Surface enrichment of Pt in stable Pt-Ir nano-alloy particles on MgAl2O4 spinel in oxidizing atmosphere
نویسندگان
چکیده
منابع مشابه
Catalytic activity of Pt nano-particles for H2 formation
Associative desorption of hydrogen at edges and facets on Pt nano-particles was studied using density functional theory. The goal was to identify catalytically active sites on Pt nano-particles for the hydrogen evolution reaction. Since nano-particles used in catalysis typically contain over a thousand atoms, calculations of whole particles are too demanding and the adsorption sites were instea...
متن کاملSURFACE SELF-DIFFUSION OF Pt ON THE Pt(311) PLANE
The sur face d i f fus ion of s ing le P t atoms and P t c l u s t e r s on t h e channe led (31 1 ) p l a n e of Pt has been inves t iga ted by f i e l d ion microscopy. Single atoms were found t o migrate within a given channel of the (31 1 ) plane a t t empera tures above 215 K with an ac t iva t ion energy of 0.60 k 0.03 eV and a d i f f u s i v i t y of 1 .9 X 10-* cm2/sec. No c ross -chan...
متن کاملCompositional Inhomogeneity and Corner Enrichment of Pt in Pt/Pd Bimetallic Nanoparticles
Experimental results of a smooth composition gradient within Pt/Pd alloy nanoparticles with Pt enrichment at the corners are reported. We find that the Pt concentration gradually increases toward the outermost surface, and it appears different from the thermodynamically most stable configuration. We demonstrate that it is the result of reaction kinetics of both the reduction of precursors and g...
متن کاملIn-situ synthesis and characterization of conducting metal — polyaniline nanocomposites
Metal—Polyaniline nanocomposites such as Platinum-Polyaniline nanocomposite is prepared by insitu oxidative polymerization of aniline and reduction of Pt+4 ions into Pt nanoparticles. Thepolymerization of aniline was carried out in the presence of 1(2PtCN6 [Potassium Hexa CyanoPlatinate (IV)] as oxidizing agent. During the reaction aniline monomers undergo oxidation andform polyaniline (PANT) w...
متن کاملInfluence of embedding Cu nano-particles into a Cu/SiO2/Pt structure on its resistive switching
Cu nano-particles (Cu-NPs) were embedded into the SiO2 layer of a Cu/SiO2/Pt structure to examine their influence on resistive switching characteristics. The device showed a reversible resistive switching behavior, which was due to the formation and rupture of a Cu-conducting filament with an electrochemical reaction. The Cu-NPs enhanced the local electric field within the SiO2 layer, which cau...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
ژورنال
عنوان ژورنال: Catalysis Communications
سال: 2017
ISSN: 1566-7367
DOI: 10.1016/j.catcom.2017.01.012