Promotion of oxygen reduction reaction durability of carbon-supported PtAu catalysts by surface segregation and TiO₂ addition.

Highly effective carbon supported-Pt75Au25 catalysts for oxygen reduction reaction (ORR) are prepared though titanium dioxide modification and post heat treatment. After accelerated durability test (ADT) of 1700 cycles, the ORR activity of PtAu/C catalysts modified by TiO2 and air heat treatment is 3 times higher than that of the commercial Pt/C. The enhancement of ORR activity is attributed to surface and structural alteration by air-induced Pt surface segregation and lower unfilled d states.

Preparation of Au/TiO2 for catalytic preferential oxidation of CO under a hydrogen rich atmosphere at around room temperature.

Au/TiO2 prepared in a pH adjusted gold solution by a deposition-precipitation method can possess high activity and stability for selective CO oxidation in a H2 rich stream at ambient temperature.