Time：July 10 2010，AM 10:00
Location：Meeting Room of Aerospace Catalysis Building on Floor 3Dr. Zhi Liu
University of California, Berkeley
Characterization and control of heterogeneous chemical reactions at the gas-solid and liquid-solid interfaces (heterogeneous catalysis, battery, fuel cell, nano-structure growth and corrosion); In-situ electron and x-ray spectroscopy.
• Ph. D in Physics, Stanford University, 2005; Thesis title: “Surface characterization of semiconductor photocathode structures” ; M. S. in Electrical Engineering, Stanford University, 2003; B. S. in Physics and B. S. in Atmospheric Science, Beijing University, 1994.
• Staff Scientist, Advanced Light Source Division, Lawrence Berkeley National Lab., 2007 - present.
• Postdoctoral Research Associate, Shen group, Stanford physics department, 2006 - 2007.
• Postdoctoral Research Associate, Stanford Synchrotron Radiation Laboratory, 2005 - 2007.
Most of the long-term changes, such as corrosion and the degradation of catalysts, fuel cell, and batteries, are determined by slow surface chemical reactions. In-situ surface sensitive tools are ideal in detecting the small changes at the gas-solid/liquid-solid interface. By shrinking the space, we can evaluate and predict the long-term, large-dimension changes within a reasonable time span.
The newly designed ambient pressure x-ray photoelectron spectroscopy endstations at ALS based on differentially pumped electron energy analyzers along with other synchrotron based techniques have been recognized by scientific communities beyond the ALS as an important in-situ tool to study catalysis, electrochemical cells, and other energy related fields. I will give an overview of science projects at BL9.3.2 in heterogeneous catalysis and electrochemical cell (fuel cell and battery).
Figure 1. Using AP-XPS, we can investigate in-situ the solid oxide fuel cell in its operational condition (700C, 1torr of H2+H2O) and gain a microscopic and chemically-specific understanding of electrochemical interfaces, especially the electrode-electrolyte-gas three phase boundary.