Inorganic Chemistry Seminar: Professor Michael Marshak, University of Colorado Boulder

Inorganic Chemistry Seminar: Professor Michael Marshak, University of Colorado Boulder
Date
Thu April 7th 2022, 4:00 - 5:00pm
Location
Sapp Center Lecture Hall

Inorganic Chemistry Seminar: Professor Michael Marshak, University of Colorado Boulder (Host: Matthew Kanan)

**This seminar is available for in-person attendance.**

"Redox Flow Batteries: Design and electrochemical performance of chelated metal complexes for grid-scale energy storage"

About the Seminar

Widespread adoption of renewable energy is limited by the lack of low-cost long-duration energy storage. Redox flow batteries (RFBs) are an attractive option to meet this energy storage need because their power and energy components can be scaled independently by storing energy with redox-active materials dissolved in solution. To date, RFB electrolytes have utilized expensive metals dissolved in corrosive acid or suffered from performance issues such as hydrogen generation, ion-crossover across the membrane, slow redox kinetics, and acidic operating conditions. Addressing these issues could enable RFBs to become a cost-effective and efficient energy storage system, allowing for wide-spread adoption of RFBs as large-scale energy storage sources, and therefore enable renewable energy to become a larger part of electric power production.

In this talk, a class of chelated metals is presented that could enable low-cost energy storage with flow batteries to be realized. Chelates related to ethylenediaminetetraacetate (EDTA) are shown to stabilize metal ions in aqueous solution at very reducing potentials while inhibiting degradation, improving solubility, and increasing electron transfer kinetics. The fundamental coordination chemistry and geometries of the particular metals and chelates are critical for battery stability, function, and performance.

About the Speaker

Michael Marshak is an assistant professor of chemistry at CU-Boulder and fellow at the Renewable and Sustainable Energy Institute (RASEI). Michael received his B.A. in Chemistry at Cornell University and his Ph.D. in Inorganic Chemistry at MIT. While at Cornell, he studied organometallic chemistry of early transition metals under the guidance of Prof. Peter Wolczanksi. These studies focused on olefin-alkylidene rearrangements and C–H bond activation using niobium, tantalum, and tungsten complexes. At MIT, he joined the lab of Prof. Daniel Nocera studying high-valent first-row transition metals. This research identified redox-activity in β-diketiminate ligands, nitrile insertion in metal-aryl bonds, and the spectrochemical properties of chromium (IV) siloxide. After completion of his graduate studies in 2012, Michael hiked 2668 miles from Mexico to Canada on the Pacific Crest Trail. Upon returning to Cambridge, he worked as a postdoctoral fellow with Profs. Michael Aziz, Roy Gordon, and Alán Aspuru-Guzik at Harvard University, where he helped to pioneer the use of organic materials called quinones for flow batteries, a promising new technology that can store massive quantities of energy on the electric grid. Flow batteries can enable greater use of renewable energy resources such as wind and solar by providing power when the sun isn’t shining and the wind isn’t blowing. In his free time, Michael enjoys being outdoors, preferably skiing, hiking, mountaineering, biking, or fishing.