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In these Pt particles, more than 90% of atoms are located on the surface and
the atomic coordination number of ∼1  nm  particles  is  smaller  than  that  in  larger  nanoparticles  (e.g.  12 in  a  fcc  lattice)  which  has  a  substantial  fraction  of  the  atoms  in  the bulk  inducing  distinctly  different  catalytic  performance.

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