Ligand-free Gold Nanoparticles as a Reference Material for Kinetic Modelling of Catalytic Reduction of 4-Nitrophenol

Gu, Sasa; Kaiser, Julian; Marzun, Galina; Ott, Andreas; Lü, Yan; Ballauff, Matthias; Zaccone, Alessio; Barcikowski, Stephan; Wagener, Philipp

doi:10.1007/s10562-015-1514-7

Cited by 85 publications

(78 citation statements)

References 48 publications

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“…From the linear fit we obtain k 1 = 0.080 s -1 ·m -2 ·L, which is 10 times larger than that of CTAB-stabilized Au NPs (k 1 = 0.008 s -1 ·m -2 ·L) with similar size (d = 10.9 nm) that has been reported for the same reaction. 51 52 HS-PEG2000 13.5 3×10 -3 Lu 53 TWEEN-GO 10.7 3.4×10 -4 Zhang 54 TA-GO 20 1.1×10 -2 Gu 55 Ligand-free 11.1 0.17 a k 1 : apparent rate constant normalized to the surface of the particles in the system.…”

Section: -Nitrophenolate Ions At 400 Nm Is Monitored As the Functionmentioning

confidence: 99%

“…In general, the G-PDA-Au-1 composite particles show quite high catalytic activity, which is comparable with the ligand free Au NPs with similar size. 55 Comparing with ligand-stabilized Au NPs, such as CTAB-Au, 51 and HS-PEG200-Au, 52 the G-PDA-Au-1 nanocatalysts show much higher catalytic activity. Moreover, comparing to graphene oxide (GO)-supported Au NPs, such as Au NPs deposited on tannic acid (TA)-functionalized graphene oxide (GO) 54 or AuNPs/TWEEN/GO, 53 the present catalyst system also shows better results.…”

Section: -Nitrophenolate Ions At 400 Nm Is Monitored As the Functionmentioning

confidence: 99%

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In Situ Synthesis of Catalytic Active Au Nanoparticles onto Gibbsite–Polydopamine Core–Shell Nanoplates

Cao

Mei

et al. 2015

Langmuir

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We report a facile method to synthesize anisotropic platelike gibbsite-polymer core-shell particles. Dopamine is self-polymerized on the surface of gibbsite nanoplates and forms a homogeneous layer on it. Transmission electron microscopy characterization of the resulting latexes demonstrates the formation of well-defined platelike core-shell particles. Reaction time and ultrasonification are found to be important factors to control the thickness of the polymer shell and avoid aggregation. Good control over the platelike morphology and 100% encapsulation efficiency have been achieved via this novel route. The resulting well-defined gibbsite-polydamine (G-PDA) core-shell nanoplates show excellent colloidal stability and can form opal-like columnar crystal with iridescent Bragg reflection after modest centrifugation. In addition, G-PDA core-shell nanoplates can serve both as reductant and stabilizer for the generation of Au nanoparticles (NPs) in situ. Au NPs with tunable size have been formed on the G-PDA particle surface, which show efficient catalytic activity for the reduction of 4-nitrophenol and Rhodamine B (RhB) in the presence of borohydride. Such nanocatalysts can be easily deposited on silicon substrate by spin-coating due to the large contact area of platelike G-PDA particles and the strong adhesive behavior of the PDA layer. The substrate-deposited nanocatalyst can be easily recycled which show excellent reusability for the reduction of RhB.

