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段骁,黄龙,栗云彦,唐玲,卢军,赵云昆,刘锋.Pt: Ni 原子比对Pt-Ni八面体氧还原活性的影响研究[J].稀有金属材料与工程(英文),2020,49(2):435~440.[Duan Xiao,Huang Long,Li Yunyan,Tang Ling,Lu Jun,Zhao Yunkun and Liu Feng.Influence of the Pt:Ni atomic ratio on the oxygen reduction reaction activities of Pt-Ni octahedral nanoparticles[J].Rare Metal Materials and Engineering,2020,49(2):435~440.]
Influence of the Pt:Ni atomic ratio on the oxygen reduction reaction activities of Pt-Ni octahedral nanoparticles
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Received:June 21, 2018  Revised:August 30, 2018
DOI:
Key words: Oxygen reduction reaction  Pt-Ni octahedron  Atomic ratio  Surface Lattice contraction  Pt utilization
Foundation item:国家重点研发计划(2016YFB0101309);昆明市科技计划项目(2015-1-G-01001)
Author NameAffiliation
Duan Xiao,Huang Long,Li Yunyan,Tang Ling,Lu Jun,Zhao Yunkun and Liu Feng  
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Abstract:
      Octahedral Pt-Ni nanoparticles surrounded by (111) facet are considered as promising oxygen reduction reaction (ORR) catalysts. It has been reported that the ORR activities of Pt-Ni octahedral nanoparticles are greatly influenced by the Pt:Ni atomic ratio. The relationship between the Pt:Ni atomic ratio of Pt-Ni octahedron and the corresponding ORR activity is presented as a volcano plot without explanation. Herein, by synthesizing Pt-Ni octahedral nanoparticles with composition of Pt3Ni, PtNi and PtNi2, we found an abnormal ORR specific activities in the order of Pt3Ni> PtNi2> PtNi. Meanwhile, with the same Pt loading, the sequence of ORR mass activity is Pt3Ni≈ PtNi2> PtNi. The surface lattice contraction and the utilization of Pt were considered to explain these phenomenon. The extent of surface lattice contraction is decreased as Pt3Ni> PtNi2> PtNi, consistent with the sequence of ORR specific activity, which challenges the previous experience that the more Ni was incorporated into the Pt lattice, the higher the surface lattice contraction yielded. While the mass activity is a balance between specific activity and surface Pt utilization. The results indicated that the ORR activity can be adjusted by tuning the surface tension and surface Pt utilization.