We examined the durability of Pt sputtered onto TiO2 nanotubes (Pt/TONTs) using accelerated durability tests and extended fuel cell operation time. From the cyclic voltammograms, a threshold potential was found at 0.75 V, below which there was an oxide-free Pt surface that showed the best catalytic activity for the O-2 reduction reaction. The Pt/TONT catalyst was durable, as shown by only small amounts of degradation of the active surface area and power values. We suggest that the catalytic activity of Pt/TONT catalyst does not show any dissolution or agglomeration such as is well known for Pt on carbon supports.