Ferrous Centers Confined
on Core–Shell Nanostructures
for Low-Temperature CO Oxidation
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Abstract
A noble metal (NM) can stabilize monolayer-dispersed
surface oxide
phases with metastable nature. The formed “oxide-on-metal”
inverse catalyst presents better catalytic performance than the NM
because of the introduction of coordinatively unsaturated cations
at the oxide–metal boundaries. Here we demonstrate that an
ultrathin NM layer grown on a non-NM core can impose the same constraint
on the supported oxide as the bulk NM. Cu@Pt core–shell nanoparticles
(NPs) decorated with FeO patches use much less Pt but exhibit performance
similar to that of Pt NPs covered with surface FeO patches in the
catalytic oxidation of CO. The “oxide-on-core@shell”
inverse catalyst system may open a new avenue for the design of advanced
nanocatalysts with decreased usage of noble metals