نتایج جستجو برای: platinum nanoparticles

تعداد نتایج: 127093  

Journal: :Applied Nanoscience 2021

Abstract Nanoparticles of noble metals and their alloys are particular interest for biomedicine catalysis applications. The method laser ablation bulk in liquids gives facile access to such particles as high-purity colloids is already used industrial research. However, the still lacks sufficient productivity implementation into series production. use innovative technology may help further disse...

2016
Sung Bo Lee Jucheol Park Peter A van Aken

As is well documented, platinum nanoparticles, promising for catalysts for fuel cells, exhibit better catalytic activities, when alloyed with Zn. Pre-existing syntheses of Pt-Zn alloy catalysts are composed of a number of complex steps. In this study, we have demonstrated that nanoparticles of Pt-Zn alloys are simply generated by electron-beam irradiation in a transmission electron microscope o...

2007
Petra Bele

Transmission electron microscopy is the state-of the art technique for the study of particle size and size distribution in model catalyst systems. We have investigated platinum nanoparticles supported on glassy carbon. Our novel approach was to vary the size of nanoparticles allowing us to produce particles in the range 1 to 5 nm with a very narrow size distribution. To avoid the problems arisi...

2016
Giovanna Testa Laura Fontana Iole Venditti Ilaria Fratoddi

In this work, the synthesis and characterization of functionalized platinum nanoparticles (PtNPs) have been investigated. PtNPs were obtained by a wet redox procedure using 2-diethylaminoethanethiol hydrochloride (DEA) as capping agent. By varying the Pt/thiol molar ratio, monodispersed and stable particles with diameters in the range of 3-40 nm were isolated. The amino functionality allows neu...

In the present study, molecular dynamics simulations have been utilized to provide fundamental understanding of melting behavior of pure Pd and Pt nanoparticles with the size of 10 nm in diameter, both free and graphene-supported during continuous heating. The embedded atom method is employed to model the metal-metal interactions, whereas a Lennard-Jones potential is applied to describe the met...

2015
Celia García-Hernández Cristina García-Cabezón Cristina Medina-Plaza Fernando Martín-Pedrosa Yolanda Blanco José Antonio de Saja María Luz Rodríguez-Méndez

Two different methods were used to obtain polypyrrole/AuNP (Ppy/AuNP) composites. One through the electrooxidation of the pyrrole monomer in the presence of colloidal gold nanoparticles, referred to as trapping method (T), and the second one by electrodeposition of both components from one solution containing the monomer and a gold salt, referred to as cogeneration method (C). In both cases, el...

2016
Jason A. Varnell Edmund C. M. Tse Charles E. Schulz Tim T. Fister Richard T. Haasch Janis Timoshenko Anatoly I. Frenkel Andrew A. Gewirth

The widespread use of fuel cells is currently limited by the lack of efficient and cost-effective catalysts for the oxygen reduction reaction. Iron-based non-precious metal catalysts exhibit promising activity and stability, as an alternative to state-of-the-art platinum catalysts. However, the identity of the active species in non-precious metal catalysts remains elusive, impeding the developm...

Journal: :Proceedings of the National Academy of Sciences of the United States of America 2012
Ioana Dumitrescu Richard M Crooks

Here we report on the effect of the mass transfer rate (k(t)) on the oxygen reduction reaction (ORR) catalyzed by Pt dendrimer-encapsulated nanoparticles (DENs) comprised of 147 and 55 atoms (Pt(147) and Pt(55)). The experiments were carried out using a dual-electrode microelectrochemical device, which enables the study of the ORR under high k(t) conditions with simultaneous detection of H(2)O(...

Journal: :Chemical communications 2014
Ehab N El Sawy Hany A El-Sayed Viola I Birss

The surface composition of nanoparticles is critical in defining their chemical and electrochemical properties. However, there are a limited number of tools that can rapidly and reliably establish these important characteristics at this small scale. In the present work, a series of Rucore@Ptshell nanoparticles (2 or 3 nm diameter Ru core, 0 to 2 monolayers of Pt in the shell layer) were synthes...

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