Monodisperse 8 nm Pt nanocubes are synthesized by reducing Pt(acac)2 in the presence of oleic acid, oleylamine, and a trace amount Fe(CO)5. Self-assembly these results (100) textured array. The show an enhanced catalysis toward oxygen reduction, their specific activity is over twice as high that from commercial nanoparticles.

We report the structure-controlled synthesis of FePt/MgO NPs and their catalysis for oxygen reduction reaction (ORR) in 0.5 M H(2)SO(4) solution. The yields fcc-FePt/MgO fct-FePt/MgO with MgO coating being readily removed catalytic studies. fct-FePt show higher activity durability than fcc-FePt ORR condition. results indicate that fully ordered could serve as a practical Pt-based catalyst fuel cell applications.

This paper presents the use of Ca2Mn2O5 as an oxygen-deficient perovskite electrocatalyst for oxygen evolution reaction (OER) in alkaline media. Phase-pure was made under mild temperatures through a reductive annealing method. deficient can catalyze generation at ~1.50 V versus (vs) reversible hydrogen electrode (RHE) electrochemically, and reach OER mass activity 30.1 A/g 1.70 (vs RHE). In comparison to CaMnO3, shows higher activities. The molecular level vacancies high spin electron...

Development of acid-stable electrocatalysts with low overpotential for oxygen evolution reaction (OER) is a major challenge to produce hydrogen directly from water. We report in this paper pyrochlore yttrium ruthenate (Y2Ru2O7-δ) electrocatalyst that has significantly enhanced performance toward OER acid media over the best-known catalysts, an onset 190 mV and high stability 0.1 M perchloric solution. X-ray absorption near-edge structure (XANES) indicates Y2Ru2O7-δ had valence state favors...

Monodisperse FePt nanocubes are synthesized at 205 degrees C by controlling decomposition of Fe(CO)5 and reduction Pt(acac)2 addition sequence oleic acid oleylamine. Different from the assembly sphere-like nanoparticles, which shows 3D random structure orientation, self-assembly leads to a superlattice array with each cube exhibiting (100) texture. Thermal annealing converts chemically disordered fcc ordered fct FePt, annealed strong (001) texture in directions both parallel perpendicular...

Length made to order: Controlled reduction of [Pt(acac)2] and decomposition [Fe(CO)5] in a mixture oleylamine octadecene leads the facile synthesis FePt nanowires nanorods with diameters 2–3 nm (see TEM image). The length nanowires/nanorods is tunable from greater than 200 down 20 by simply controlling volume ratio octadecene.

The catalytic activities of FexPt100-x alloy nanoparticles at different compositions (x = 10, 15, 42, 54, 58, and 63) in the electro-oxidation formic acid have been investigated by using cyclic voltammetry (CV), chronoamperometry, electrochemical impedance spectroscopy (EIS). It was observed that electrocatalytic performance strongly dependent on FePt particle composition. In chronoamperometric measurements, particles x ≈ 50 showed highest steady-state current density among catalysts under...

FexPt100-x nanoparticles of different compositions (x = 63, 58, 54, 42, 15, and 0) were prepared loaded onto a glassy carbon (GC) electrode where their catalytic activities in the electroreduction oxygen examined compared. Cyclic rotating disk voltammetric studies resulting FexPt100-x/GC electrodes showed that activity for reduction exhibited peak-shape dependence on particle composition (x). Among series nanocatalysts under study, Fe42Pt58 particles maximum O2 terms overpotential current...

Chemically disordered face centered cubic (fcc) FePt nanoparticles (NPs) show the controlled release of Fe in low pH solution. The released catalyzes H2O2 decomposition into reactive oxygen species within cells, causing fast oxidation and deterioration cellular membranes. Functionalized with luteinizing hormone-releasing hormone (LHRH) peptide via phospholipid, fcc-FePt NPs can bind preferentially to human ovarian cancer cell line (A2780) that overexpresses LHRH receptors exhibit high...

A simple method to produce ferromagnetic FePt nanoparticle dispersions by thermal annealing of core/shell-structured FePt/MgO nanoparticles and removal MgO in the presence hexadecanethiol oleic acid is reported. The have a room temperature coercivity 1 T magnetization 56.4 emu per gram FePt, are suitable for single-particle magnetism studies other magnetic applications.

Abstract A robust porous structure is often needed for practical applications in electrochemical devices, such as fuel cells, batteries, and electrolyzers. While templating approach useful the preparation of materials general, it not effective synthesis oxide‐based electrocatalysts owing to chemical instability disordered thus created. Now phase‐pure yttrium ruthenate pyrochlore oxide using an unconventional porogen perchloric acid presented. The lattice oxygen defects are formed by...

Porous lanthanum cobaltite (LaCoO3) was prepared by hydrothermal reaction and converted into hollow nanospheres through heat treatment. These spheres were examined as electrocatalysts toward oxygen evolution (OER) using the rotating disk electrode technique in an alkaline solution. The obtained mass-specific OER activity 7.51 A/g for porous LaCoO3 particles 12.58 at 1.60 V. values more than 4–6 times higher that of bulk compound (1.87 A/g). performance these perovskite-type compounds...

