Fiber-like nanostructured Ti4O7 used as durable fuel cell catalyst support in oxygen reduction catalysis

We report on the successful synthesis of fiber-like nanostructured Ti4O7 (NS-Ti4O7) by multistep method. The specific surface area of this NS-Ti4O7 was 26 m(2) g(-1). The synthesized NS-Ti4O7 was platinized and characterized by X-ray diffraction (XRD), transmission electron microscopy (TEM), high-resolution TEM (HRTEM), X-ray photoelectron spectroscopy (XPS) and electrochemical testing. It was found that the monodispersed Pt nanoparticles supported on NS-Ti4O7 with a uniform size of 4.8 nm. The prepared Pt/NS-Ti4O7 catalysts exhibited superior durability as well as enhanced Pt mass activity in comparison to commercial Pt/XC-72 catalyst. After undergoing accelerated durability tests (ADT), the oxygen reduction reaction (ORR) mass activity of Pt/NS-Ti4O7 was nearly thirty times higher than that of Pt/XC-72. The superior durability of Pt/NS-Ti4O7 is attributed to the high stability of Ti4O7 and the strong metal-support interaction between Pt and Ti4O7.