Oleylamine‐Mediated Shape Evolution of Palladium Nanocrystals

Niu, Zhiqiang; Peng, Qing; Gong, Mali; Rong, Hongpan; Li, Yadong

doi:10.1002/anie.201100512

Cited by 158 publications

(137 citation statements)

References 49 publications

(34 reference statements)

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“…Very recently, Li et al succeeded in preparing various Pd nanostructures fully enclosed by {111} (i.e., icosahedron, decahedron, octahedron, tetrahedron, and triangular plate) by using formaldehyde as reducing agent in the presence of oleylamine. [109] The combined use of Na 2 C 2 O 4 and formaldehyde led to the formation of PtPd tetrahedral nanocrystals. [70] To fully understand the formation mechanism of concave Pd polyhedra, further studies are still needed to address the question why the concave feature could be created in the presence of formaldehyde.…”

Section: Concave Pd Polyhedra With Controllable Concavitymentioning

confidence: 99%

Small Adsorbate‐Assisted Shape Control of Pd and Pt Nanocrystals

et al. 2012

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The shape control of noble metal nanocrystals is crucial to their optical properties and catalysis applications. In this Progress Report, the recent progress of shape-controlled synthesis of Pd and Pt nanostructures assisted by small adsorbates is summarized. The use of small strong adsorbates (e.g., I(-) , CO, amines) makes it possible to fabricate Pd and Pt nanostructures with not only well-defined surface structure but also morphologies that have not been achieved by other synthetic strategies. The roles of small adsorbates in shape control of Pd and Pt nanocrystals are discussed in the Report. Also presented in the Report are unique optical and catalytic properties of several Pd and Pt nanostructures (e.g., ultrathin Pd nanosheets, concave Pt octapod, concave Pd tetrahedra), as well as their bioapplications, to demonstrate the power of using small strong adsorbates in the shape control of Pt and Pd nanostructures.

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Section: Concave Pd Polyhedra With Controllable Concavitymentioning

confidence: 99%

Small Adsorbate‐Assisted Shape Control of Pd and Pt Nanocrystals

et al. 2012

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“…The addition of the second/third metal not only changes the surface active sites by ensemble effect, but also alters the binding strength of reactants, intermediates, and products by electronic/strain effect [26][27][28]. Different noble metals polyhedrons/ concave expose atoms with different coordination numbers, thus have different surface energy and exhibit different catalytic performances [29][30][31]. 1D (wire) and 2D (plate, belt/ ribbon) noble metal-based nanostructures have high surface area (high atom utilization efficiency), high conductivity and large interfacial area contacting with the support in electrochemical reactions [12,15,32].…”

Section: à2mentioning

confidence: 99%

“…A nanosegregated noble metal skin on these open structures can further improve the catalytic performance [18,37]. Thus, numerous shape-controlled synthetic strategies are established in colloidal reaction system, such as facet-selective capping (CO [38,39], halide anions [40], amines [9], formaldehyde [30,41], etc. ), seed growth [42,43] and oxidative etching [44].…”

Section: à2mentioning

confidence: 99%

“…Compared with hydrophilic solvents such as water, ethylene glycol and DMF, systematic shape control of Pd NCs in hydrophobic solvent remains a challenging task. As shown in Figure 4, Niu et al synthesized icosahedral, decahedral, octahedral, tetrahedral and triangular plates Pd NCs in the mixture of OAm, formaldehyde and toluene [30]. In this protocol, Pd(acac) 2 was used as the metal precursor and the morphology of Pd was determined by the quantity of OAm.…”

Section: Pd-based Nanocompositesmentioning

confidence: 99%

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Noble Metal-Based Nanocomposites for Fuel Cells

Rong¹,

Zhang²,

Muhammad³

et al. 2018

Novel Nanomaterials - Synthesis and Applications

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Noble metal-based nanocomposites are attractive for a rich variety of electrocatalytic applications as they can exhibit not only a combination of the properties associated with each component but also synergy due to a strong coupling between different constituents. Using noble metal as the base component, a plenty of methods have been recently demonstrated for the synthesis of noble metal-based nanocomposites with novel structures (e.g., alloys, core-shell, skin and 1D/2D structures). In this chapter, an account of recent advances of synthetic approaches to noble metal-based nanocomposites with controlled structures, compositions and sizes are reviewed. The relationship between structures and electrochemical properties of these nanocomposites in fuel cell field is discussed. The potential future directions of research in the field are also addressed.

