Icosahedral Platinum Alloy Nanocrystals with Enhanced Electrocatalytic Activities,Journal of the American Chemical Society

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Icosahedral Platinum Alloy Nanocrystals with Enhanced Electrocatalytic Activities
Journal of the American Chemical Society ( IF 14.4 ) Pub Date : 2012-07-06 , DOI: 10.1021/ja303950v
Jianbo Wu _{1,

2} , Liang Qi ₃ , Hongjun You ₁ , Adam Gross ₁ , Ju Li ₃ , Hong Yang _{1,

2}

Affiliation

This communication describes the synthesis of Pt-M (M = Au, Ni, Pd) icosahedral nanocrystals based on the gas reducing agent in liquid solution method. Both CO gas and organic surface capping agents play critical roles in stabilizing the icosahedral shape with {111} surfaces. Among the Pt-M alloy icosahedral nanocrystals generated, Pt(3)Ni had an impressive ORR specific activity of 1.83 mA/cm(2)(Pt) and 0.62 A/mg(Pt). Our results further show that the area-specific activity of icosahedral Pt(3)Ni catalysts was about 50% higher than that of the octahedral Pt(3)Ni catalysts (1.26 mA/cm(2)(Pt)), even though both shapes are bound by {111} facets. Density functional theory calculations and molecular dynamics simulations indicate that this improvement may arise from strain-induced electronic effects.

中文翻译：

具有增强电催化活性的二十面体铂合金纳米晶体

本通讯描述了基于液体溶液中气体还原剂方法合成 Pt-M（M = Au、Ni、Pd）二十面体纳米晶体。CO 气体和有机表面封端剂在稳定具有 {111} 表面的二十面体形状方面起着关键作用。在生成的 Pt-M 合金二十面体纳米晶体中，Pt(3)Ni 具有令人印象深刻的 ORR 比活性，分别为 1.83 mA/cm(2)(Pt) 和 0.62 A/mg(Pt)。我们的结果进一步表明，二十面体 Pt(3)Ni 催化剂的面积比活性比八面体 Pt(3)Ni 催化剂 (1.26 mA/cm(2)(Pt)) 高约 50%，即使两者都是形状受 {111} 面的约束。密度泛函理论计算和分子动力学模拟表明，这种改进可能源于应变诱导的电子效应。

更新日期：2012-07-06

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