Research Article

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

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.