Atomic-Resolution Spectroscopic Imaging of Ensembles of Nanocatalyst Particles Across the Life of a Fuel Cell
ABSTRACT: The thousand-fold increase in data-collection speed
enabled by aberration-corrected optics allows us to overcome an
electron microscopy paradox: how to obtain atomic-resolution chemical
structure in individual nanoparticles yet record a statistically significant
sample from an inhomogeneous population. This allowed us to map
hundreds of Pt−Co nanoparticles to show atomic-scale elemental
distributions across different stages of the catalyst aging in a protonexchange-
membrane fuel cell, and relate Pt−shell thickness to treatment,
particle size, surface orientation, and ordering.
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