Table 1: Comparison of mass and specific activities for ORR and Pt electrochemical surface area of the different catalysts. All these three Pt NP/TiO2 catalysts show better mass and specific activity than those of the state-of-the-art commercial Pt/C catalyst.

Catalyst Mass activity at 0.9 V A/mg Pt Electrochemical-specific surface area m2/g Specific activity at 0.9 V μA/cm2 Pt PtNP/C (E-TEK) 30 wt% Pt 0.080 57 140 PtNP-NbTiO2 10 wt% Pt 0.092 40 228 PtNP-NbTiO2 20 wt% Pt 0.082 37 223 PtNP-NbTiO2 40 wt% Pt 0.082 47 175