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Section: -Nitrophenolate Ions At 400 Nm Is Monitored As the Functionmentioning

confidence: 99%

Section: -Nitrophenolate Ions At 400 Nm Is Monitored As the Functionmentioning

confidence: 99%

In Situ Synthesis of Catalytic Active Au Nanoparticles onto Gibbsite–Polydopamine Core–Shell Nanoplates

Cao

Mei

et al. 2015

Langmuir

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“…Ligand‐free LAL‐synthesized alloy particles have several advantages over chemical synthesis methods. They are good candidates as reference materials for instance for kinetic modeling of catalytic reactions . LAL‐synthesized NPs also have a higher catalytic activity as electrocatalysts for biofuel cells, or photocatalysts for water splitting when compared to chemically synthesized counterparts.…”

Section: Introductionmentioning

confidence: 99%

Formation Mechanism of Laser-Synthesized Iron-Manganese Alloy Nanoparticles, Manganese Oxide Nanosheets and Nanofibers

Zhang

Spasova

et al. 2017

Part. Part. Syst. Charact.

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Laser ablation in liquids (LAL) has emerged as a versatile approach for the synthesis of alloy particles and oxide nanomaterials. However, complex chemical reactions often take place during synthesis due to inevitable atomization and ionization of the target materials and decomposition/hydrolysis of solvent/solution molecules, making it difficult to understand the particle formation mechanisms. In this paper, a possible route for the formation of FeMn alloy nanoparticles as well as MnOx nanoparticles, ‐sheets, and ‐fibers by LAL is presented. The observed structural, compositional, and morphological variations are clarified by transmission electron microscopy (TEM). The studies suggest that a reaction between Mn atoms and Fe ions followed by surface oxidation result in nonstoichiometric synthesis of Fe‐rich FeMn@FeMn2O4 core–shell alloy particles. Interestingly, a phase transformation from Mn3O4 to Mn2O3 and finally to Ramsdellite γ‐MnO2 is accompanied by a morphology change from nanosheets to nanofibers in gradually increasing oxidizing environments. High‐resolution TEM images reveal that the particle‐attachment mechanism dominates the growth of different manganese oxides.

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“…[19][20][21][22] X-ray photoelectron analysis ( Figure S1.3) shows that the surface of Au-Fe nanoalloys obtained from LASiS is composed only of metal Au and oxidized Fe,constituting apassivation layer that confers to the nanoalloy excellent stability in air and water environment. [19][20][21][22] X-ray photoelectron analysis ( Figure S1.3) shows that the surface of Au-Fe nanoalloys obtained from LASiS is composed only of metal Au and oxidized Fe,constituting apassivation layer that confers to the nanoalloy excellent stability in air and water environment.…”

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confidence: 99%

Enhanced Electrocatalytic Oxygen Evolution in Au–Fe Nanoalloys

et al. 2017

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Oxygen evolution reaction (OER) is the most critical step in water splitting, still limiting the development of efficient alkaline water electrolyzers. Here we investigate the OER activity of Au-Fe nanoalloys obtained by laser-ablation synthesis in solution. This method allows a high amount of iron (up to 11 at %) to be incorporated into the gold lattice, which is not possible in Au-Fe alloys synthesized by other routes, due to thermodynamic constraints. The Au Fe nanoalloys exhibit strongly enhanced OER in comparison to the individual pure metal nanoparticles, lowering the onset of OER and increasing up to 20 times the current density in alkaline aqueous solutions. Such a remarkable electrocatalytic activity is associated to nanoalloying, as demonstrated by comparative examples with physical mixtures of gold and iron nanoparticles. These results open attractive scenarios to the use of kinetically stable nanoalloys for catalysis and energy conversion.

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Ligand-free Gold Nanoparticles as a Reference Material for Kinetic Modelling of Catalytic Reduction of 4-Nitrophenol

Cited by 85 publications

References 48 publications

In Situ Synthesis of Catalytic Active Au Nanoparticles onto Gibbsite–Polydopamine Core–Shell Nanoplates

In Situ Synthesis of Catalytic Active Au Nanoparticles onto Gibbsite–Polydopamine Core–Shell Nanoplates

Formation Mechanism of Laser-Synthesized Iron-Manganese Alloy Nanoparticles, Manganese Oxide Nanosheets and Nanofibers

Enhanced Electrocatalytic Oxygen Evolution in Au–Fe Nanoalloys

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