Understanding the mechanism of synthesis of Pt3Co intermetallic nanoparticles via preferential chemical vapor deposition,Journal of Materials Chemistry A

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Understanding the mechanism of synthesis of Pt3Co intermetallic nanoparticles via preferential chemical vapor deposition
Journal of Materials Chemistry A ( IF 10.7 ) Pub Date : 2017-10-14 00:00:00 , DOI: 10.1039/c7ta06737b
S. Saedy _{1,

2,

3,

4,

5} , D. Palagin _{6,

7,

8,

9} , O. Safonova _{7,

9} , J. A. van Bokhoven _{6,

7,

8,

9,

10} , A. A. Khodadadi _{1,

2,

3,

4,

5} , Y. Mortazavi _{1,

2,

3,

4,

5}

Affiliation

A detailed study on the synthesis of Pt₃Co intermetallic nanoparticles supported on ceria via preferential chemical vapor deposition was conducted, leading to a fundamental understanding of the deposition process and the Co–Pt alloying. This understanding helps us to develop a facile and scalable method for preferential adding of a metal on the surface of another metal already supported on an oxide which facilitates the design of novel structured nanoparticles. The fluidized flow reactor eliminated the deposition profile and resulted in Pt₃Co nanoparticles uniformly and homogeneously distributed on ceria. The kinetic study of cobalt deposition on the platinum surface, in accordance with DFT calculations, demonstrates that the platinum surface catalyzes the deposition reaction; while the ceria surface is inert in the preferential deposition temperature window between 150 °C and 180 °C. The obtained sample was characterized by in situ XRD, HAADF-STEM, FT-IR, and XAS methods. The results indicate the formation of uniform Pt₃Co nanoparticles with an average size of 1.1 nm. This sample showed superior catalytic activity in preferential oxidation of CO with an almost twice higher CO conversion rate and CO₂ selectivity compared to a classically synthesized sample with successive impregnation.

中文翻译：

了解通过优先化学气相沉积合成Pt ₃ Co金属间纳米颗粒的机理

进行了通过优先化学气相沉积法在二氧化铈上负载的Pt ₃ Co金属间纳米颗粒的合成的详细研究，从而使人们对沉积过程和Co-Pt合金化有了基本的了解。这种理解有助于我们开发一种简便且可扩展的方法，用于优先在已经负载在氧化物上的另一种金属的表面上优先添加金属，这有助于新型结构化纳米颗粒的设计。流化流反应器消除了沉积曲线并生成了Pt ₃Co纳米颗粒均匀且均匀地分布在二氧化铈上。根据DFT计算，对钴在铂表面上沉积的动力学研究表明，铂表面催化了沉积反应。而二氧化铈表面在150°C至180°C的优先沉积温度范围内是惰性的。通过原位XRD，HAADF-STEM，FT-IR和XAS方法对获得的样品进行表征。结果表明形成平均尺寸为1.1nm的均匀的Pt ₃ Co纳米颗粒。与连续浸渍的经典合成样品相比，该样品在优先氧化CO方面表现出优异的催化活性，其CO转化率和CO ₂选择性几乎高出两倍。

更新日期：2017-11-16

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