389505.fig.002a
(a)
389505.fig.002b
(b)
Figure 2: (a) TEM and (b) HRTEM images of Pt nanoparticles deposited on hollow Nb-TiO2 nanosphere supports with 20 wt% Pt loading. Pt NPs are single crystal, 4 nm in average size and uniformly dispersed on the surface of hollow Nb-TiO2 nanosphere supports.