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“…Noble metal nanostructures have received continuous attention due to their unique physicochemical properties for numerous catalytic applications [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15]. However, noble metals are extremely rare in nature, resulting in their high price level.…”

Section: Introductionmentioning

confidence: 99%

In situ redox strategy for large-scale fabrication of surfactant-free M-Fe2O3 (M = Pt, Pd, Au) hybrid nanospheres

Feng

Liu

2016

Sci. China Mater.

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effects the catalytic activities, stabilities and selectivity of noble metals can be further optimized [31][32][33]. Among the substrates, magnetic oxides are more attractive on accounts of their excellent magnetic response [34][35][36][37][38][39][40]. Once noble metals are loaded on the magnetic oxide substrates to form stable hybrids, the fast separation of catalyts can be easily achieved from the reaction systems, which will favor simplifing the post-treatment to improve the recyclability.In previous reports, four main kinds of iron oxides supported noble metal nanostructures have been successfully fabricated. One is the simple Fe 3 O 4 /noble met al hybrids, in which noble metal components were evenly dispersed in the Fe 3 O 4 structures [41,42]. The second is the Janus nanostructure. The representive research were done by Sun's group that they realized the synthesis of colloidal dumbbell-like noble metal-Fe 3 O 4 hybrids in an oil phase via the classic seeding growth method [34][35][36][37][38]. The third is in a more complex core@shell nanostructure. Yin et al. [39] presented a water-phase strategy to prepare Fe 3 O 4 @SiO 2 @ Au@SiO 2 multi-layered core@shell nanostructure. For the last, noble metal salts and organometallic precursors were reduced at the same time to form noble metal/Fe alloys, and further oxidizing process resulted in the iron oxides coated noble metals nanostructures. Such obtained four kinds of hybrids are of high quaility, however the oil-phase synthesis makes the post-treatment a little onerous, and some indispensable expensive ligands increase the overall cost [43,44].Ideally, a promising method should be green and suitable for mass production of noble metal catalysts under mild conditions. Moreover, it should decrease and even deny the usage of toxic organic solvents and surfactants. Compared ABSTRACT A facile in situ redox strategy has been developed to fabricate surfactant-free M-Fe2O3 (M = Pt, Pd, Au) hybrid nanospheres. In this process, noble metal salts were directly reduced by the pre-prepared Fe3O4 components in an alkaline aqueous solution without using organic reductants and surfactants. During the redox reaction, Fe3O4 was oxidized into Fe2O3, and the reduzates of noble metal nanoparticles were deposited on the surface of the Fe2O3 nanospheres. Then the characterizations were discussed in detail to study the formation of M-Fe2O3 hybrids. At last, catalytic CO oxidation was selected as a model reaction to evaluate the catalytic performance of these samples. It demonstrates that Pt-Fe2O3 nanospheres can catalyze 100 % conversion of CO into CO2 at 90°C, indicating superior activity relative to Pd-Fe2O3 and Au-Fe2O3.

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Oleylamine‐Mediated Shape Evolution of Palladium Nanocrystals

Cited by 158 publications

References 49 publications

Small Adsorbate‐Assisted Shape Control of Pd and Pt Nanocrystals

Small Adsorbate‐Assisted Shape Control of Pd and Pt Nanocrystals

Noble Metal-Based Nanocomposites for Fuel Cells

In situ redox strategy for large-scale fabrication of surfactant-free M-Fe2O3 (M = Pt, Pd, Au) hybrid nanospheres

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