MSE Seminar Speaker: Meilin Liu, GA Tech University
Friday, April 20, 2018
2110 Chem/Nuc Engineering Building
Speaker: Dr. Meilin Liu, Professor & Associate Chair of Materials Science & Engineering at Georgia Institute of Technology
Title: Surface Modification and In Situ/Operando Characterization of Electrodes for Energy Storage and Conversion
The performances of electrochemical systems are often limited by the charge and mass transfer along surfaces and across interfaces - the most active sites for chemical and electrochemical reactions. Fundamental understanding of the rate-limiting steps is vital to achieving rational design of novel electrode materials or structures with enhanced energy and power density. This presentation will highlight some recent advances in surface modifications and characterization of electrodes in energy storage and conversion systems. Surface enhanced Raman spectroscopy (SERS) has been used for probing and mapping new phases and reaction intermediates on electrode surfaces under or near operating conditions. In particular, it is demonstrated that SiO2 shell isolated Ag nanoparticles have excellent chemical and thermal robustness and stability for in situ SERS study of electrode materials under in situ or operando conditions, providing valuable information on reaction intermediates or structural changes that critically influence the performance and stability of the electrodes. Further, synchrotron-based X-ray absorption spectroscopy (XAS) and XPS has been used to characterize the local atomistic structure variation and oxidation state changes of electrode surfaces and interfaces, which may critically affect the activation or degradation processes of electrodes. These experimental studies, together with modeling and simulation, have helped us to gain important insights into the mechanisms of chemical and energy transformation, electro-catalytic reactions, and degradation processes, providing valuable guidelines for rational design of new electrode materials, surfaces, and interfaces with desired functionalities.
Meilin Liu is the B. Mifflin Hood Chair Professor, Regents' Professor, and Associate Chair of the School of Materials Science and Engineering and Co-Director of the Center for Innovative Fuel Cell and Battery Technologies at Georgia Institute of Technology, Atlanta, Georgia. He received his MS and PhD from University of California at Berkeley. His research interests include design, fabrication, in situ characterization, and modeling of membranes, thin films, coatings, porous electrodes, and devices for electrochemical energy storage and conversion, aiming at achieving rational design of novel materials and structures with unique functionalities. Dr. Liu holds ~27 U.S. patents, co-organized 11 international symposia or workshops, co-edited 7 proceedings volumes, delivered ~180 invited lectures around the world, and published ~430 refereed articles. His publications have been cited over 30,000 times in Google Scholar with an h-index of 90. Dr. Liu is a fellow of the American Ceramic Society (ACerS) and the Electrochemical Society (ECS). He was the winner of many professional awards, including Outstanding Faculty Research Author Award (Georgia Tech, 2013 and 1997), Ross Coffin Purdy Award (ACerS, 2010), Outstanding Achievement in Research Program Development Award (Georgia Tech, 2003), Sustained Research Award (Sigma Xi, 2003), and National Young Investigator Award (NSF, 1993-98).