title: Ru Nanoframes with an fcc Structure and Enhanced Catalytic Properties.
abstract: Noble-metal nanoframes are of great interest to many applications due to their unique open structures. Among various noble metals, Ru has never been made into nanoframes. In this study, we report for the first time an effective method based on seeded growth and chemical etching for the facile synthesis of Ru nanoframes with high purity. The essence of this approach is to induce the preferential growth of Ru on the corners and edges of Pd truncated octahedra as the seeds by kinetic control. The resultant Pd-Ru core-frame octahedra could be easily converted to Ru octahedral nanoframes of ∼2 nm in thickness by selectively removing the Pd cores through chemical etching. Most importantly, in this approach the face-centered cubic (fcc) crystal structure of Pd seeds was faithfully replicated by Ru that usually takes an hcp structure. The fcc Ru nanoframes showed higher catalytic activities toward the reduction of p-nitrophenol by NaBH4 and the dehydrogenation of ammonia borane compared with hcp Ru nanowires with roughly the same thickness.
authors.affiliation: Department of Chemistry, Michigan Technological University , Houghton, Michigan 49931, United States.
authors.forename: Haihang
authors.initials: H
authors.lastname: Ye
authors.affiliation: Department of Materials Science and Engineering, University of Texas at Dallas , Richardson, Texas 75080, United States.
authors.forename: Qingxiao
authors.initials: Q
authors.lastname: Wang
authors.affiliation: Department of Materials Science and Engineering, University of Texas at Dallas , Richardson, Texas 75080, United States.
authors.forename: Massimo
authors.initials: M
authors.lastname: Catalano
authors.affiliation: Department of Materials Science and Engineering, University of Texas at Dallas , Richardson, Texas 75080, United States.
authors.forename: Ning
authors.initials: N
authors.lastname: Lu
authors.affiliation: Department of Chemistry, Michigan Technological University , Houghton, Michigan 49931, United States.
authors.forename: Joseph
authors.initials: J
authors.lastname: Vermeylen
authors.affiliation: Department of Materials Science and Engineering, University of Texas at Dallas , Richardson, Texas 75080, United States.
authors.forename: Moon J
authors.initials: MJ
authors.lastname: Kim
authors.affiliation: Center for Nanoscale Materials, Argonne National Laboratory , 9700 South Cass Avenue, Argonne, Illinois 60439, United States.
authors.forename: Yuzi
authors.initials: Y
authors.lastname: Liu
authors.affiliation: Department of Chemistry, Temple University , Philadelphia, Pennsylvania 19122, United States.
authors.forename: Yugang
authors.initials: Y
authors.lastname: Sun
authors.affiliation: Department of Chemistry, Michigan Technological University , Houghton, Michigan 49931, United States.
authors.forename: Xiaohu
authors.initials: X
authors.lastname: Xia
keywords: Ruthenium; catalysis; crystal structure; kinetic control; nanoframe