Designer platinum nanoparticles: Control of shape, composition in alloy, nanostructure and electrocatalytic property

Peng, Zhenmeng; Yang, Hong

doi:10.1016/j.nantod.2008.10.010

Cited by 1,004 publications

(885 citation statements)

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“…From both experimental investigations on single crystal surfaces and theoretical studies, it has been widely reported that many physical and chemical properties are strongly dependent on the atomic arrangements and thus the crystallographic plane on the surface [9][10][11][12][13]. Therefore, the shape of the NPs is a crucial parameter in controlling their properties because the shape determines the exposing crystal facets and thus the atomic arrangement and coordination, as well as the fractions of atoms at corners and edges [9][10][11][12][13][14]. Among these noble metal NPs, Pt-based NPs have attracted tremendous attention due to their outstanding catalytic properties in a wide variety of significant applications (e.g., fuel cells, petroleum cracking and hydrogenation) and superior corrosion resistance [1, [11][12][13][14][15][16].…”

Section: Introductionmentioning

confidence: 99%

“…Therefore, the shape of the NPs is a crucial parameter in controlling their properties because the shape determines the exposing crystal facets and thus the atomic arrangement and coordination, as well as the fractions of atoms at corners and edges [9][10][11][12][13][14]. Among these noble metal NPs, Pt-based NPs have attracted tremendous attention due to their outstanding catalytic properties in a wide variety of significant applications (e.g., fuel cells, petroleum cracking and hydrogenation) and superior corrosion resistance [1, [11][12][13][14][15][16]. As a result, great efforts have been devoted to synthesize Pt NPs with controlled shape to tailor their properties such as reactivity and selectivity [11][12][13][14][15].…”

Section: Introductionmentioning

confidence: 99%

“…Among these noble metal NPs, Pt-based NPs have attracted tremendous attention due to their outstanding catalytic properties in a wide variety of significant applications (e.g., fuel cells, petroleum cracking and hydrogenation) and superior corrosion resistance [1, [11][12][13][14][15][16]. As a result, great efforts have been devoted to synthesize Pt NPs with controlled shape to tailor their properties such as reactivity and selectivity [11][12][13][14][15]. For example, cubic Pt NPs exposing (100) surfaces have been found to benefit a wide variety of catalytic reactions [17][18][19][20][21][22][23][24].…”

Section: Introductionmentioning

confidence: 99%

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Shape-controlled synthesis of Pt-Ir nanocubes with preferential (100) orientation and their unusual enhanced electrocatalytic activities

Zhong

Liu

et al. 2014

Sci. China Mater.

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Pt-Ir nanocubes with (100)-terminated facets were synthesized for the first time and their unusual high electrocatalytic activity for a model reaction (i.e., ammonia oxidation) was reported. The key parameters in controlling the shape of the PtIr nanocubes were systematically investigated by transmission electron microscopy (TEM). The electrocatalytic activities of the prepared Pt-Ir and pure Pt nanoparticles (NPs) were characterized by cyclic voltammetry (CV). The results showed that the amount of W(CO) 6 and the volume ratio of oleylamine and oleic acid play a significant role in the development of well-defined Pt-Ir nanocubes. The resultant Pt-Ir nanocubes exhibit (100) orientation, which has been confirmed by not only the structural characterization results from high-resolution TEM (HRTEM) and X-ray diffraction (XRD) but also hydrogen desorption profiles obtained from the CV measurements in H 2 SO 4 solution. Lattice contraction of the Pt-Ir nanocubes were suggested by HRTEM and XRD measurements, and the electronic interactions between Pt and Ir in the Pt-Ir nanocubes were demonstrated by X-ray photoelectron spectroscopy. The Pt-Ir nanocubes show higher specific activity than pure Pt nanocubes and much higher specific activity than the polycrystalline Pt-Ir NPs. The much improved specific activity of the Pt-Ir nanocubes could be attributed to the reason that the introduction of Ir in the Pt-Ir nanocubes largely maintains the highly active Pt (100) sites and thus a positive synergistic effect through the addition of Ir to Pt could be achieved due to the possible bifunctional mechanism and the electronic effect.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Shape-controlled synthesis of Pt-Ir nanocubes with preferential (100) orientation and their unusual enhanced electrocatalytic activities

Zhong

Liu

et al. 2014

Sci. China Mater.

