Ferroelectrics and their potential to solve the most fundamental challenges of catalysis

Speaker: 
Arvin Kakekhani
Seminar Date: 
Friday, September 18, 2015 - 12:00pm
Location: 
BECTON SEMINAR ROOM See map
Prospect Street
New Haven, CT

Abstract: The effect of ferroelectric polarization on surface physics and chemistry has been studied for more than six decades. It is shown that ferroelectric polarization can affect the adsorption energies, adsorption modes, and reaction rates of a variety of polar and non-polar molecules. Surface catalysis based on transition metals and their alloys has been one of the most important research fields in theoretical and experimental catalysis and chemistry. Despite, enormous impacts on daily lives, e.g., helping to overcome the world’s hunger problem in the early 20th century, by introducing the Haber-Bosch process to efficiently synthesize ammonia, transition metal-based catalysis now faces some fundamental limitations. As a result of these limitations, some of the most important chemical reactions still lack an efficient catalyst e.g., selective partial oxidation of methane to methanol, or NO direct decomposition. We suggest that ferroelectrics may make an important contribution in this regard. Ferroelectric surfaces have an added degree of freedom which is the direction of the polarization below the surface. Exploiting this tunable degree of freedom, results in a dynamic control over the surface chemistry, which can potentially free us from the fundamental limitations posed on catalytic efficiency by the Sabatier principle, and scaling relations. As a specific example, I will discuss using a class of ferroelectric-based catalysts to efficiently catalyze NO direct decomposition (2NON2+O2).

Host: 
Professor Eric Altman
Seminar Announcement Brochure: 

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