title: Ordered bilayer ruthenium-platinum core-shell nanoparticles as carbon monoxide-tolerant fuel cell catalysts.
abstract: Fabricating subnanometre-thick core-shell nanocatalysts is effective for obtaining high surface area of an active metal with tunable properties. The key to fully realize the potential of this approach is a reliable synthesis method to produce atomically ordered core-shell nanoparticles. Here we report new insights on eliminating lattice defects in core-shell syntheses and opportunities opened for achieving superior catalytic performance. Ordered structural transition from ruthenium hcp to platinum fcc stacking sequence at the core-shell interface is achieved via a green synthesis method, and is verified by X-ray diffraction and electron microscopic techniques coupled with density functional theory calculations. The single crystalline Ru cores with well-defined Pt bilayer shells resolve the dilemma in using a dissolution-prone metal, such as ruthenium, for alleviating the deactivating effect of carbon monoxide, opening the door for commercialization of low-temperature fuel cells that can use inexpensive reformates (H2 with CO impurity) as the fuel.
authors.affiliation: Department of Chemistry, Brookhaven National Laboratory, Building 555, Upton, New York 11973, USA.
authors.forename: Yu-Chi
authors.initials: YC
authors.lastname: Hsieh
authors.forename: Yu
authors.initials: Y
authors.lastname: Zhang
authors.forename: Dong
authors.initials: D
authors.lastname: Su
authors.forename: Vyacheslav
authors.initials: V
authors.lastname: Volkov
authors.forename: Rui
authors.initials: R
authors.lastname: Si
authors.forename: Lijun
authors.initials: L
authors.lastname: Wu
authors.forename: Yimei
authors.initials: Y
authors.lastname: Zhu
authors.forename: Wei
authors.initials: W
authors.lastname: An
authors.forename: Ping
authors.initials: P
authors.lastname: Liu
authors.forename: Ping
authors.initials: P
authors.lastname: He
authors.forename: Siyu
authors.initials: S
authors.lastname: Ye
authors.forename: Radoslav R
authors.initials: RR
authors.lastname: Adzic
authors.forename: Jia X
authors.initials: JX
authors.lastname: Wang