Facile synthesis of Au–Pt bimetallic nanocomplexes for direct oxidation of methanol and formic acid

Xie, Ruigang; Chen, Muzi; Wang, Jiaqing; Mei, Sujuan; Pan, Yue; Gu, Hongwei

doi:10.1039/c4ra13285h

Cited by 14 publications

(18 citation statements)

References 25 publications

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“…By using the same two-steps, the seed-growth method, another high-quality 3D bimetallic nanostructure has also been successfully prepared, that is Au-Pt bimetallic nanocomplexes (Figure 5C) [68]. In the synthesis of this bimetallic nanostructure, oleylamine was applied as a reducing agent and hydrogen was used to control the morphology.…”

Section: Bimetallic Pt-m (Au and Pd) Nanocomplexes And Their Electmentioning

confidence: 99%

“…( A ) The synthetic scheme of Au-Pt bimetallic nanocomplexes; ( B ) The TEM image of Au nanoparticles; ( C ) The TEM image of Au-Pt bimetallic nanocomplexes [68]. …”

Section: Bimetallic Pt-m (Au and Pd) Nanocomplexes And Their Electmentioning

confidence: 99%

“…For example, our group reported 3D Pt/Pd bimetallic nanodendrites (Figure 6) using oleylamine as the reducing agent and H 2 for controlling the morphology [69]. Being similar to the synthesis of Au-Pt nanocomplexes [68], H 2 is essential to this synthetic reaction as a capping agent and partially capped hydrogen-active surface, which resulted in the second generation of metallic branches on the tips of active branches. Compared to Pt nanoparticles [70], this Pt/Pd bimetallic nanodendrite showed much better and excellent electrocatalytic activity for the oxidation of methanol.…”

Section: Bimetallic Pt-m (Au and Pd) Nanocomplexes And Their Electmentioning

confidence: 99%

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Novel Metal Nanomaterials and Their Catalytic Applications

Wang

2015

Molecules

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103

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Abstract:In the rapidly developing areas of nanotechnology, nano-scale materials as heterogeneous catalysts in the synthesis of organic molecules have gotten more and more attention. In this review, we will summarize the synthesis of several new types of noble metal nanostructures (FePt@Cu nanowires, Pt@Fe2O3 nanowires and bimetallic Pt@Ir nanocomplexes; Pt-Au heterostructures, Au-Pt bimetallic nanocomplexes and Pt/Pd bimetallic nanodendrites; Au nanowires, CuO@Ag nanowires and a series of Pd nanocatalysts) and their new catalytic applications in our group, to establish heterogeneous catalytic system in "green" environments. Further study shows that these materials have a higher catalytic activity and selectivity than previously reported nanocrystal catalysts in organic reactions, or show a superior electro-catalytic activity for the oxidation of methanol. The whole process might have a great impact to resolve the energy crisis and the environmental crisis that were caused by traditional chemical engineering. Furthermore, we hope that this article will provide a reference point for the noble metal nanomaterials' development that leads to new opportunities in nanocatalysis.

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Section: Bimetallic Pt-m (Au and Pd) Nanocomplexes And Their Electmentioning

confidence: 99%

“…( A ) The synthetic scheme of Au-Pt bimetallic nanocomplexes; ( B ) The TEM image of Au nanoparticles; ( C ) The TEM image of Au-Pt bimetallic nanocomplexes [68]. …”

Section: Bimetallic Pt-m (Au and Pd) Nanocomplexes And Their Electmentioning

confidence: 99%

Section: Bimetallic Pt-m (Au and Pd) Nanocomplexes And Their Electmentioning

confidence: 99%

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Novel Metal Nanomaterials and Their Catalytic Applications

Wang

2015

Molecules

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103

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“…Bimetallic AuPt nanoparticles are commonly formed by co-reduction, 98,108,109 galvanic replacement 86,101 or seed mediated growth. 61,110 In the latter case preformed nanoparticles are introduced to the reaction solution of a coordinated metal precursor, to act as nucleation seeds. Growth occurs at the surface of these seed particles.…”

Section: Experiments 1 | Gold Nanoparticles As Seed Materialsmentioning

confidence: 99%

“…107 Several reports in the literature describe various shapes and properties of bimetallic goldplatinum nanoparticles. 61,101,108 For example, Yoon et al used co-reduction of platinum acetylacetonate and gold(III) chloride in oleylamine to achieve nanocables with a length up to several µm. 108 These nanocables (Figure 10a) consist of gold cores joined together and growing along the 111 zone axis, which then are encapsulated by a thin layer of platinum.…”

