title: ELECTROCHEMISTRY. High-performance transition metal-doped Pt₃Ni octahedra for oxygen reduction reaction.
abstract: Bimetallic platinum-nickel (Pt-Ni) nanostructures represent an emerging class of electrocatalysts for oxygen reduction reaction (ORR) in fuel cells, but practical applications have been limited by catalytic activity and durability. We surface-doped Pt3Ni octahedra supported on carbon with transition metals, termed M-Pt3Ni/C, where M is vanadium, chromium, manganese, iron, cobalt, molybdenum (Mo), tungsten, or rhenium. The Mo-Pt3Ni/C showed the best ORR performance, with a specific activity of 10.3 mA/cm(2) and mass activity of 6.98 A/mg(Pt), which are 81- and 73-fold enhancements compared with the commercial Pt/C catalyst (0.127 mA/cm(2) and 0.096 A/mg(Pt)). Theoretical calculations suggest that Mo prefers subsurface positions near the particle edges in vacuum and surface vertex/edge sites in oxidizing conditions, where it enhances both the performance and the stability of the Pt3Ni catalyst.
authors.affiliation: Department of Materials Science and Engineering, University of California, Los Angeles, CA 90095, USA. California NanoSystems Institute (CNSI), University of California, Los Angeles, CA 90095, USA.
authors.forename: Xiaoqing
authors.initials: X
authors.lastname: Huang
authors.affiliation: Department of Materials Science and Engineering, University of California, Los Angeles, CA 90095, USA. California NanoSystems Institute (CNSI), University of California, Los Angeles, CA 90095, USA.
authors.forename: Zipeng
authors.initials: Z
authors.lastname: Zhao
authors.affiliation: Department of Physics and Astronomy, Johns Hopkins University, Baltimore, MD 21218, USA.
authors.forename: Liang
authors.initials: L
authors.lastname: Cao
authors.affiliation: Department of Materials Science and Engineering, University of California, Los Angeles, CA 90095, USA. California NanoSystems Institute (CNSI), University of California, Los Angeles, CA 90095, USA.
authors.forename: Yu
authors.initials: Y
authors.lastname: Chen
authors.affiliation: Department of Materials Science and Engineering, University of California, Los Angeles, CA 90095, USA. California NanoSystems Institute (CNSI), University of California, Los Angeles, CA 90095, USA.
authors.forename: Enbo
authors.initials: E
authors.lastname: Zhu
authors.affiliation: Department of Chemistry and Biochemistry, University of California, Los Angeles, CA 90095, USA.
authors.forename: Zhaoyang
authors.initials: Z
authors.lastname: Lin
authors.affiliation: Department of Chemistry and Biochemistry, University of California, Los Angeles, CA 90095, USA.
authors.forename: Mufan
authors.initials: M
authors.lastname: Li
authors.affiliation: Department of Physics and Center of Integrated Nanomechanical Systems, University of California, Berkeley, CA 94720, USA. Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA. Kavli Energy NanoSciences Institute at the University of California, Berkeley, and the Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA.
authors.forename: Aiming
authors.initials: A
authors.lastname: Yan
authors.affiliation: Department of Physics and Center of Integrated Nanomechanical Systems, University of California, Berkeley, CA 94720, USA. Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA. Kavli Energy NanoSciences Institute at the University of California, Berkeley, and the Lawrence Berkeley National Laboratory, Berkeley, CA 94720, USA.
authors.forename: Alex
authors.initials: A
authors.lastname: Zettl
authors.affiliation: Physical and Life Sciences Directorate, Lawrence Livermore National Laboratory (LLNL), Livermore, CA 94550, USA.
authors.forename: Y Morris
authors.initials: YM
authors.lastname: Wang
authors.affiliation: California NanoSystems Institute (CNSI), University of California, Los Angeles, CA 90095, USA. Department of Chemistry and Biochemistry, University of California, Los Angeles, CA 90095, USA.
authors.forename: Xiangfeng
authors.initials: X
authors.lastname: Duan
authors.affiliation: Department of Materials Science and Engineering, Johns Hopkins University, Baltimore, MD 21218, USA. tmueller@jhu.edu yhuang@seas.ucla.edu.
authors.forename: Tim
authors.initials: T
authors.lastname: Mueller
authors.affiliation: Department of Materials Science and Engineering, University of California, Los Angeles, CA 90095, USA. California NanoSystems Institute (CNSI), University of California, Los Angeles, CA 90095, USA. tmueller@jhu.edu yhuang@seas.ucla.edu.
authors.forename: Yu
authors.initials: Y
authors.lastname: Huang