MSE Special Speaker: Dr. MiaoFang Chi, Oak Ridge National Laboratory

All dates for this event occur in the past.

2040 Fontana Labs
140 W. 19th Ave.
Columbus, OH 43210
United States

Emerging Scanning Transmission Electron Microscopy (STEM) for Energy Materials Research 

An ever-increasing societal demand calls for sustainable solutions to converting and storing energy. However, designing next-generation energy conversion and energy storage faces numerous challenges, many of which are related to interfaces. Elucidating interfacial phenomena in these energy systems requires knowledge, not only of atomic-scale structure and chemistry, but also of local charge distribution and ion transport that are difficult to probe with existing characterization techniques. Several emerging scanning transmission electron microscopy (STEM) techniques, such as four-dimensional (4D)-STEM, monochromated EELS (electron energy loss spectroscopy), atomic-scale cryogenic and in situ environmental microscopy, allow the behavior of electrons, ions, and atoms to be probed, opening opportunities to tackle complex dynamic interfacial questions. In this talk, I will demonstrate how we advance and utilize these techniques to (1) reveal the origin of unexpected dendrite growth within all-solid-state batteries, (2) probe local ion transport behavior at interfaces and grain boundaries, and (3) map anionic electrons in electrides and measure charge distributions at electrode-electrolyte interfaces. Perspectives for the future advancements of these new STEM techniques for research into emerging energy and quantum materials will also be provided.

Bio

Miaofang Chi

Miaofang Chi is a senior staff scientist at the Center for Nanophase Materials Sciences (CNMS) at Oak Ridge National Laboratory (ORNL). She received her Ph.D. in Materials Science and Engineering from the University of California, Davis, in 2008. Her primary research interests are understanding interfacial charge transfer and ion transport behavior in energy and quantum materials and systems by advancing and employing novel electron microscopy techniques. She was awarded the Burton Medal by the Microscopy Society of America (2016) and the Kurt Heinrich Award from the Microanalysis Society (2019). She received the ORNL Director’s Award for Outstanding Individual Accomplishment in Science and Technology (2015) and was named to Clarivate’s list of Highly Cited Researchers in 2018 and 2020. She has published more than 200 peer-reviewed journal papers. She serves on the editorial board of Materials Today and served as the award committee chair for Microscopy Society of America (MSA).

Zoom option:

https://osu.zoom.us/j/99691734565?pwd=eTJyS0ZPaHh3SkRRQU1oTFV1ZEc0dz09

Meeting ID: 996 9173 4565

Password: 340635