title: Ultrathin Icosahedral Pt-Enriched Nanocage with Excellent Oxygen Reduction Reaction Activity.
abstract: Cost-efficient utilization of Pt in the oxygen reduction reaction (ORR) is of great importance for the potential industrial scale demand of proton-exchange membrane fuel cells. Designing a hollow structure of a Pt catalyst offers a great opportunity to enhance the electrocatalytic performance and maximize the use of precious Pt. Herein we report a routine to synthesize ultrathin icosahedral Pt-enriched nanocages. In detail, the Pt atoms were conformally deposited on the surface of Pd icosahedral seeds, followed by selective removal of the Pd core by a concentrated HNO3 solution. The icosahedral Pt-enriched nanocage that is a few atomic layers thick includes the merits of abundant twin defects, an ultrahigh surface/volume ratio, and an ORR-favored Pt{111} facet, all of which have been demonstrated to be promoting factors for ORR. With a 10 times higher specific activity and 7 times higher mass activity, this catalyst shows more extraordinary ORR activity than the commercial Pt/C. The ORR activity of icosahedral Pt-enriched nanocages outperforms the cubic and octahedral nanocages reported in the literature, demonstrating the superiority of the icosahedral nanocage structure.
authors.affiliation: Center of Advanced Nanocatalysis, University of Science and Technology of China , Hefei, Anhui 230026, China.
authors.forename: Dong Sheng
authors.initials: DS
authors.lastname: He
authors.affiliation: Center of Advanced Nanocatalysis, University of Science and Technology of China , Hefei, Anhui 230026, China.
authors.forename: Daping
authors.initials: D
authors.lastname: He
authors.affiliation: Center of Advanced Nanocatalysis, University of Science and Technology of China , Hefei, Anhui 230026, China.
authors.forename: Jing
authors.initials: J
authors.lastname: Wang
authors.affiliation: Hefei National Laboratory for Physical Sciences at the Microscale, University of Science and Technology of China , Hefei, Anhui Province 230026, P. R. China.
authors.forename: Yue
authors.initials: Y
authors.lastname: Lin
authors.affiliation: Center of Advanced Nanocatalysis, University of Science and Technology of China , Hefei, Anhui 230026, China.
authors.forename: Peiqun
authors.initials: P
authors.lastname: Yin
authors.affiliation: Center of Advanced Nanocatalysis, University of Science and Technology of China , Hefei, Anhui 230026, China.
authors.forename: Xun
authors.initials: X
authors.lastname: Hong
authors.affiliation: Center of Advanced Nanocatalysis, University of Science and Technology of China , Hefei, Anhui 230026, China.
authors.forename: Yuen
authors.initials: Y
authors.lastname: Wu
authors.affiliation: Center of Advanced Nanocatalysis, University of Science and Technology of China , Hefei, Anhui 230026, China.|Department of Chemistry and Collaborative Innovation Center for Nanomaterial Science and Engineering, Tsinghua University , Beijing 100084, China.
authors.forename: Yadong
authors.initials: Y
authors.lastname: Li