EDS mapping of in-situ TEM gas-heating experiments

Characterization of cobalt in CoPt nanocatalysts in oxidation-reduction conditions.

Recently, researchers from the University of Pennsylvania, Stony Brook University, Harvard University, and Brookhaven National Laboratory conducted an in situ TEM study using Hummingbird Scientific’s in-situ TEM Gas Heating holder system to characterize Co2Pt3 nanoparticles supported on carbon. They studied the dynamical restructuring effects at the atomic scale of these catalysts during in-situ oxidation and reduction.

With Improved high accuracy EDS mapping with less background at the highest temperatures, Hummingbird Scientific’s in-situ TEM Gas Heating holder also minimizes drift to the point that one can collect data without drift-correction.

 (a) HAADF-STEM image: The red box indicates the region surveyed with EDS. (b) EDS map showing the distribution of Co and Pt within a single Co2Pt3 particle. Co is segregated on the surface. Individual elemental maps in (c) and (d) show that the Co and Pt signals overlap, indicating mixed CoPt in the particle bulk. Copyright © 2021 American Chemical Society

The work presented here using the Gas Cell TEM holder shows a unique methodology to perform controlled monitoring of high-temperature corrosion processes and the ambient conditions.

Reference: Alexandre C. Foucher, Nicholas Marcella, Jennifer D. Lee, Daniel J. Rosen, Ryan Tappero, Christopher B. Murray, Anatoly I. Frenkel, and Eric A. Stach “Structural and Valence State Modification of Cobalt in CoPt Nanocatalysts in Redox Conditions” © 2021 American Chemical Society. Full Paper

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