Статья

High-performance transition metal–doped Pt <sub>3</sub> Ni octahedra for oxygen reduction reaction

Xiaoqing HuangCalifornia NanoSystems Institute (CNSI), University of California, Los Angeles, CA 90095, USAZipeng ZhaoCalifornia NanoSystems Institute (CNSI), University of California, Los Angeles, CA 90095, USALiang CaoDepartment of Physics and Astronomy, Johns Hopkins University, Baltimore, MD 21218, USAYu ChenCalifornia NanoSystems Institute (CNSI), University of California, Los Angeles, CA 90095, USAEnbo ZhuCalifornia NanoSystems Institute (CNSI), University of California, Los Angeles, CA 90095, USAZhaoyang LinDepartment of Chemistry and Biochemistry, University of California, Los Angeles, CA 90095, USAMufan LiDepartment of Chemistry and Biochemistry, University of California, Los Angeles, CA 90095, USAAiming YanDepartment of Physics and Center of Integrated Nanomechanical Systems, University of California, Berkeley, CA 94720, USAAlex ZettlDepartment of Physics and Center of Integrated Nanomechanical Systems, University of California, Berkeley, CA 94720, USAYinmin WangPhysical and Life Sciences Directorate, Lawrence Livermore National Laboratory (LLNL), Livermore, CA 94550, USAXiangfeng DuanCalifornia NanoSystems Institute (CNSI), University of California, Los Angeles, CA 90095, USATim MuellerDepartment of Materials Science and Engineering, Johns Hopkins University, Baltimore, MD 21218, USAYu HuangCalifornia NanoSystems Institute (CNSI), University of California, Los Angeles, CA 90095, USA

2015en

ABI

Аннотация

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.

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Идентификаторы

DOI: 10.1126/science.aaa8765

Цитирования и источники

Цитирований: 2Использованных источников: 0

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