title: In-situ confined growth of monodisperse pt nanoparticle@graphene nanobox composites as electrocatalytic nanoreactors.
abstract: Monodisperse Pt nanoparticles (NPs) studded in a three-dimensional (3D) graphene nanobox are successfully synthesized through a simple in-situ confined growth route for the first time. The nano-zeolite A was used as a 3D substrate for in-situ growth of tri-layered graphenes on the crystal-surfaces, meanwhile, the inner micropores of which can also be utilized for the confined growth of Pt nanoparticles. The graphene sheets are curved on the edges to form a 3D hollow box morphology, where the monodisperse Pt nanoparticles are homogeneously studded on the inner surfaces. Moreover, the Pt content can be regulated from ∼8 to 50 wt%, and the particle size can be tuned from 2-5 nm by varying the pristine Pt-ion loading amount and CVD temperature. The Pt NP@graphene nanoboxes possess not only large pore volumes to effectively accommodate large amounts of oxygen, but also supply excellent electrical conductivity for the fast transfer of electrons (∼3.96 e(-)), resulting in a high efficiency (175 mA/mg Pt) and long-term stability (above 1000 cycles) for the oxygen reduction reaction.
authors.affiliation: Department of Chemistry, Shanghai Key Laboratory of Molecular Catalysis and Innovative Materials, Laboratory of Advanced Materials, Fudan University, Shanghai, 200433, P. R. China.
authors.forename: Yingying
authors.initials: Y
authors.lastname: Lv
authors.forename: Yin
authors.initials: Y
authors.lastname: Fang
authors.forename: Zhangxiong
authors.initials: Z
authors.lastname: Wu
authors.forename: Xufang
authors.initials: X
authors.lastname: Qian
authors.forename: Yanfang
authors.initials: Y
authors.lastname: Song
authors.forename: Renchao
authors.initials: R
authors.lastname: Che
authors.forename: Abdullah M
authors.initials: AM
authors.lastname: Asiri
authors.forename: Yongyao
authors.initials: Y
authors.lastname: Xia
authors.forename: Bo
authors.initials: B
authors.lastname: Tu
authors.forename: Dongyuan
authors.initials: D
authors.lastname: Zhao
keywords: ORR; Pt; fuel cells; graphene; nanocomposites; zeollites