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 is an assistant professor in the Department of Chemistry at Purdue University. The Li group focuses on developing molecular insight into materials properties. The group develops new synthetic methods for molecularly-precise materials, utilizes spectroscopy and microscopy to characterize materials at an atomic level, and studies these materials in a variety catalytic and optoelectronic applications.
Seminar sponsored by the Department of Chemistry and Biochemistry.