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Transcript
Switchable nanocatalysts: using ferroelectric oxides to control surface catalysis Andrew M. Rappe The Makineni Theoretical Laboratories Department of Chemistry Department of Materials Science and Engineering University of Pennsylvania Supported catalysts are crucial to modern chemical industry. Reaction rates and product distributions are controlled by the choice of catalyst, support, and promoters. After fabrication however, control of the catalyst reactivity is decidedly limited. In this talk, I will describe the properties of ferroelectric oxides, and their potential use in switchable nanocatalysts. The bulk and surface properties of ferroelectrics will be illustrated, highlighting their response to surface chemisorption and external electric fields. A model system will be described in which the catalytic activity of a supported metal can be rapidly and reversibly changed through the application of a transient voltage pulse to the substrate.