- Sagar Prabhudev, McMaster University, Toronto, Canada
Scanning transmission electron microscopy (STEM) has always played an important role in the development of new materials. Particularly in the case of catalysis, where an atomic-level understanding of catalyst structures is central to the development of future energy conversion devices such as fuel cells, STEM provides an exhaustive tool kit for a reliable estimation of their bulk/surface-structures, morphological evolution, and bonding analyses in the form of series of imaging (HAADF, ADF, BF, ABF) and spectroscopic techniques (low-loss/core-loss EELS). The speaker will present recent examples in the study of Pt-based (and several other) nano-alloy catalysts, highlighting the use of ex situ/in situ STEM-based methods in probing the interplay between surface segregation and atomic ordering. The speaker will highlight recent advancements in the area of low-dose imaging (e.g., 4D-STEM) in view of their potential applications to catalysis.