Tuning the chemical activity through PtAu nanoalloying: a first principles study

Mokkath, Junais Habeeb; Schwingenschlögl, Udo

doi:10.1039/c3ta11871a

Cited by 19 publications

(14 citation statements)

References 22 publications

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“…43 As for the PtAu system, it has been theoretically predicted as well as experimentally proved that strong dissociative adsorption of hydrogen can take place more efficiently on Pt clusters than on Au clusters (or mixed PtAu sites). [16][17][18][19] In our case, from the synthesis point of view it is reasonable to propose the presence of a small number of clusters, which may be even under the detection limit, on the surface as a result of laser ablation. Clustered atoms have been reported to be present in the plasma plume formed by laser ablation.…”

Section: Fabrication Of Ptau-np/ceo 2 -Nt Hybrid Catalystsmentioning

confidence: 77%

“…Bimetallic nanostructures have recently attracted considerable attention due to their improved catalytic properties as compared to monometallic NPs for several catalytic reactions. [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20] For example, Stamenkovic et al reported the enhancement in the kinetics of the oxygen-reduction reaction (ORR) using PtM (M ¼ Ni, Co, Fe) alloy NP catalysts in fuel cells, and revealed that the surface electronic structure of alloy NPs has an important effect on their electrocatalytic activity. 1,2 Elsewhere, Huang et al reported the enhanced catalytic activity of PtPd alloy nanocrystal catalysts for the hydrogenation of nitrobenzene and showed that the activity depends on the structure and composition of the materials.…”

Section: Introductionmentioning

confidence: 99%

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Highly active PtAu alloy nanoparticle catalysts for the reduction of 4-nitrophenol

et al. 2014

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To enhance the catalytic activity of gold nanoparticles (AuNPs) for the hydrogenation of nitro-aromatic chemicals, Pt was introduced into AuNPs to form "bare" PtAu alloy NPs using a physical approach, pulsed laser ablation in liquid (PLAL), on single metal-mixture targets. These PLAL-NPs are deemed to favor catalysis due to the absence of any surfactant molecules on their unique "bare and clean" surface. The PLAL-NPs were facilely assembled onto CeO2 nanotubes (NTs) by simply mixing them without conducting any surface functionalization, representing another advantage of these NPs. Their catalytic activity was assessed in 4-nitrophenol (4-NP) hydrogenation. The reaction catalyzed by alloy-NP/CeO2-NT catalysts demonstrates a remarkably higher reaction rate in comparison with that catalyzed by pure Au and Pt NPs, and other similar Au and Pt containing catalysts reported recently. A "volcano-like" catalytic activity dependence of the alloy NPs on their chemical composition suggests a strong synergistic effect between Au and Pt in the 4-NP reduction, far beyond the simple sum of their individual contributions. It leads to the significantly enhanced catalytic activity of Pt30Au70 and Pt50Au50 alloy NPs, outperforming not only each single constituent, but also their physical mixtures and most recently reported AuNP based nanocatalysts. The favorable d-band center shift of Pt after alloying, and co-operative actions between Pt clusters and nearby Au (or mixed PtAu) sites were proposed as possible mechanisms to explain such a strong synergistic effect on catalysis.

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Section: Fabrication Of Ptau-np/ceo 2 -Nt Hybrid Catalystsmentioning

confidence: 77%

Section: Introductionmentioning

confidence: 99%

Highly active PtAu alloy nanoparticle catalysts for the reduction of 4-nitrophenol

et al. 2014

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“…33 The adsorbed BH 4 − on Pt surface can be easily dissociate to activated [H] and then these resulting activated [H] can be facilely migrated to Au owing to their alloy structure, where the reduction reaction is taken place. 34 In the case of inert oxides (SiO 2 or ZrO 2 ), the electronic structure of Pt─Au is not changed by the oxides, thus the reaction process of 4-NP is proposed to be that the Pt NPs adsorb BH 4 − and dissociate it to activated [H]. Then these [H] can be easily transferred to Au surface and reacts with 4-NP.…”

