Ru–Pt core–shell nanoparticles for preferential oxidation of carbon monoxide in hydrogen

Alayoǧlu, Selim; Nilekar, Anand Udaykumar; Mavrikakis, Manos; Eichhorn, Bryan W.

doi:10.1038/nmat2156

Cited by 1,201 publications

(1,051 citation statements)

References 49 publications

Supporting

Mentioning

997

Contrasting

Unclassified

Order By: Relevance

“…An expansion of the Pt-Pt interatomic distances demonstrated an enhanced catalytic activity on oxide reduction, as well as a significantly improved resistance to CO poisoning [48]. Similar beneficial effects were also reported for Pd particles [49].…”

Section: Structural Characterizationsupporting

confidence: 64%

Optimized reduction conditions for the microfluidic synthesis of 1.3 ± 0.3 nm Pt clusters

et al. 2015

View full text Add to dashboard Cite

Recently, small (\2 nm) and monodispersed Pt clusters has gained much attention due to their high catalytic activity in the aerobic oxidations. However, the chemical synthesis of small Pt clusters is not trivial; high temperature is often required to completely reduce the Pt 4?/2? ions to Pt 0 , which accelerates the growth of the Pt clusters. Here, we discussed a very simple microfluidic reduction of Pt 4? to Pt 0 by NaBH 4 in the presence of PVP that produces \2 nm Pt clusters in any variable reduction conditions. The microfluidic reduction conditions were optimized for the synthesis of possible smallest Pt clusters in terms of five reaction parameters: (1) temperature, (2) concentration of H 2 PtCl 6 , (3) molar ratio of NaBH 4 to Pt 4? ions, (4) molar ratio of PVP-monomer to Pt 4? ions, and (5) molecular weight/chain length of PVP. We found that possible smallest particles with average diameter 1.3 ± 0.3 nm were produced when aqueous solutions of H 2 PtCl 6 (4 mM) and NaBH 4 (40 mM) containing PVP (160 mM) were injected into the micromixer placed in an icebath at a flow rate of 200 mL/h. The produced particles were characterized by UV-visible absorption spectrophotometry, powder X-ray diffractometry and transmission electron microscopy.

show abstract

Section: Structural Characterizationsupporting

confidence: 64%

Optimized reduction conditions for the microfluidic synthesis of 1.3 ± 0.3 nm Pt clusters

et al. 2015

View full text Add to dashboard Cite

show abstract

“…51,74 On the other hand, adsorption of CO, H, O, and O 2 on Pt-skin surfaces is weakened by the subsurface TMs, 9,10,32,[51][52][53]60 but the destabilization occurs with a similar magnitude. 44,51 For example, binding energies of CO and O 2 on a Pt-skin with subsurface Ru are -1.25 and -0.26 eV, respectively, compared to -1.82 eV/CO and -0.65 eV/O 2 on Pt(111). 44 On the basis of these arguments, the Pt-skin surfaces are still poisoned by CO, and the CO oxidation is limited by O 2 activation in the low-temperature regime.…”

Section: ' Introductionmentioning

confidence: 99%

Synergetic Effect of Surface and Subsurface Ni Species at Pt−Ni Bimetallic Catalysts for CO Oxidation

et al. 2011

J. Am. Chem. Soc.

269

193

View full text Add to dashboard Cite

Various well-defined Ni-Pt(111) model catalysts are constructed at atomiclevel precision under ultra-high-vacuum conditions and characterized by X-ray photoelectron spectroscopy and scanning tunneling microscopy. Subsequent studies of CO oxidation over the surfaces show that a sandwich surface (NiO 1-x /Pt/Ni/Pt(111)) consisting of both surface Ni oxide nanoislands and subsurface Ni atoms at a Pt(111) surface presents the highest reactivity. A similar sandwich structure has been obtained in supported Pt-Ni nanoparticles via activation in H 2 at an intermediate temperature and established by techniques including acid leaching, inductively coupled plasma, and X-ray adsorption nearedge structure. Among the supported Pt-Ni catalysts studied, the sandwich bimetallic catalysts demonstrate the highest activity to CO oxidation, where 100% CO conversion occurs near room temperature. Both surface science studies of model catalysts and catalytic reaction experiments on supported catalysts illustrate the synergetic effect of the surface and subsurface Ni species on the CO oxidation, in which the surface Ni oxide nanoislands activate O 2 , producing atomic O species, while the subsurface Ni atoms further enhance the elementary reaction of CO oxidation with O.

show abstract

“…[1][2][3][4][5][6][7][8] Interest in these nanoparticles has been based largely on their vivid optical properties, which are due to their collective electronic resonances, known as surface plasmons. Exquisite size and shape control has been achieved in the synthesis of noble metal nanoparticles such as gold, silver, and platinum, but the intrinsic properties and high cost of these noble metals present significant limitations for large-scale use.…”

mentioning

confidence: 99%

Aluminum Nanocrystals

McClain¹,

Schlather²,

Ringe³

et al. 2015

Nano Lett.

185

241

View full text Add to dashboard Cite

Abstract:We demonstrate the facile synthesis of high purity aluminum nanocrystals over a range of controlled sizes from 70 nm to 220 nm diameter, with size control achieved through a simple modification of solvent ratios in the reaction solution. The monodisperse, icosahedral and trigonal bipyramidal nanocrystals are air-stable for weeks, due to the formation of a 2-4 nm thick passivating oxide layer on their surfaces. We show that the nanocrystals support sizedependent ultraviolet and visible plasmon modes, providing a far more sustainable alternative to gold and silver nanoparticles currently in widespread use.

show abstract

Ru–Pt core–shell nanoparticles for preferential oxidation of carbon monoxide in hydrogen

Cited by 1,201 publications

References 49 publications

Optimized reduction conditions for the microfluidic synthesis of 1.3 ± 0.3 nm Pt clusters

Optimized reduction conditions for the microfluidic synthesis of 1.3 ± 0.3 nm Pt clusters

Synergetic Effect of Surface and Subsurface Ni Species at Pt−Ni Bimetallic Catalysts for CO Oxidation

Aluminum Nanocrystals

Contact Info

Product

Resources

About