03/27/17 -11:00 AM to 12:00 PM
Special Seminar: Professor Jahan Dawlaty
"Light, Electrons, Protons: Lessons from Model Systems and Potentials for Photocatalysis"
The inspiration for this talk comes from the photoelectrochemical interface, which is a place rich with unknowns and unrealized potentials. Electrons are excited by light either in the electrode or in the adsorbed molecules, charges traverse the electrode-electrolyte interface, protons flow from the bulk to complete redox reactions, and interfacial electric fields develop to balance chemical potential differences between the opposing phases. In this talk, the complex chemistry at the interface will be used as a point of reference to motivate several chemical dynamics studies in small molecules, solids, and interfaces with the goal of generating new directions and ideas for understanding and driving interfacial reactions. New concepts that will be discussed are basicity in the excited state, solvation near an interface, electronic-vibrational dynamics in a solid made of a redox couple, and influencing proton conductivity with light. Several avenues on how to use this knowledge will be proposed.
The focus of Jahan Dawlaty's research is understanding the dynamics of photocatalytic reactions. In particular, his research group is interested in reactions where the absorbed energy from light is stored in the chemical products. They use a variety of tools, in particular, ultrafast pulsed laser spectroscopy, to understand the principles of photocatalysis. They are interested in mechanisms of electron and proton transfer, proton-coupled electron transfer, and interfacial charge transfer in a variety of light-driven redox reactions. They seek to answer what makes a photocatalytic reaction work, and how it can be optimized, and harnessed for light harvesting.