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¶àл´ó¼ÒÔĶÁÒýÓã¡ http://dx.doi.org/10.1021/nl203975u 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¨CCo nanoparticles to show atomic-scale elemental distributions across different stages of the catalyst aging in a proton-exchange-membrane fuel cell, and relate Pt¨Cshell thickness to treatment, particle size, surface orientation, and ordering. [ Last edited by zhangwj on 2011-12-20 at 11:25 ] |
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