Talks & Lectures
14 Sep 2018
ABS Building Room 301

Phase Evolution and Interfaces in Nano-Materials for Energy Storage

CEOE Seminar Series: Dong Su, Brookhaven National Laboratory

Dong Su
ABSTRACT

Advanced (scanning) transmission electron microscopy ((S)TEM) techniques has been intensively used to study materials for energy storage. Researchers are able to probe local structural and chemical information of electrode materials at a nanoscale resolution with TEM techniques including in-situ TEM and diffraction, HAADF-STEM and STEM-electron energy-loss spectroscopy (EELS).

This talk will cover our recent work on using in-situ and analytical TEM to characterize the conversion-reaction oxide material (Fe3O4) for electrode of lithium ion batteries [1-2] and Pt-based nanocatalysts for fuel cells [3]. The dynamical process of the redox reaction of Fe3O4 revealed by in-situ TEM may help us understand how reaction pathways affect batteries’ kinetic properties. On the other hand, strain coupling at interfaces is highlighted for its crucial roles in determining both the rate of electrochemical reaction and catalytic activity.

References:
  1. Visualizing non-equilibrium lithiation of spinel oxide via in situ transmission electron microscopy, He, et al., Nature Communications, 7:11441 (2016).
  2. Strain coupling of conversion-type Fe3O4 thin film for lithium ion battery, Hwang, et al. Angewandte Chemie, 56, 7813-7816 (2017).
  3. Biaxially strained PtPb/Pt core/shell nanoplate boosts oxygen reduction catalysis, Bu et al., Science, 354, 1410-1414(2016).
BIOGRAPHY

Su specializes in using advanced electron microscopy technique to study the structure-property relationship in energy related materials including catalysts, materials for battery electrode as well as functional oxide materials. He received both his Ph.D in condensed matter physics and B.S. in physics 1998 from Nanjing University, China. He did his postdoctoral research in EPFL Switzerland, University of Illinois at Urbana-Champaign and Arizona State University from 2004-2008. He has conducted research as an assistant scientist and scientist at the Center for Functional Nanomaterials at Brookhaven National Laboratory since 2008.

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