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Showing 1 to 17 of 17 for “"Palladium nanoparticles"”.
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Continuous synthesis of metallic and oxidic palladium nanoparticles with tunable sizes for catalytic applications
… engines and use platinum group metals, such as palladium, as the active catalyst materials and oxides such as cerium dioxide as support. Palladium and palladium-based cerium dioxide catalysts have been extensively studied in three-way catalysis due to their excellent catalytic properties. …
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Catalytic Reduction of NO and N2O with Hydrogen in Water by Polymer-Protected Palladium Nanoparticles
… gases to harmless dinitrogen by nanoparticulate palladium catalysts is a promising method for treating NO and N2O formed in water. However, creating a better understanding of the method of catalytic activity and corresponding selectivity is critical for developing an optimal process. We have …
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Arc-discharge In Solution: A Novel Synthesis Method For Carbon Nanotubes And In Situ Decoration Of Carbon Nanotubes With Nanoparticles
… various parameters during synthesis of selected nanoparticles can be used to fabricate technologically important components. During the last decade, carbon nanotubes (CNTs) have been envisioned for a host of different new applications. Although carbon nanotubes can be synthesized using a variety …
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Characterization of Anodic Fuel Cell Catalysts Utilizing Various Surface Sensitive Techniques
… Pt/Pd catalyst was optimized. The optimum palladium coverage for unsupported platinum black was theta = 0.79, whereas for carbon-supported platinum black it was theta = 1.39. The catalyst was also inspected via EC-IRAS, which indicated the presence of palladium on the surface and smaller …
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Sintering of metal nanoparticles on model substrates
… these precious metal catalysts sinter, the metal nanoparticles grow, which in return causes a loss in the overall surface area from loss of the number of available reaction sites. At high temperatures, sintering as a thermally activated process occurs more rapidly and the energetics of the sample …
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Palladium (pd) decorated zinc oxide (ZnO) nanoparticles for gas sensing applications: meat spoilage gases
… to this, materials of ZnO decorated with palladium nanoparticles were synthesised using the hydrothermal method for the purpose of testing their gas sensing properties. After the synthesis of these nanoparticles, various characterization techniques for the investigation of both physical …
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Electrochemistry of formic acid and carbon dioxide on metal electrodes with applications to fuel cells and carbon dioxide conversion devices
… increases the rate of formic acid oxidation on palladium and platinum. It is also shown that an increase in fuel pH decreases the potential at which the catalyst poison is removed from the electrode surface. This poison is detrimental to fuel cell operation. This work reports the first such …
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Hydrogen Cryosorption of Micro-Structured Carbon Materials
… surface area of 700 m2/g, were decorated with palladium nanoparticles in different compositions. The growth and distribution of doped palladium particles in the carbon substrates were studied, and their effects on porous properties and microstructures of the sorbents were also reviewed. …
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Galvanic Displacement Across Single-Layer Graphene
… of graphene, specifically by investigating palladium deposition on graphene on a copper foil substrate via galvanic displacement between the copper and palladium (II) ions in solution. To understand palladium nanoparticle deposition and determine how this process can be controlled, …
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Adatom Emission From Nanoparticles: Implications for Ostwald Ripening
… been used to study the evolution of platinum and palladium nanoparticles. Both a statistical and a microscopic approach have been used to understand the ways in which Pd affects Pt. The catalytic activity and kinetics of various monometallic as well as bimetallic powder catalysts aged under …
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Interaction of azobenzene containing surfactants with plasmonic nanoparticles
… I investigate the complexes between noble metal nanoparticles and cationic surfactants containing azobenzene units in their hydrophobic tail, employing absorption spectroscopy, surface zeta-potential, and electron microscopy. In the first part of the thesis, the formation of complexes between …
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A Computational Framework for Long-Term Atomistic Analysis of Solute Diffusion in Nanomaterials
… that simulate hydrogen mass transport in palladium. Specifically, the framework is validated against a classical lattice random walk model. Its capability to capture the atomic details in nanomaterials over a long diffusive time scale is also demonstrated. In these experiments, the effects …
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The Formation of Metal Nanoparticle-Carbon Nanotube Composite Materials for the Non-enzymatic Detection of Glucose
Nano composite materials consisting of gold nanoparticles (AuNPs) and functionalised multiwalled carbon nanotubes (fMWCNTs) were initially prepared using simple synthetic reduction methods, involving the chemical agents sodium borohydride and trisodium citrate. These composites were named …
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Complexing Carbon Nanomaterials and Reactive Metal Species for Selective Chemical Sensing and Tunable Catalysis
… poly(arylene ether)s (PAEs) show to limit the palladium nanoparticles (Pd NPs) growth and stabilize the Pd NPs dispersion. SWCNT-based chemiresistors and graphene field-effect transistors (GFETs) using these PAE-supported small Pd NPs are sensitive, selective, and robust sensory materials for …
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Development of transition metal-catalyzed C-S and C-C cross-coupling reactions
… The synthesis and catalytic studies of novel palladium nanostructures assembled from small nanoparticles by a surfactant-templated method are described in Chapter 5. The nanomaterials were characterized by several techniques including XRD, SEM, and HRTEM, which reveal that these …
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Atomic Modelling of Disorder in Metal Nanocrystals
… relevance of the MSRD in X-ray scattering from nanoparticles. In particular, in Total Scattering methods (Pair Distribution Function and Debye Scattering Equation), which rely on an atomistic description of the nanoparticles, the MSRD is the key to distinguish dynamic (thermal) and static …
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DNA as a functional molecule for control of nanomaterial morphology and for biosensing
… merit in exploring the synthesis of noble metal nanoparticles with different shapes and exposed surfaces. In chapter 2, the facile synthesis and the growth mechanism of high-index faceted tetrahexahedral palladium nanoparticles via an early stage underpotential deposition of silver in the …