title: NANOCATALYSTS. Platinum-based nanocages with subnanometer-thick walls and well-defined, controllable facets.
abstract: A cost-effective catalyst should have a high dispersion of the active atoms, together with a controllable surface structure for the optimization of activity, selectivity, or both. We fabricated nanocages by depositing a few atomic layers of platinum (Pt) as conformal shells on palladium (Pd) nanocrystals with well-defined facets and then etching away the Pd templates. Density functional theory calculations suggest that the etching is initiated via a mechanism that involves the formation of vacancies through the removal of Pd atoms incorporated into the outermost layer during the deposition of Pt. With the use of Pd nanoscale cubes and octahedra as templates, we obtained Pt cubic and octahedral nanocages enclosed by {100} and {111} facets, respectively, which exhibited distinctive catalytic activities toward oxygen reduction.
authors.affiliation: Wallace H. Coulter Department of Biomedical Engineering, Georgia Institute of Technology and Emory University, Atlanta, GA 30332, USA. State Key Laboratory of Physical Chemistry of Solid Surfaces, Collaborative Innovation Center of Chemistry for Energy Materials, and Department of Chemistry, Xiamen University, Xiamen, Fujian 361005, P. R. China.
authors.forename: Lei
authors.initials: L
authors.lastname: Zhang
authors.affiliation: Department of Chemical and Biological Engineering, University of Wisconsin-Madison, Madison, WI 53706, USA.
authors.forename: Luke T
authors.initials: LT
authors.lastname: Roling
authors.affiliation: Wallace H. Coulter Department of Biomedical Engineering, Georgia Institute of Technology and Emory University, Atlanta, GA 30332, USA. State Key Laboratory of Physical Chemistry of Solid Surfaces, Collaborative Innovation Center of Chemistry for Energy Materials, and Department of Chemistry, Xiamen University, Xiamen, Fujian 361005, P. R. China.
authors.forename: Xue
authors.initials: X
authors.lastname: Wang
authors.affiliation: School of Chemistry and Biochemistry, Georgia Institute of Technology, Atlanta, GA 30332, USA.
authors.forename: Madeline
authors.initials: M
authors.lastname: Vara
authors.affiliation: Center for Nanophase Materials Sciences, Oak Ridge National Laboratory, Oak Ridge, TN 37831, USA.
authors.forename: Miaofang
authors.initials: M
authors.lastname: Chi
authors.affiliation: Department of Physics, Arizona State University, Tempe, AZ 85287, USA.
authors.forename: Jingyue
authors.initials: J
authors.lastname: Liu
authors.affiliation: Wallace H. Coulter Department of Biomedical Engineering, Georgia Institute of Technology and Emory University, Atlanta, GA 30332, USA.
authors.forename: Sang-Il
authors.initials: SI
authors.lastname: Choi
authors.affiliation: School of Chemistry and Biochemistry, Georgia Institute of Technology, Atlanta, GA 30332, USA.
authors.forename: Jinho
authors.initials: J
authors.lastname: Park
authors.affiliation: Department of Chemical and Biological Engineering, University of Wisconsin-Madison, Madison, WI 53706, USA.
authors.forename: Jeffrey A
authors.initials: JA
authors.lastname: Herron
authors.affiliation: State Key Laboratory of Physical Chemistry of Solid Surfaces, Collaborative Innovation Center of Chemistry for Energy Materials, and Department of Chemistry, Xiamen University, Xiamen, Fujian 361005, P. R. China.
authors.forename: Zhaoxiong
authors.initials: Z
authors.lastname: Xie
authors.affiliation: Department of Chemical and Biological Engineering, University of Wisconsin-Madison, Madison, WI 53706, USA.
authors.forename: Manos
authors.initials: M
authors.lastname: Mavrikakis
authors.affiliation: Wallace H. Coulter Department of Biomedical Engineering, Georgia Institute of Technology and Emory University, Atlanta, GA 30332, USA. School of Chemistry and Biochemistry, Georgia Institute of Technology, Atlanta, GA 30332, USA. School of Chemical and Biomolecular Engineering, Georgia Institute of Technology, Atlanta, GA 30332, USA. younan.xia@bme.gatech.edu.
authors.forename: Younan
authors.initials: Y
authors.lastname: Xia