Thursday, March 6, 2014
3:00 PM - 4:00 PM
Ryan Hall, Ryan 4003
2190 Campus Drive
Evanston, IL 60208 map it
Audience: Faculty/Staff - Student - Post Docs/Docs - Graduate Students
Dr. Choi, of the Chemistry department at the University of Wisconsin-Madison, will visit Northwestern to deliver an ANSER seminar entitled, "Materials Chemistry via Electrochemistry: Electrochemical Synthesis of Electrode Materials with Controlled Architectures for Use in Solar Energy Conversion."
Harvesting energy directly from sunlight as nature accomplishes through
photosynthesis is a very attractive and desirable way to solve the energy challenge. Many efforts have been made to find appropriate materials and systems that can utilize solar energy to produce chemical fuels. One of the most viable options is the construction of a photoelectrochemical cell that can reduce water to H2 or CO2 to carbonbased molecules. For successful construction of photoelectrochemical cells, simultaneous developments of photoelectrodes, which will efficiently capture photons to generate and separate electron-hole pairs, and catalysts, which will facilitate the use of photongenerated electrons and holes for desired interfacial charge transfer reactions, are necessary. Furthermore, optimally interfacing photoelectrodes and catalysts is critical because the photoelectrode/catalyst interface can govern the overall efficiency of the integrated photoelectrode system. However, our understanding of the photoelectrode/catalyst interfaces has been limited because not many systematic investigations on the assembly of photoelectrodes and catalysts were reported.
Our research group has been developing new electrochemical synthetic strategies to produce semiconductor electrodes and catalysts with various compositions and architectures. In this presentation, we will discuss our most recent progress made in constructing photoelectrodes and new strategies to interface photoanodes with oxygen evolution catalysts. The systems we will discuss include a BiVO4-based photoanode that achieves a current density of 2.73 mA/cm2 for solar water splitting in a stable manner under AM 1.5G, 100 mW/cm2 illumination using a record low applied bias of 0.6 V vs. RHE.
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