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“…Palladium, nanocrystals, growth, coalescence, surface evolution Metal nanocrystals have attracted growing attention due to their fascinating properties and invaluable applications in catalysis, photonics, sensing, and imaging [1][2][3]. The physicochemical properties of a metal nanocrystal are determined by a set of parameters such as shape, size, and composition.…”

Section: Introductionmentioning

confidence: 99%

New insights into the growth mechanism and surface structure of palladium nanocrystals

et al. 2010

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This paper presents a systematic study of the growth mechanism for Pd nanobars synthesized by reducing Na 2 PdCl 4 with L-ascorbic acid in an aqueous solution in the presence of bromide ions as a capping agent. Transmission electron microscopy (TEM) and high-resolution TEM analyses revealed that the growth at early stages of the synthesis was dominated by particle coalescence, followed by shape focusing via recrystallization and further growth via atomic addition. We also investigated the detailed surface structure of the nanobars using aberration-corrected scanning TEM and found that the exposed {100} surfaces contained several types of defects such as an adatom island, a vacancy pit, and atomic steps. Upon thermal annealing, the nanobars evolved into a more thermodynamically favored shape with enhanced truncation at the corners. KEYWORDSPalladium, nanocrystals, growth, coalescence, surface evolution Metal nanocrystals have attracted growing attention due to their fascinating properties and invaluable applications in catalysis, photonics, sensing, and imaging [1][2][3]. The physicochemical properties of a metal nanocrystal are determined by a set of parameters such as shape, size, and composition. In particular, shape control of a metal nanocrystal can provide a versatile avenue for tailoring its catalytic activity and selectivity because shape determines the arrangements of atoms on the surface [4][5][6][7][8]. For example, it has been shown that Pd nanocubes bounded by {100} facets can provide a four-fold improvement in specific activity for the formic acid oxidation reaction as compared to Pd octahedra bounded by {111} facets [9]. An exquisite shape control of metal nanocrystals is therefore essential for the maximization of their activity and thus their performance in many catalytic and electrocatalytic applications.In order to achieve a high-level control over the shape of metal nanocrystals prepared in a solution phase, a fundamental understanding of nucleation and growth mechanisms is a prerequisite. In the classical models, nanocrystals have been considered to grow by atomic addition [10][11][12]. However, recent experimental and theoretical studies have shown that particle coalescence Nano Res (2010) 3: 180-188 DOI 10.1007/s12274-010-1021-5 Research Article † These two authors contributed equally to this work.Address correspondence to Younan Xia, xia@biomed.wustl.edu; Jingyue Liu, liuj@umsl.edu Nano Res (2010) 3: 180-188 181 can also play an important role in the growth process [13][14][15][16][17]. For instance, oriented attachment was proposed as a growth mechanism to account for the formation of aggregates, nanorods, or nanowires for various metals and metal oxides [18][19][20][21][22][23]. Using in situ transmission electron microscopy (TEM), Alivisatos and co-workers recently provided direct evidence for the involvement of particle coalescence in the growth of Pt nanocrystals [24]. Despite these studies, however, a detailed description of the growth process is still missing, especially for...

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“…Core-shell bimetallic nanoparticles have been extensively studied and widely applied in the heterogeneous catalysis, such as CO oxidation, oxygen reduction reaction and ethanol oxidation [1][2][3][4][5][6][7] . Usually, the shell layers of core-shell nanoparticles are noble metals; therefore the core-shell structures are ideal architectures for reducing dosage of noble metals and improving activity of catalysts.…”

Section: Introductionmentioning

confidence: 99%

Structural Evolution of Plasma-Sputtered Core–Shell Nanoparticles for Catalytic Combustion of Methane

et al. 2011

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Fe@Pd, Fe@Pt and Fe@Au core-shell nanoparticles supported by silicon carbide have been prepared by plasma sputtering deposition, and employed as the catalyst for methane combustion. The core-shell catalysts exhibit higher activities than single metallic catalysts due to surface alloying effects. With the surface alloying of the core-shell nanoparticles, Pd-O and Pt-O bonds become weak because the increasing of electron cloud density around Pd and Pt atoms due to the electron transfer from surface Fe to Pd or Pt atoms. Therefore, the activities of Fe@Pd/SiC and Fe@Pt/SiC increase with the reaction time. Whereas the activity of Fe@Au/SiC keeps invariant in the reaction due to the Fe@Au core-shell structure has high stability. Transmission electron microscopy and X-ray photoelectron spectroscopy results further confirm the structural evolution.

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Designer platinum nanoparticles: Control of shape, composition in alloy, nanostructure and electrocatalytic property

Cited by 1,004 publications

References 184 publications

Shape-controlled synthesis of Pt-Ir nanocubes with preferential (100) orientation and their unusual enhanced electrocatalytic activities

Shape-controlled synthesis of Pt-Ir nanocubes with preferential (100) orientation and their unusual enhanced electrocatalytic activities

New insights into the growth mechanism and surface structure of palladium nanocrystals

Structural Evolution of Plasma-Sputtered Core–Shell Nanoparticles for Catalytic Combustion of Methane

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