In
this study, molybdenum doping of anatase TiO2, used
as a Pt catalyst support, both augments resistance against the carbon
corrosion that commonly occurs in oxygen reduction reaction (ORR)
Pt/C catalysts and promotes the generation of oxygen vacancies that
allow better electron transfer from the nanosupport to Pt, thereby
facilitating the oxygen dissociation reaction. The effects of the
oxygen vacancies within the Mo-doped TiO2 nanosupport on
ORR activity and stability are investigated both experimentally and
by density functional theory analysis. The mass activity of Pt-supported
molybdenum-doped anatase TiO2 is shown to be 9.1 times
higher than that of a commercial standard Pt/C catalyst after hydrogen
reduction. The oxide-supported nanocatalysts also show improved stability
against Pt sintering under during cycling, because of strong metal–support
interactions.
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