报告摘要:
Bimetallic catalyst is one of the main categories of metal catalysts due to itstunability of electronic and geometric structures through alloying a second metal. The integration of a second metal creates many opportunities in varying surface structure and composition of metal catalysts toward a best catalytic performance.Fundamental studies of surface chemistry are critical for understanding their catalytic performances. We revealed the massive restructuring of bimetallic nanocatalyts under reaction conditions by using ambient pressure X-ray photoelectron spectroscopy. In addition, as a single event of heterogeneous catalysis is performed on a specific site at a solid-liquid or solid-gas interface, the chemistry and structure of catalyst surfaces at atomic or nano scale is critical for understanding catalysis at molecular or atomic level. Surface defects aretypically active sites for a catalysis event due to their local electronic states and coordination environment. Recentstudies showed the restructuring of step sites under different pressures by using high pressure STM. I will discuss the driving forces for the restructuring of composition and evolution of oxidation state of bimetallic nanoparticle catalysts and the geometricrestructuring of catalyst surfaces under reaction conditions or during catalysis.

报告人简介：
Franklin (Feng) Tao graduated from the Princeton University in 2006 with a PhD degree in chemistry. After two years’ of postdoctoral study with Professor Gabor A. Somorjai at Berkeley, he joined University of Notre Dame and is currently a Tenure-track Assistant Professor of Chemistry there. The research projects of Franklin (Feng) Tao group are in the interdisciplinary field of heterogeneous catalysis, nanoscience, analytical chemistry, materials chemistry, and surface science. His group focuses on important catalysis at nanoscale involved in energy harvest and conversion, pollution control, and environmental remediation. The goal of his research projects is to develop efficient nanocomposite catalytic systems using syntheses that build on the atomic level information obtained from our operando studies. Prof. Tao has published 66 papers in Science, Nano Letters, Langmuir, etc.