Catalysis under shell: Improved CO oxidation reaction confined in Pt@h-BN core–shell nanoreactors
core-shell, CO oxidation, Pt, hexagonal boron nitride, nanoreactor
ABSTRACT Core–shell nanostructures consisting of active metal cores and protective shells often exhibit enhanced catalytic performance, in which reactants can access a small part of the core surfaces through the pores in the shells. In this study, we show that Pt nanoparticles (NPs) can be embedded into few-layer hexagonal boron nitride (h-BN) overlayers, forming Pt@h-BN core–shell nanocatalysts. The h-BN shells not only protect the Pt NPs under harsh conditions but also allow gaseous molecules such as CO and O2 to access a large part of the Pt surfaces through a facile intercalation process. As a result, the Pt@h-BN nanostructures act as nanoreactors, and CO oxidation reactions with improved activity, selectivity, and stability occur at the core–shell interfaces. The confinement effect exerted by the h-BN shells promotes the Pt-catalyzed reactions. Our work suggests that two-dimensional shells can function as robust but flexible covers on nanocatalyst surfaces and tune the surface reactivity.
Tsinghua University Press
Mengmeng Sun,Qiang Fu,Lijun Gao,Yanping Zheng,Yangyang Li,Mingshu Chen,Xinhe Bao, Catalysis under shell: Improved CO oxidation reaction confined in Pt@h-BN core–shell nanoreactors. NanoRes.2017, 10(4): 1403–1412