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Pt: Ni 原子比對Pt-Ni八面體氧還原活性的影響研究
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云南省貴金屬新材料控股集團(tuán)有限公司

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國家重點研發(fā)計劃（2016YFB0101309）;昆明市科技計劃項目（2015-1-G-01001）


Influence of the Pt:Ni atomic ratio on the oxygen reduction reaction activities of Pt-Ni octahedral nanoparticles
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Sino-Precious Metals Holding Co,Ltd

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National Key Research and Development Program of China (2016YFB0101309); the Kunming Science and Technology Plan Project (2015-1-G-01001)

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    摘要:

    由(111)面包圍的八面體Pt-Ni納米顆粒被認(rèn)為是有前途的氧還原反應(yīng)(ORR)催化劑。據(jù)報道,Pt Ni八面體納米粒子的ORR活性受Pt∶Ni原子比的影響很大。Pt-Ni八面體的Pt:Ni原子比與相應(yīng)的ORR活性之間的關(guān)系為火山曲線并且缺乏相應(yīng)解釋。本文通過合成Pt3Ni、PtNi和PtNi2三種原子比的Pt-Ni八面體納米粒子,發(fā)現(xiàn)Pt3Ni＞PtNi2> PtNi的ORR面積比活性差異。同時,在相同的Pt負(fù)載下,ORR質(zhì)量比活性的順序為Pt3Ni≈PtNi2> PtNi。表面晶格收縮和Pt的利用率被認(rèn)為是解釋這些現(xiàn)象的原因。表面晶格收縮的程度Pt3Ni＞PtNi2> PtNi,這與ORR面積比活性的順序一致,這挑戰(zhàn)了以前的經(jīng)驗,即Ni越多地結(jié)合到Pt晶格中,表面晶格收縮就越高。而質(zhì)量比活性是面積比活性與表面鉑利用之間的平衡。結(jié)果表明,通過調(diào)節(jié)表面張力和表面鉑的利用可以調(diào)節(jié)ORR活性。

    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 Pt<sub>3</sub>Ni, PtNi and PtNi<sub>2</sub>, we found an abnormal ORR specific activities in the order of Pt<sub>3</sub>Ni> PtNi<sub>2</sub>> PtNi. Meanwhile, with the same Pt loading, the sequence of ORR mass activity is Pt<sub>3</sub>Ni≈ PtNi<sub>2</sub>> 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 Pt<sub>3</sub>Ni> PtNi<sub>2</sub>> 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.

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段驍,黃龍,栗云彥,唐玲,盧軍,趙云昆,劉鋒. Pt: Ni 原子比對Pt-Ni八面體氧還原活性的影響研究[J].稀有金屬材料與工程,2020,49(2):435~440.[Duan Xiao, Huang Long, Li Yunyan, Tang Ling, Lu Jun, Zhao Yunkun, 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.]
DOI：10.12442/j. issn.1002-185X.20180647

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  • 收稿日期:2018-06-21
  • 最后修改日期:2018-08-30
  • 錄用日期:2018-09-13
  • 在線發(fā)布日期: 2020-03-12
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