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

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 m^2/g	Specific activity at 0.9 V μA/cm^2 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