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Structural evolution of Pt NPs under different environmental conditions. Morphology of a Pt NP in vacuum (a) and in different gaseous environments, that is, (b,d) in 5% H2 in Ar; (c,e) in O2, all at 300 °C. The atoms are presented in different colors, according to the type of surface facet: blue = {100}, pink = {110}, purple = {111}, gray = higher index.