Section: Resultsmentioning

confidence: 99%

“…In the previous theoretical and experimental study on the bimetal Pt─Au nanocatalysts, it is well suggested that 4‐NP prefers to adsorb on Au, while BH 4 − is more likely to adsorb on Pt . The adsorbed BH 4 − on Pt surface can be easily dissociate to activated [H] and then these resulting activated [H] can be facilely migrated to Au owing to their alloy structure, where the reduction reaction is taken place . In the case of inert oxides (SiO 2 or ZrO 2 ), the electronic structure of Pt─Au is not changed by the oxides, thus the reaction process of 4‐NP is proposed to be that the Pt NPs adsorb BH 4 − and dissociate it to activated [H].…”

Section: Resultsmentioning

confidence: 99%

In Situ Formation of Pt–Au Nanoparticles on Magnetic Composites Carriers: Tuning Catalytic Activity by Incorporation of Different Metal Oxides

Zhang

et al. 2017

Bulletin Korean Chem Soc

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Supported Pt─Au bimetal nanocatalysts have been prepared by an in situ reduction method followed by calcination in air and reduction in H 2 atmosphere. The catalysts exhibit a typical yolk-shell construction composed of a moveable magnetic Fe core and metal oxides shells decorated with Pt─Au nanoparticles. The structure of the bimetal nanocatalysts was characterized in detail by TEM, XRD, XPS, and N 2 physical adsorption and the catalytic activity of the nanocatalysts was studied by the catalytic reduction of 4-nitrophenol to 4-nitrophenol. It is found that the bimetal nanocatalysts composed with the different metallic oxides (TiO 2 and ZrO 2 ) exhibited the comparable Pt─Au particles size (~10 nm). However, the content of Pt─Au nanoparticles was varied with the metallic oxides support. Pt─Au nanoparticles deposited uniformly on TiO 2 with higher loadings, however the nanoparticles on ZrO 2 exhibited remarkably lower content, which should be attributed to the abundant hydroxyl on TiO 2 surface that served as the deposition site for Pt─Au nanoparticles. The result of the reduction reaction indicated that incorporation of TiO 2 in the bimetal Pt─Au nanocatalyst could significantly improve the catalytic activity as compared with ZrO 2 and m-SiO 2 . A possible mechanism was proposed to explain the synergistic effect in the supported Pt─Au bimetal nanocatalysts.

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“…Recently, tremendous attention has been paid to bimetallic nanostructures for several catalytic reactions due to their improved catalytic properties compared to monometallic NPs [18][19][20][21][22]. The surface electronic structure of hybrid NPs has an important effect on their electrocatalytic activity and has enhanced the kinetics of the oxygen-reduction reaction (ORR) in experiments using Pt-M (M¼Ni, Co, Fe)-hybrid NP catalysts in fuel cells [23,24].…”

Section: Introductionmentioning

confidence: 99%

In-situ green synthesis of highly active GSH-capped Pt-Au-Ag-hybrid nanoclusters

et al. 2014

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Recently much attention has been paid to the application of metal hybrid nanoparticles in industrial catalytic fields because of their super-efficient catalytic activity and attractive properties. We explored a novel strategy to prepare GSH-capped Pt-Au-Ag-hybrid nanoclusters through the synergistic effect between ascorbic acid (VC) and glutathione (GSH) with chloroplatinic acid, chloroauric acid, and silver nitrate as precursors. The potential utilization of as-prepared GSH-capped Pt-Au-Aghybrid nanoclusters for catalytic applications has been evaluated through the reduction of 4-nitrophenol (4-NP) with NaBH 4 ; we obtained the kinetic data by monitoring with UV-Vis spectroscopy. Our results illustrate that GSH-capped Pt-AuAg-hybrid nanoclusters could facilitate the process of reduction of 4-NP in a way that is unprecedented. This approach may offer a novel, non-cytotoxicity, efficient catalyst for industry.Pt-Au-Ag-hybrid, ascorbic acid, glutathione, 4-nitrophenol, catalyst

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Tuning the chemical activity through PtAu nanoalloying: a first principles study

Cited by 19 publications

References 22 publications

Highly active PtAu alloy nanoparticle catalysts for the reduction of 4-nitrophenol

Highly active PtAu alloy nanoparticle catalysts for the reduction of 4-nitrophenol

In Situ Formation of Pt–Au Nanoparticles on Magnetic Composites Carriers: Tuning Catalytic Activity by Incorporation of Different Metal Oxides

In-situ green synthesis of highly active GSH-capped Pt-Au-Ag-hybrid nanoclusters

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