Short Course #2 Advanced Microscopy Methods for Studying PEM Fuel Cell Materials
Karren L. More, Instructor
Please visit the Toronto meeting page for registration information. Early-Bird Registration rates are in effect until April 12, 2013. See a list of all Short courses offered at the Toronto meeting.
The um- to sub-Ň-scale structural and chemical characterization of fuel cell material constituents via advanced electron microscopy techniques plays an integral role in elucidating the critical materialís degradation mechanisms contributing to fuel cell performance loss. Such techniques include atomic-scale imaging via aberration-corrected scanning transmission electron microscopy (STEM) coupled with the ability to resolve compositional/chemical changes at the atomic scale using energy dispersive spectroscopy (EDS) and/or electron energy loss spectroscopy (EELS). Recently, the development of specialized holders for conducting novel in-situ microscopy experiments (such as liquid STEM, electrochemistry, gas-flow reactions, biasing, etc.) combined with high-resolution imaging and microanalysis has enhanced the ability to study critical structural changes to individual materials constituents comprising fuel cell membrane electrode assemblies under relevant environmental conditions.
The primary microscopy and spectroscopy techniques available today, which are used to study fuel cell materials, will be summarized and described in detail. Advanced methodologies for quantifying critical structural changes related to particular fuel cell testing protocols and materials degradation phenomena will be described and are supported with specific materials-specific characterization studies.
About the Instructor
Karren L. More received her Ph.D. in Materials Science and Engineering from North Carolina State University in 1992 and has primarily focused her research on the application of high-resolution electron microscopy to materials science research. She has been a research staff member at the Oak Ridge National Laboratory (Materials Science and Technology Division) for 25 years and was named Group Leader for the Microscopy Group in 2006. Her research during her tenure at ORNL has focused on the microstructural characterization of materials for automotive applications, distributed energy, heavy-duty vehicles, etc. Over the past 8 years, she has conducted innovative research on polymer electrolyte membrane (PEM) fuel cell membrane electrode assemblies (MEAs) and, most importantly, PEM fuel cell catalysts using high-resolution scanning transmission electron microscopy (STEM) as part of DOEís Fuel Cell Technologies As a result of her microscopy expertise and the unique collection of TEM/STEM instruments at ORNL, she has collaborated on numerous automotive-related materials studies and PEM fuel cell durability and aging studies with other national laboratories and leading materials, PEM fuel cell, and MEA manufacturers. In 2006, Dr. More was recognized for her research and awarded the DOE Hydrogen Programís R&D Award. Dr. More has accumulated over 150 publications, 600 citations, and 40 invited presentations and is a Fellow of the American Ceramic Society.