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Materials Seminar-Prof. Christina Li, Purdue University

October 28 @ 12:05 pm - 1:05 pm

Tuning Active Sites in Catalytic Nanomaterials through Colloidal Synthesis

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Supported metal atoms and nanoparticles are found ubiquitously as heterogeneous catalysts for a wide variety of industrial, organic, and energy catalytic processes. The electronic and steric environment at the nanomaterial surface has a huge impact on the reactivity and selectivity of catalytic transformations occurring at surface active sites, but these properties are difficult to independently control through conventional materials synthetic methods. In this work, we develop molecularly-precise surface functionalization strategies in order to precisely tune both the ensemble geometry and redox properties of active site metal atoms. These strategies include 1) the adsorption of inorganic ligands on colloidal nanoparticle surfaces in order to synthesize monolayer and sub-monolayer core-shell catalysts, 2) control of bimetallic surface ensemble geometry to catalyze diastereoselective organic reactions, and 3) tuning the metal–sulfur coordination environment of single atoms supported on metal chalcogenide nanosheets for electrochemical catalysis. All of these strategies develop new structural frameworks for modulating the surface active site environment in order to access more reactive and selective nanomaterial catalysts.

Christina Li poster.pdf

Details

Date:
October 28
Time:
12:05 pm - 1:05 pm
Event Category:

Venue

Virtual in Zoom
53706 United States

Other

Meeting Type
Virtual