Section: Introductionmentioning

confidence: 99%

Shape and Size Control of Bimetallic PtX (X = Au, Ni, Sn) Nanoparticles

Hasenöhrl¹

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<p>Nanoparticles show interesting and novel properties compared to their bulk materials. These properties range from optical, magnetic, electronic to catalytic and can be influenced by shape, size and elemental composition. As the ability to control nanoparticle morphology is important in materials science these particles are actively researched. Moreover, by combining different metals multiple properties intrinsic to those elements can be accessed within a single system. This thesis describes general synthetic approaches and underlying theory in the formation of nanoparticles. Focusing on organic solution phase synthesis, pathways to control both size and shape of nanoparticles are discussed. The concept behind the formation and possible structures of bimetallic nanoparticles are explained. Additionally, a brief overview about used characterisation techniques such as transmission electron microscopy and x-ray diffraction are given. Metallic nanoparticles were formed using the organic solution phase synthesis within Fischer-Porter bottles. Elevated temperatures and the presence of hydrogen lead to thermal decomposition of the metallic precursor, reduction of formed metal ions and subsequent build-up of nanoparticles. For bimetallic nanoparticles the seed mediated growth technique is commonly used. By utilizing this technique bimetallic AuPt nanoparticles were formed. The impact of different surfactants, hydrogen pressure, precursors and reaction time upon the size, elemental composition and morphology of these bimetallic AuPt nanoparticles is investigated. The bimetallic structure is evaluated and experiments to control the growth of platinum onto the seed structures are conducted. Further research deals with the formation of hexagonal close packed (hcp) nickel nanoparticles. By altering the surfactant type and concentration nickel favours to crystallise in its hcp modification rather than its most common face-centred cubic (fcc) phase. It was found that nickel packing in this hcp crystal system is forming hourglass-shaped nanoparticles. These particles are further used in seed mediated growth experiments with a platinum precursor to achieve bimetallic nanoparticles to both exploit the catalytic activity of platinum as well as the magnetic moment of nickel. It is shown that the choice of reaction conditions is crucial to achieve growth onto the nickel surface. Moreover, it was found that these nanoparticles are only selectively coated by platinum on hcp {001} facets leading to exposure of both nickel and platinum surfaces. The key results are summarised and the exploited parameters evaluated. Also, perspectives for future research are discussed and a brief outlook for the application of the investigated bimetallic systems is given. Bimetallic tin-platinum nanoparticles were formed by coreduction of the respective tin and platinum containing metal precursors. Several metal sources for both tin and platinum were investigated upon their decomposition and the resulting nanoparticle shape and elemental composition. The formation of a bimetallic precursor containing a Pt-Sn bond is discussed. Further reaction parameters such as temperature and time are also investigated to eludicate their impact on the formed nanoparticles. Finally, the key results are summarised and the exploited parameters evaluated. Also, perspectives for future research are discussed and a brief outlook for the application of the investigated bimetallic systems is given. The discussion in Chapter 4 about selectively obtaining hcp Ni nanoparticles is shortened and a major focus is given on the platinum coating of these hourglass-shaped nanoparticles, as Lee et al. published a paper on "Shaped Ni nanoparticles with an unconventional hcp crystalline structure" (Chemical Communications, 2014, 50, 6353-6356) during the course of these studies, describing similar methods and findings as observed in this research.</p>

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Stabilizing Diluted Active Sites of Ultrasmall High‐Entropy Intermetallics for Efficient Formic Acid Electrooxidation

Shen,

Xiao,

Deng

et al. 2024

Angewandte Chemie

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The poisoning of undesired intermediates or impurities greatly hinders the catalytic performances of noble metal‐based catalysts. Herein, high‐entropy intermetallics i‐(PtPdIrRu)2FeCu (HEI) are constructed to inhibit the strongly adsorbed carbon monoxide intermediates (CO*) during the formic acid oxidation reaction. As probed by multiple‐scaled structural characterizations, HEI nanoparticles are featured with partially negative Pt oxidation states, diluted Pt/Pd/Ir/Ru atomic sites and ultrasmall average size less than 2 nm. Benefiting from the optimized structures, HEI nanoparticles deliver more than 10 times promotion in intrinsic activity than that of pure Pt, and well‐enhanced mass activity/durability than that of ternary i‐Pt2FeCu intermetallics counterpart. In situ infrared spectroscopy manifests that both bridge and top CO* are favored on pure Pt but limited on HEI. Further theoretical elaboration indicates that HEI displayed a much weaker binding of CO* on Pt sites and sluggish diffusion of CO* among different sites, in contrast to pure Pt that CO* bound more strongly and was easy to diffuse on larger Pt atomic ensembles. This work verifies that HEIs are promising catalysts via integrating the merits of intermetallics and high‐entropy alloys.

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Facile synthesis of Au–Pt bimetallic nanocomplexes for direct oxidation of methanol and formic acid

Abstract: Au–Pt bimetallic nanocomplexes were synthesized and the composition and morphology of the nanocomplexes could be easily controlled by a facile synthesis method.

Cited by 14 publications

References 25 publications

Novel Metal Nanomaterials and Their Catalytic Applications

Novel Metal Nanomaterials and Their Catalytic Applications

Shape and Size Control of Bimetallic PtX (X = Au, Ni, Sn) Nanoparticles

Stabilizing Diluted Active Sites of Ultrasmall High‐Entropy Intermetallics for Efficient Formic Acid Electrooxidation

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