The electrocatalytic oxidation of formic acid at a gold electrode functionalized with FePt nanoparticles was studied by cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS) in mixed solution 0.1 M HCOOH HClO4. bimetallic nanoparticles, mean diameter 3 nm, were prepared chemical reduction method. Au/FePt nanostructured firstly the deposition onto clean Au surface, followed ultraviolet ozone treatment to remove organic coating. In CV measurements, two well-defined anodic...

This paper reports an improved synthesis of hard magnetic fct-FePt nanoparticles (NPs) from reductive annealing fcc-FePt/Fe3O4/MgO NPs followed by MgO removal. The fcc-FePt/Fe3O4 are made a one-pot reaction Pt(acac)2 with Fe(CO)5 in the presence oleic acid and oleylamine coated layer via thermal decomposition Mg(acac)2. coating prevents FePt sintering under high temperature conditions. obtained 650 °C show coercivity value 2 T at 300 K, suitable for various nanomagnetic applications.

Single-phase pyrochlore-type Y2Ir2O7 electrocatalyst was made through the sol–gel synthesis. This catalyst has high activity and stability toward oxygen evolution reaction (OER) in acid. Chronopotentiometry analysis shows no major changes overpotential for more than 24 h measurement at 10 mA/cm2geo. Transmission electron microscopy formation of a new shell layer after OER tests. X-ray absorption spectroscopy (XAS) used to examine single-electron filling e″ orbital Ir 5d states, which could...

Nickel boride (Ni2B) is known to be an excellent catalyst for hydrogenation of olefin structures under mild reaction conditions. Its susceptibility oxidation in air environments, however, limits its practical applications. Here, a hydrazine-passivated nickel boride/nickel (NiBx/Ni) heterostructured developed address the problem while improving conversion efficiency styrene ethylbenzene real polystyrene (PS) pyrolysis oil. The calculated turnover frequency 24.9 mmol/h·g, with 99.9%...

The electro-oxidation of formic acid catalyzed by Fe20Pt80 nanoparticles was studied cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS) where the particles were deposited onto a gold electrode surface Langmuir−Blodgett (LB) technique at varied film thickness/coverage. It found that particle assembly thickness strongly affected electrocatalytic activity for HCOOH oxidation. For single monolayer two layers FePt particles, extensive CO adsorption (poisoning) observed in CV...

Abstract A robust porous structure is often needed for practical applications in electrochemical devices, such as fuel cells, batteries, and electrolyzers. While templating approach useful the preparation of materials general, it not effective synthesis oxide‐based electrocatalysts owing to chemical instability disordered thus created. Now phase‐pure yttrium ruthenate pyrochlore oxide using an unconventional porogen perchloric acid presented. The lattice oxygen defects are formed by...

Länge auf Bestellung: Die kontrollierte Reduktion von [Pt(acac)2] und Zersetzung [Fe(CO)5] in einer Mischung aus Oleylamin Octadecen ermöglicht eine einfache Synthese FePt-Nanodrähten -Nanostäbchen mit Durchmessern 2 bis 3 nm (siehe TEM-Bild). der Nanodrähte/Nanostäbchen lässt sich einfach über das Volumenverhältnis mehr als 200 herunter zu 20 einstellen. Supporting information for this article is available on the WWW under http://www.wiley-vch.de/contents/jc_2001/2007/z702001_s.pdf or from...

Hexane solutions of Fe3O4 and FePt nanoparticles (NPs) having both oleylamine oleic acid as surfactants were surface modified by treatment with a DMSO solution [(η6-hydroquinone)Mn(CO)3]BF4, which is readily deprotonated the to [(η5-semiquinone)Mn(CO)3]. The latter complex binds NP replacing protonated oleylamine, likely forms bilayer alkyl chains on surface. resulting surface-modified assembly soluble in DMSO. With nanoparticles, [(η5-semiquinone)Mn(CO)3] coordinates Pt atoms IR frequency...

Abstract Fe 3 BO 5 nanorods with diameters from 4 nm to 16 and length 43 60 are synthesized by a facile thermal decomposition of iron acetylacetonate t ‐butylamine borane (TBAB). TBAB is used control the 1D growth aspect ratio nanorods. These antiferromagnetic T N = 174 K, which higher than that bulk (114 K).

We aim to fabricate a ZnCo layered double hydroxide (LDH) nanostructure through facile one-pot hydrothermal synthesis.ZnCo LDH with interconnected hexagonal sheets having ultrathin thickness voids are synthesized for the effective penetration of electrolytes achieve superior electrochemical properties.The as-synthesized is then subjected structural, morphological, phase, and studies.As an electrode supercapacitor, has areal capacitance 1964 mFcm -2 at 5 mVs -1 scan rate, energy density 0.22...