  With a focus on platinum nanoparticles of different sizes (diameter of 1-9
nm) and shapes, we sequence their geometrical genome by recording the relative
occurrence of all the non equivalent active site, classified according to the
number of neighbours in their first and second coordination shell. The
occurrence of sites is morphology and size dependent, with significant changes
in the relative occurrence up to 9 nm. Our geometrical genome sequencing
approach is immediately transferable to address the effects of the
morphological polydispersivity in size-selected samples and the influence of
temperature, including ionic vibrations and thermal activated processes. The
proposed geometrical genome forecasts an enhancement of the catalytic reduction
of molecular oxygen on stellated and anisotropic platinum twinned
nanoparticles, with their shortest axes of ~2 nm, and an irreversible
disruption of the Pt nanocatalyst's structure above 1000 K.
