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Dr. Julio D’Arcy, Washington University at St. Louis – Materials Science Faculty Search Seminar

November 16, 2021 @
12:15 p.m.
- 1:15 p.m. Eastern Time
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Speaker: Dr. Julio D’Arcy, Ph.D.
Department of Chemistry
Washington University at St. Louis
Title:  Vapor-Phase Synthesis of Organic Semiconductors for Enhancing Energy Storage Applications
This work explores paths that control interfacial molecular interactions responsible for the formation of conducting polymer nanostructures while pinpointing synergistic mechanisms in oxidative radical polymerization and Fe3+ solution hydrolysis. We study vapor phase polymerization, droplet evaporative self-assembly and solid-state dissolution as structure-directing tools for catalyzing the evolution of organic conjugated backbones and depositing conducting polymer coatings of high electronic conductivity (3500 S/cm). Findings show that dissolution of Hematite (α-Fe2O3) as well as in-situ growth of rod-shape Akageneite (β-FeOOH) and 2D-sheet iron oxychloride (FeOCl) nanostructures control polymer nucleation during oxidative radical polymerization enabling design of core/shell inorganic/organic nanostructured composites. We take advantage of Hematite present in a common masonry construction material, fired-red brick, to integrate poly(3,4-ethylenedioxythiophene) (PEDOT) nanofibers within a brick’s inorganic microporous matrix. PEDOT stores electrochemical energy via a reversible doping mechanism. A PEDOT-brick supercapacitor shows an areal capacitance of 0.868 F/cm2 and an areal energy density of 121 µWh/cm2 calculated from galvanostatic charge-discharge measurements. Gel electrolyte and epoxy seal enables 10,000 charge-discharge cycles with a ~90% capacitance retention; connecting three devices extends the voltage window to 3.6 V. We control the thickness of a polymer coating, the active electrochemical surface area of a brick electrode and develop devices that can be readily scaled up and modularized for powering microdevices embedded within a wall.
Host: Professor Luis Smith
Time: 12:15pm
Sackler Sciences Center
Johnson Auditorium S120
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November 16, 2021
12:15 p.m. - 1:15 p.m.