G. “Spectral observation of conversion between ionized vs. non-ionized proton-coupled electron transfer interfaces.” Chem. Comm. 2008, 20, 2322-2324.[link]

Bachmann, J.; Hodgkiss, J. M.; Young, E. R.; Nocera, D. G. “Ground- and excited-state reactivity of iron porphyrinogens.” Inorg. Chem. 2007, 46, 607-609.[link]

Rosenthal, J.; Young, E. R.; Nocera, D. G. “Structurally homologous β - and meso-alkynyl amidinium porphyrins.” Inorg. Chem. 2007, 46, 8668-8675.[link] 

Rosenthal, J.; Hodgkiss, J. M.; Young, E. R.; Nocera, D. G. “Spectroscopic determination of proton position in the proton-coupled electron transfer pathways of donor-acceptor supramolecule assemblies.” J. Am. Chem. Soc. 2006, 128, 10474-10483. [link]

Dunetz, J. R.; Sandstrom, C.; Young, E. R.; Baker, P.; Van Name, S. A.; Cathopolous, T.; Fairman, R.; De Paula, J. C.; Åkerfeldt, K. S. “Self-Assembling porphyrin-modified peptides.” Org. Lett. 2005, 7, 2559-2561. [link]

Schwab, A. D.; Smith, D. E.; Rich, C. S.; Young, E. R.; Smith, W. F.; De Paula, J. C. “Porphyrin nanorods.” J. Phys. Chem. B 2003, 107, 11339-11345. [link]

 

Conference Presentations:

Nti, A.; Dimeglio, J. L.; Yap, Glen P. A.; Rosenthal, J.; Young, E. R.;
poster presented at the Gordon Research Conference: Electron Donor Acceptor Interactions, Newport, RI. July, 2012

“Ferrocenyl-amidinium compound as building block for aqueous proton-coupled electron transfer studies”

Young, E. R.; Costi, R.; Nocera, D. G.; Bulović, V.  

poster presented at the Gordon Research Conference: Renewable Energy, Renewable Energy: Solar Fuels, Ventura, CA. Jan, 2011

“Thin-film cobalt metal electrodes for formation of cobalt-based water oxidation catalyst (Co-Pi) and photo-assisted water oxidation on a silicon photoanode”

Costi, R.;Young, E. R.; Bulović, V.;  Nocera, D. G.

poster presented at the Gordon Research Conference: Renewable Energy, Renewable Energy: Solar Fuels, Ventura, CA. Jan, 2011

“Cobalt-based catalyst on protected low-bandgap semiconductor photoanodes for visible-light induced water oxidation”

Young, E. R.; Nocera, D. G.; Bulović, V.  

oral presentation at the 240th ACS National Meeting, Boston, MA, Aug., 2010

“Development of thin film cobalt metal anode as scaffold and Co2+ source for formation of cobalt-based water oxidation catalyst”

Young, E. R.; Rosenthal, J.; Nocera, D. G.

poster presented at the Gordon Research Conference: Electron Donor Acceptor Interactions, Newport, RI. July, 2008

“Positioning of asymmetric hydrogen-bonded interfaces with respect to MLCT-excited state localization mediates Dexter energy transfer dynamics”

Young, E. R.; Rosenthal, J.; Nocera, D. G.

oral presentation at the 235th ACS National Meeting, New Orleans, LA, April 2008

“Variation of the electron-transfer pathway to modulate proton-coupled  electron transfer kinetics and kinetic isotope effects”

Hodgkiss, J. M.; Damrauer, N. H.; Young, E. R.; Rosenthal, J.; Pressé, S.; Nocera, D. G.

poster presented at the Gordon Research Conference: Renewable Energy, Renewable Energy: Solar Fuels, Ventura, CA. Jan, 2007

“PCET in hydrogen-bonded donor–acceptor assemblies: Electronic coupling and the role of proton Fluctuations”.

Hodgkiss, J. M.; Damrauer, N. H.; Young, E. R.; Rosenthal, J.; Pressé, S.; Nocera, D. G.

poster presented at the Gordon Research Conference: Donor-Acceptor Interactions, Salve Regina University, RI. July, 2006

 “PCET in hydrogen-bonded donor–acceptor assemblies: Electronic coupling and the role of proton fluctuations”

Rosenthal, J.; Young, E. R.; Hodgkiss, J. M.; Nocera, D. G.

poster presented at the Gordon Research Conference: Electron Donor Acceptor Interactions, Newport, RI. July, 2006

“Spectroscopic determination of proton position in the PCET pathways of donor-acceptor supramolecule assemblies”

Sandstrom, C.; Young, E.; Baker, P.; Dunetz, J.; Fairman, R.; Johnson, K.; de Paula, J.; Akerfeldt, K.

poster presented at the 223th ACS National Meeting, Orlando, FL, April 2002

“Novel porphyrin-peptide designs for biomaterials research”