Morphology, chemical state of nanometric-sized Pt–Cu and Pt–Ag particles, and their photocatalytic activity for mineralization of methanol

Papa, Florica; Miyazaki, Akane; Scurtu, Mariana; Ianculescu, Adelina; Balint, Ioan

doi:10.1007/s11051-014-2249-x

Cited by 6 publications

(3 citation statements)

References 26 publications

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“…Noble metal alloy catalysts have been used for a number of applications [1][2][3][4][5][6][7][8][9][10]. In recent years, Pt-based alloys have been widely used in various fields to reduce the amount of Pt used.…”

Section: Introductionmentioning

confidence: 99%

“…In recent years, Pt-based alloys have been widely used in various fields to reduce the amount of Pt used. Among these alloys, the PtCu alloy is one of the most common alloy catalysts used in heterogeneous catalysis and electrocatalysis [2][3][4][5][6][7][8][9][10]. Adding Cu can improve the catalytic efficiency of Pt, leading to a reduction in the cost and enhancement in the catalytic performance.…”

Section: Introductionmentioning

confidence: 99%

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The effect of the support on the surface composition of PtCu alloy nanocatalysts: In situ XPS and HS-LEIS studies

Huang

Song

et al. 2017

Chinese Journal of Catalysis

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Supported PtCu alloys have been broadly applied in heterogeneous catalysis and electrocatalysis owing to their excellent catalytic performance and high CO tolerance. It is important to analyze the outermost surface composition of the supported alloy nanoparticles to understand the nature of the catalytically active sites. In this paper, homogeneous face-centered cubic PtCu nanoparticles with a narrow particle size distribution were successfully fabricated and dispersed on a high-surface-area TiO2 powder support. The samples were oxidized and reduced in situ and then introduced into the ultrahigh vacuum chamber to measure the topmost surface composition by high-sensitivity low-energy ion scattering spectroscopy, and to determine the oxidation states of the elements by X-ray photoelectron spectroscopy. The surface composition and morphology, elemental distribution, and oxidation states of the components were found to be significantly affected by the support and treatment conditions. The PtCu is de-alloyed upon oxidation with CuO wetting on the TiO2 surface and re-alloyed upon reduction. Phase diagrams of the surface composition and the bulk composition were plotted and compared for the supported and unsupported materials.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

The effect of the support on the surface composition of PtCu alloy nanocatalysts: In situ XPS and HS-LEIS studies

Huang

Song

et al. 2017

Chinese Journal of Catalysis

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“…Some of them have reported the existence of Cu-rich cores and Pt-rich shells 21,31 and some of them have also proposed a reverse order. 26,31,32 Hence, by comparing the mentioned experimental results, one can conclude that stable structures of Pt-Cu nanoparticles mainly depend on their size and chemical environment. 3 In addition to the mentioned experimental investigations, some theoretical studies have been performed for Pt-Cu nanoclusters.…”

Section: Introductionmentioning

confidence: 92%

A molecular dynamics study of the effect of the substrate on the thermodynamic properties of bound Pt–Cu bimetallic nanoclusters

Akbarzadeh

Shamkhali

Abbaspour

et al. 2016

Phys. Chem. Chem. Phys.

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In this work confinement of the Pt708Cu707 bimetallic nanocluster in single-walled carbon, boron nitride, and silicon carbide nanotubes was investigated using molecular dynamics simulation. The results of the calculations showed that at 50% composition, a eutectic-like behavior is seen during the melting-freezing process. Also, the Pt708Cu707 bimetallic nanocluster tends to have a core-shell like structure with a Pt-rich core and a Cu-rich shell, except for boron nitride nanotubes in which the nanocluster exhibits a completely different pattern on the tube wall. The Pt-Cu nanoclusters confined in boron nitride nanotubes are extremely extended on the tube wall in such a way that most of the nanotube-nanocluster interface is covered by a monolayer metal coating which can promise unique physical and chemical properties for these types of nanocomposites. Also, extension of the nanocluster on the substrate surface reduces its melting point.

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Bimetallic alloy Pt/Ag nanoparticles with enhanced catalytic activity for formic acid oxidation

Guo

2014

Appl. Phys. A

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Morphology, chemical state of nanometric-sized Pt–Cu and Pt–Ag particles, and their photocatalytic activity for mineralization of methanol

Cited by 6 publications

References 26 publications

The effect of the support on the surface composition of PtCu alloy nanocatalysts: In situ XPS and HS-LEIS studies

The effect of the support on the surface composition of PtCu alloy nanocatalysts: In situ XPS and HS-LEIS studies

A molecular dynamics study of the effect of the substrate on the thermodynamic properties of bound Pt–Cu bimetallic nanoclusters

Bimetallic alloy Pt/Ag nanoparticles with enhanced catalytic activity for formic acid oxidation

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