Advertisement

Topics

Bimetallic Pt-Pd nano-catalyst: size, shape and composition matter.

08:00 EDT 9th April 2019 | BioPortfolio

Summary of "Bimetallic Pt-Pd nano-catalyst: size, shape and composition matter."

The goal of this work is to understand how the phase diagram of the platinum-palladium (Pt-Pd) alloy changes with size and shape and how it correlates with catalytic properties. By using nano-thermodynamics, the size and shape effects on the phase diagram of Pt-Pd nanoparticles were determined theoretically. The phase diagram of some nanoparticles (sphere, tetrahedron, octahedron, decahedron, cube, cuboctahedron and rhombic dodecahedron) exhibits a congruent melting point that becomes more and more pronounced when the size decreases. At the right of the congruent melting point i.e. close to the Pt-rich side, the coexistence region exhibits a contraction while an expansion is noticed at larger palladium concentrations. From the Gibbs free energy analysis, the stability of all the considered shapes has been determined versus temperature and composition. Furthermore, the surface segregation was also calculated and it is shown that the surface segregation is reversed at very small sizes. Indeed, below a critical size, Pd does not segregate anymore at the surface like it normally does for larger nanoparticles; but Pt does. The critical size range has been determined for each considered shape; and within this range Pt and Pd co-exist at the surface. Finally, the most catalytically active shapes are predicted to be the tetrahedron and the cube in agreement with the available experimental data and other theoretical results.

Affiliation

Journal Details

This article was published in the following journal.

Name: Nanotechnology
ISSN: 1361-6528
Pages:

Links

DeepDyve research library

PubMed Articles [11457 Associated PubMed Articles listed on BioPortfolio]

Formation and Functioning of Bimetallic Nanocatalysts: The Power of X-ray Probes.

Bimetallic nanocatalysts are key enablers of current chemical technologies, including car exhaust converters and fuel cells, and play a crucial role in industry to promote a wide range of chemical rea...

Shape-controlled nanoparticles in pore-confined space.

Increasing the catalyst's stability and activity are one of the main quests in catalysis. Tailoring crystal surfaces to a specific reaction has demonstrated to be a very effective way in increasing th...

Strategies to enhance the stability of nanoscale zero-valent iron (NZVI) in continuous BrO reduction.

The reduction of bromate to bromide was successfully achieved by bimetallic catalysts with NZVI support in continuous-flow reactors. The stability of NZVI-supported bimetallic catalysts was enhanced b...

Hierarchically built hyaluronic nano-platelets have symmetrical hexagonal shape, flattened surfaces and controlled size.

Most of nanomaterials composed of hyaluronic acid (HA) used for drug targeting are spherical. In this investigation, we suggest that the morphology of HA nanomaterials could be considered as a new par...

Elucidation of stoichiometric efficiency, radical generation and transformation pathway during catalytic oxidation of sulfamethoxazole via peroxymonosulfate activation.

In this work, nano-bimetallic Co/Fe oxides with different stoichiometric Co/Fe ratios were prepared using a novel one-step solution combustion method. The nano-bimetallic Co/Fe oxides were used for su...

Clinical Trials [2527 Associated Clinical Trials listed on BioPortfolio]

Nano-Pulse Stimulation (NPS) in Sebaceous Hyperplasia

This prospective, open label, muti-center study evaluates the use of Nano-Pulse Stimulation (NPS) in the treatment of Sebaceous Hyperplasia (SH) lesions less than 2.5mm in size.

PK of Efavirenz & Lopinavir Nano-formulations in Healthy Volunteers

This study is an open-label, prospective pharmacokinetic study investigating two antiretroviral agents in parallel and employing an adaptive design with two stages, whereby the results obt...

Clinical Efficacy in Relieving Dentin Hypersensitivity of Nanohydroxyapatite-Containing Toothpastes and Cream

This study will investigate the effectiveness of nanohydroxyapatite (nano-HAP)-containing toothpastes and cream to relieve dentin hypersensitivity, comparing it with those of a commercial ...

Nano-Pulse Stimulation (NPS) in Seborrheic Keratosis Study

The primary purpose of this trial is to evaluate Nano-Pulse Stimulation (NPS) to clear or remove Seborrheic Keratosis (SK) lesions from off-facial areas of healthy adult subjects.

Effect of Nano-hydroxyapatite and LASER on Dentin Hypersensitivity

The aim of this study was to evaluate the effect of nanohydroxyapatite associated with low potency laser therapy in eliminating or reducing dentin hypersensitivity in a randomized placebo-...

Medical and Biotech [MESH] Definitions

The series of changes to the shape, size, components, and functions of an individual organism that occur over time as the organism progresses from its initial form to full size and maturity.

A condition in which the ocular image of an object as seen by one eye differs in size and shape from that seen by the other.

The scientific study of variations in size, shape, and proportion of the cranium.

Alterations or deviations from normal shape or size which result in a disfigurement of the foot.

Alterations or deviations from normal shape or size which result in a disfigurement of the hand.

Advertisement
Quick Search
Advertisement
Advertisement

 


DeepDyve research library

Relevant Topic

Collaborations in biotechnology
Commercial and academic collaborations are used throughout the biotechnology and pharmaceutical sector to enhance research and product development. Collaborations can take the form of research and evaluation agreements, licensing, partnerships etc. ...


Searches Linking to this Article