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首页> 外文期刊>Catalysis science & technology >Core@shell nanostructured Au-d@NimPtm for electrochemical oxygen reduction reaction: effect of the core size and shell thickness
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Core@shell nanostructured Au-d@NimPtm for electrochemical oxygen reduction reaction: effect of the core size and shell thickness

机译：电化学氧还原反应:效果核心的大小和壳壁厚度

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We showed earlier that using Au nanoparticles of ca. 3.5 nm for the cores to construct core-shell Au@NimPt2 nanostructures can be promising for developing high performance Pt catalysts for the oxygen reduction reaction (ORR) in acidic electrolytes (L.-L. Shen, G.-R. Zhang, S. Miao, J. Liu and B.-Q. Xu, ACS Catal., 2016, 6, 1680-1690). By varying the nanosize of Au cores (d = 2.2-10.3 nm) and the atomic Pt/Au (or Ni/Au) ratio (m = 0.5-6), serial Au-d@NimPtm nanostructures are herein constructed and characterized comprehensively to investigate effects of the Au-core size and NiPt-shell thickness on the Pt activity for the ORR. Maximization of the Pt intrinsic activity (IA(Pt)) to as high as ca. 1.06 mA cm(Pt)(-2) at 0.9 V (vs. RHE) is observed on Au-d@Ni2Pt2 of d = 7.7 and 10.3 nm, 4-fold higher than that of conventional Pt/C (E-TEK). Construction of Au-2.2@NimPtm samples by variation of m demonstrates that the formation of an integrated NiPt-shell of suitable thickness is essential for improving IA(Pt), whose number appears to correlate with the reduction potential of oxidized surface Pt (or surface Pt-O). The integrated NiPt-shell is also shown to be crucial to the catalytic durability of Pt during the ORR. These observations are discussed in terms of surface faceting, strain and electronic effects in association with the Au cores.
机译：我们之前显示,使用非盟的纳米颗粒3.5 nm为核心构建核壳Au@NimPt2纳米结构可以有前途的发展高性能Pt的催化剂氧还原反应在酸性(ORR)电解质(l l。j·刘,B.-Q。1680 - 1690)。(d = 2.2 - -10.3 nm)和原子Pt /非盟(或Ni / Au)比(m = 0.5 6),连环Au-d@NimPtm纳米结构和本构造而成为全面调查Au-core大小和NiPt-shell的影响厚度在Pt或者活动。最大化的Pt内在活动(IA (Pt))马高达1.06厘米(Pt) (2)0.9 V(和流值)是观察Au-d@Ni2Pt2 d =7.7和10.3 nm,高出4倍传统的Pt / C (E-TEK)。非盟- 2.2 - @nimptm样本变异的m表明一个完整的形成NiPt-shell合适的厚度是至关重要的改善IA (Pt)的数量似乎与减少的潜力氧化表面Pt(或表面Pt-O)。集成NiPt-shell也证明是至关重要的在奥尔Pt的催化耐久性。这些观察结果的讨论表面分类、应变和电子效应与非盟的核心。

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