Chemical, structural, and morphological characterization of tungsten nanoparticles synthesized by a facile chemical route

Sahoo, Prasanta Kumar; Srinivas, Sarika; Kamal, Kalyan; Durai, L.; Sreedhar, B.

doi:10.1557/jmr.2010.76

Cited by 14 publications

(7 citation statements)

References 30 publications

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“…A typical XRD pattern exhibiting only two broad peaks was obtained for the W nanoparticles on the carbon‐support. The absence of any sharp diffraction peaks in the XRD pattern is due to the amorphous nature of the as‐synthesized W nanoparticles ,,. The XRD data for the W@Pt/C catalyst had four obvious diffraction peaks corresponding to the (111), (200), (220), and (311) planes of the face‐centered cubic (fcc) Pt structure (PDF#65‐2868).…”

Section: Resultsmentioning

confidence: 99%

“…The stronger doublet with peaks at 35.6 and 37.8 eV was assigned to W (0), while the W 4 f doublet with peaks at 38.5 and 40.9 eV was due to the formation of a small amount of tungsten oxide on the surface of the W@Pt/C catalyst. The atomic percentages of W (0) versus oxidized W were 87.9% and 12.1%, respectively ,…”

Section: Resultsmentioning

confidence: 99%

“…The whole preparation process is shown in Figure . First, samples of organic material containing tungsten carbonyl were thermally decomposed and used to synthesize W nanoparticles on carbon supports ,. Next, the W@Pt/C nanoparticles were prepared using a galvanic replacement method without any need for reducing agents.…”

Section: Introductionmentioning

confidence: 99%

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Carbon‐Supported W@Pt Nanoparticles with a Pt‐Enriched Surface as a Robust Electrocatalyst for Oxygen Reduction Reactions

et al. 2018

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A carbon‐supported surface‐platinum‐enriched tungsten nanoparticles (W@Pt/C) is successfully prepared via a replacement method. X‐ray diffraction results verify that the prepared tungsten (W) nanoparticles are amorphous and that platinum (Pt) particles have been successfully placed onto the surface. Transmission electron microscopy shows that the surface‐platinum‐enriched tungsten (W@Pt) nanoparticles are uniformly dispersed on the surface of the carbon support and have an average size of only 1.9 nm. Energy‐dispersive X‐ray spectroscopy reveals that the Pt and W elements are evenly distributed on the surface of the catalyst. Electrochemical measurements confirm that the as‐prepared catalyst exhibits an enhanced catalytic activity for oxygen reduction reaction (ORR) in comparison with commercial catalyst (JM Pt/C). Furthermore, the mass activity of the W@Pt/C catalyst at a potential of 0.9 V/RHE is 2.1 times higher than that of Pt/C (JM). Importantly, the ORR durability of the catalyst is greatly improved as compared to Pt/C (JM). This result may be due to the fact that the mean particle size of the W@Pt/C remains nearly constant during an accelerated durability test. Based on these results, the W@Pt/C maybe a promising cathode catalyst for use in fuel cells.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

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Carbon‐Supported W@Pt Nanoparticles with a Pt‐Enriched Surface as a Robust Electrocatalyst for Oxygen Reduction Reactions

et al. 2018

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“…The key to synthesizing nearly spherical copper powder with uniform shape and particle size is to prepare a uniform and stable emulsion. Surfactants such as sodium dodecyl sulfate, sodium dodecyl benzene sulphonate, nekal, oleic acid, polyvinylpyrrolidone, aliphatic alcohol polyoxyethylene ether (AEO) and tween are often used in the preparation of metal powders [2,4,[6][7][8][9][10]. Nekal and AEO-3, are very cheap, widely used in industry, and can form a stable emulsion after compounding.…”

