Preparation of PtNi Nanoparticles for the Electrocatalytic Oxidation of Methanol

Carbon supported PtNi nanoparticles were prepared by hydrazine reduction of Pt and Ni precursor salts under different conditions, namely by conventional heating (PtNi-1), by prolonged reaction at room temperature (PtNi-2) and by microwave assisted reduction (PtNi-3). The nanocomposites were characterized by XRD, EDX, XPS and TEM and used as electrocatalysts in direct methanol fuel cell (DMFC) reactions. Investigations into the mechanism of PtNi nanoparticle formation revealed that platinum nanoparticle seeding was essential for the formation of the bimetallic nanoparticles. The average particle size of PtNi prepared by microwave irradiation was the lowest, in the range of 2.9 – 5.8 nm. The relative rates of electrooxidation of methanol at room temperature as measured by cyclic voltammetry showed an inverse relationship between catalytic activity and particle size in the following order PtNi-1 < PtNi-2 < PtNi-3.Singapore-MIT Alliance (SMA

Single Stranded DNA Induced Assembly of Gold Nanoparticles

The binding affinity of single stranded DNA (ssDNA) for gold nanoparticle surface is studied in this work. The data indicate that the strength of interaction between ssDNA and Au particle surface is closely related to the particle size, with smaller particles (5 nm) producing the most pronounced effects. From these experimental findings, a single stranded DNA (ssDNA) based method to assimilate 13 and 5 nm gold nanoparticles was developed, and verified by transmission electron microscopy (TEM).Singapore-MIT Alliance (SMA

Ni-based bimetallic heterogeneous catalysts for energy and environmental applications

Bimetallic catalysts have attracted extensive attention for a wide range of applications in energy production and environmental remediation due to their tunable chemical/physical properties. These properties are mainly governed by a number of parameters such as compositions of the bimetallic systems, their preparation method, and their morphostructure. In this regard, numerous efforts have been made to develop “designer” bimetallic catalysts with specific nanostructures and surface properties as a result of recent advances in the area of materials chemistry. The present review highlights a detailed overview of the development of nickel-based bimetallic catalysts for energy and environmental applications. Starting from a materials science perspective in order to obtain controlled morphologies and surface properties, with a focus on the fundamental understanding of these bimetallic systems to make a correlation with their catalytic behaviors, a detailed account is provided on the utilization of these systems in the catalytic reactions related to energy production and environmental remediation. We include the entire library of nickel-based bimetallic catalysts for both chemical and electrochemical processes such as catalytic reforming, dehydrogenation, hydrogenation, electrocatalysis and many other reactions

Chemistry of thiocarboxylates: Synthesis and structures of neutral silver(I) thiocarboxylates with triphenylphosphine †

10.1039/b007122fJournal of the Chemical Society, Dalton Transactions3329-33

Synthesis and structure of [(Ph3P)2Ag(μ-Cl)(μ-SC{O}Ph)In(SC{O}Ph) 2]

10.1016/S0020-1693(02)00908-8Inorganica Chimica Acta336111-114ICHA

trans-Bis(thioacetato-S)bis(triphenylphosphine-P)nickel(II)

10.1107/S0108270100004893Acta Crystallographica, Section C: Crystal Structure Communications567775-776ACSC

Synthesis, structures and31P NMR studies of bis(diphenylphosphino)-methane adducts of copper and silver thiocarboxylates †

10.1039/b007867kJournal of the Chemical Society, Dalton Transactions3322-32