Sonochemical Formation of Intermetallic Coatings

Sweet, J. D.; Casadonte, Dominick J.

doi:10.1021/cm00047a035

Cited by 8 publications

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“…In this report, we discuss electrocatalytic properties of PtRu nanoparticles that possess stable bulk alloy characteristics. The PtRu nanoparticles were synthesized with the aid of sonochemistry. − The high local temperatures generated by acoustic cavitation during sonication can exceed the melting point of most metals, , and the extreme rates of cooling enhance the formation of nanometric materials . Thus, sonochemistry provides a potential route to nanometer scale catalyst particles with uniform PtRu composition.…”

Section: Introductionmentioning

confidence: 99%

PtRu Nanoparticle Electrocatalyst with Bulk Alloy Properties Prepared through a Sonochemical Method

Basnayake

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et al. 2006

Langmuir

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Properties of PtRu nanoparticles prepared using high-intensity sonochemistry are reported. Syntheses were carried out in tetrahydrofuran (THF) containing Ru3+ and Pt4+ in a fixed mole ratio of either 1:10 or 1:1. X-ray diffraction measurements confirmed sonocation produces an alloy phase and showed that the composition of the nanometer scale metal particles is close to the mole fraction of Ru3+ and Pt4+ in solution with deviations that tend toward Ru enrichment in the alloy phase. The materials gave responses that are similar in terms of peak potential and current density, referenced to the catalyst active surface area, to those of bulk alloys in voltammetry experiments involving CO stripping and CH3OH electrochemical oxidation in 0.1 M H2SO4. The results show that sonochemical methods have the potential to produce nanometer scale bimetallic electrocatalysts that possess alloy properties. The materials have application in mechanistic studies of fuel cell reactions and as platforms for the development of CO tolerant fuel cell catalyst.

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Section: Introductionmentioning

confidence: 99%

PtRu Nanoparticle Electrocatalyst with Bulk Alloy Properties Prepared through a Sonochemical Method

Basnayake

Katar

et al. 2006

Langmuir

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“…For example, for an aqueous solution, water molecules can be broken into hydrogen atoms (H ) and hydroxyl radicals (OH ). Based on this mechanism, sonochemistry has been widely applied to the synthesis of metals, [10][11][12][13][14] oxides, 12,15-17 sulfides [18][19][20][21] and others. [22][23][24][25][26] However, no sonochemical synthesis of any pure metal hydrides has been reported yet.…”

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confidence: 99%

Sonochemical synthesis of copper hydride (CuH)

Hasin

2012

Chem. Commun.

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“…To synthesize the LaNiO 3 catalysts with possible variations in defect types, we employed a sonochemical approach. Synthesis by sonochemistry offers the opportunity to modulate the ultrasound intensity and exposure time, variables that are known to affect crystal surface properties, − to acquire the desired material properties.…”

Section: Introductionmentioning

confidence: 99%

Sonochemically Prepared Ni-Based Perovskites as Active and Stable Catalysts for Production of CO_x-Free Hydrogen and Structured Carbon

et al. 2023

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A sonochemical method is employed to synthesize LaNiO3 perovskites as catalysts for methane decomposition to produce clean CO x -free hydrogen and structured carbon. The catalytic activities of perovskites prepared under various sonochemical conditions (different power densities and exposure times) are contrasted with those of LaNiO3 prepared by a conventional sol–gel method. The results show that a sonochemically prepared catalyst presents a methane conversion of up to 60% after 16 h of reaction, while the conventional sol–gel LaNiO3 catalyst deactivates quickly, reaching 1% methane conversion after 30 min of reaction. Structural characterization of the as-prepared materials indicates that under certain sonochemical conditions (low-intensity sonication for 8 h) it is possible to obtain NiO inclusions in the LaNiO3 perovskite structure, which are not present when employing the conventional synthesis technique. Upon activation of these materials under reducing conditions, it is found that the presence of the sonochemically formed NiO inclusions facilitates exsolution of the reduced Ni species to the surface of the catalyst particles, improving the catalyst activity in methane decomposition. The sonochemically synthesized catalysts, which exhibit coexistence of LaNiO3 phase and NiO inclusions, also seem to exhibit autocatalytic properties as they steer the methane decomposition reaction toward formation of non-encapsulating carbon nanotubes, which not only enhance catalyst stability but also increase the catalyst activity over long reaction times.

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Sonochemical Formation of Intermetallic Coatings

Cited by 8 publications

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PtRu Nanoparticle Electrocatalyst with Bulk Alloy Properties Prepared through a Sonochemical Method

PtRu Nanoparticle Electrocatalyst with Bulk Alloy Properties Prepared through a Sonochemical Method

Sonochemical synthesis of copper hydride (CuH)

Sonochemically Prepared Ni-Based Perovskites as Active and Stable Catalysts for Production of CO_x-Free Hydrogen and Structured Carbon

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Sonochemical Formation of Intermetallic Coatings

Cited by 8 publications

References 0 publications

PtRu Nanoparticle Electrocatalyst with Bulk Alloy Properties Prepared through a Sonochemical Method

PtRu Nanoparticle Electrocatalyst with Bulk Alloy Properties Prepared through a Sonochemical Method

Sonochemical synthesis of copper hydride (CuH)

Sonochemically Prepared Ni-Based Perovskites as Active and Stable Catalysts for Production of COx-Free Hydrogen and Structured Carbon

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Product

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Sonochemically Prepared Ni-Based Perovskites as Active and Stable Catalysts for Production of CO_x-Free Hydrogen and Structured Carbon