Section: Introductionmentioning

confidence: 99%

Influence of surfactant interaction on ultrafine copper powder electrodeposition

Yue

Luo

et al. 2019

Materialwissenschaft Werkst

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Ultrafine copper powder with uniform morphology and size was synthesized by electrodeposition. By using the Box‐Behnken design of response surface methodology, to study the interaction between anionic surfactants and nonionic surfactants at different concentrations of copper sulfate pentahydrate. The resulting copper powder was characterized by scanning electron microscopy. The results show that it is difficult to obtain uniform copper powder by using a single anionic surfactant. The staggered adsorption mechanism of the non‐ionic surfactant and the anionic surfactant at the interface disperses and stabilizes the micellar interface and prevents continued growth of the copper powder. The resulting copper powder is nearly spherical with uniform morphology and particle size. Through the optimization of the response surface methodology, a nearly spherical copper powder with an average particle size of 0.61 μm and uniform shape was finally obtained.

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“…1 Recently, tungsten is also intensively considered for applications in nanoscale devices such as contact plugs, electron emitters, and memory devices. [5][6][7][8][9][10] The important benefits of W usage in nanoelectronics include such its properties as chemical stability with silicon, inherently low vapor pressure at high temperatures and unusual quantum confinement.…”

Section: Introductionmentioning

confidence: 99%

W and two-dimensional WO₃/W nanocrystals produced by controlled self-sustaining reduction of sodium tungstate

et al. 2013

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The influence of calcium fluoride (CaF 2 ) on combustion characteristics of Na 2 WO 4 1 3 Mg system and microstructure of the produced W and WO 3 /W crystals is investigated. The results of thermodynamic analysis and experimental investigations show that CaF 2 simultaneously enhances the conversion of Na 2 WO 4 toward tungsten and binds sodium through the formation of NaF phase. The examination of the microstructure of quenched combustion products and differential scanning calorimetry analysis indicate that at early stages of combustion, a part of Na 2 WO 4 is reduced by Mg to tungsten, whereas another part reacts with CaF 2 forming CaWO 4 and NaF. Subsequent magnesium reduction of CaWO 4 significantly increases the overall temperature of the combustion process. Such modification in reaction mechanism coupled with postcombustion processing (e.g., acid/basic treatment) of the product allows us to produce either pure tungsten nanocrystals or tungsten oxide-tungsten nanostructures consisting of two-dimensional WO 3 nanoflakes assembled on a W core. It is found that CaF 2 does not influence the sizes of tungsten nanocrystals. However, since the addition of CaF 2 leads to the increase of overall reaction temperature, it facilitates the formation of W particles with equilibrium crystal shape by faceting process.

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Chemical, structural, and morphological characterization of tungsten nanoparticles synthesized by a facile chemical route

Abstract: Abstract

Cited by 14 publications

References 30 publications

Carbon‐Supported W@Pt Nanoparticles with a Pt‐Enriched Surface as a Robust Electrocatalyst for Oxygen Reduction Reactions

Carbon‐Supported W@Pt Nanoparticles with a Pt‐Enriched Surface as a Robust Electrocatalyst for Oxygen Reduction Reactions

Influence of surfactant interaction on ultrafine copper powder electrodeposition

W and two-dimensional WO₃/W nanocrystals produced by controlled self-sustaining reduction of sodium tungstate

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Chemical, structural, and morphological characterization of tungsten nanoparticles synthesized by a facile chemical route

Abstract: Abstract

Cited by 14 publications

References 30 publications

Carbon‐Supported W@Pt Nanoparticles with a Pt‐Enriched Surface as a Robust Electrocatalyst for Oxygen Reduction Reactions

Carbon‐Supported W@Pt Nanoparticles with a Pt‐Enriched Surface as a Robust Electrocatalyst for Oxygen Reduction Reactions

Influence of surfactant interaction on ultrafine copper powder electrodeposition

W and two-dimensional WO3/W nanocrystals produced by controlled self-sustaining reduction of sodium tungstate

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Product

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W and two-dimensional WO₃/W nanocrystals produced by controlled self-sustaining reduction of sodium tungstate