title: 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 proton-exchange-membrane fuel cell, and relate Pt-shell thickness to treatment, particle size, surface orientation, and ordering.
authors: Department of Physics, Cornell University, Ithaca, New York 14853, USA.
authors: Huolin L
authors: HL
authors: Xin
authors: Julia A
authors: JA
authors: Mundy
authors: Zhongyi
authors: Z
authors: Liu
authors: Randi
authors: R
authors: Cabezas
authors: Robert
authors: R
authors: Hovden
authors: Lena Fitting
authors: LF
authors: Kourkoutis
authors: Junliang
authors: J
authors: Zhang
authors: Nalini P
authors: NP
authors: Subramanian
authors: Rohit
authors: R
authors: Makharia
authors: Frederick T
authors: FT
authors: Wagner
authors: David A
authors: DA
authors: Muller
mesh_terms: D001674:Bioelectric Energy Sources; D002384:Catalysis; D007089:Image Enhancement / Q000379:methods*; D008422:Materials Testing / Q000379:methods*; D018625:Microscopy, Atomic Force / Q000379:methods*; D049329:Nanostructures / Q000737:chemistry* / Q000648:ultrastructure*; D013057:Spectrum Analysis / Q000379:methods*