Highly Stable and Active Pt/Nb-TiO₂ Carbon-Free Electrocatalyst for Proton Exchange Membrane Fuel Cells

Figure 3

TEM images of Pt nanoparticles deposited on hollow Nb-TiO₂ nanosphere supports with different Pt loadings. (a) 10 wt% and (b) 40 wt%.

(a)

(b)