Carbon nanofiber (CNF)-supported platinum catalysts have been prepared using Pt(NH3)4(NO3)2 as precursor by two different ion exchange techniques, one at a constant pH and one in which the pH is gradually and homogeneously increased from 3 to 6 by hydrolysis of urea. The latter method resembles the procedure of homogeneous deposition precipitation (HDP). Characterization of the CNF support was ...

Historically, platinum has played a prominent role in organometallic chemistry. The compounds KPtCI,(C,H,)H,O (I), PtMe, (X) (2) and Chugaev's salt [PtC,H,,N,],Clx (3, 4) present some of the fist examples of stable metal-olefin, metal-alkyl and metalcarbene complexes, although ironically the nature of the bonding in these compounds was not immediately recognised. In the study of organometallic ...

We propose a new design for electrocatalysts consisting of two (platinum and iron oxide) that are deposited on the surfaces an oxidized graphene substrate. This is based simple structure where catalysts were separately both sides substrate; while oxide precipitated out etching solution bottom-side, surface substrate was decorated with platinum using atomic layer deposition technique. The Fe2O3-...

Regional assessments are critical to evaluate resources at risk from disturbances, such as acidic deposition, which occur in large spatial extent. It is imperative to accurately quantify atmospheric deposition to the regions like the Adirondack Mountains of New York where soils and surface waters are highly sensitive to inputs of strong acids. Spatial patterns in precipitation quantity and conc...

Glassy carbon electrodes were coated with the film poly-(p-allyl ether benzenesulfonic acid) by an anodic procedure. Nickel, platinum, and palladium ions were introduced into the film by ion exchange of H(+) with the corresponding salts. These ions were catalytically reduced to their corresponding metals using the known electroless reducing agent sodium hypophosphite. Scanning electron microcop...

A period (08:10–14:40 MLT, 11 February 1997) of enhanced electron density in the Dand E-regions is investigated using EISCAT, IRIS and other complementary instruments. The precipitation is determined to be due to substorm processes occurring close to magnetic midnight. Energetic electrons drift eastward after substorm injection and precipitate in the morning sector. The precipitation is trigger...

Halonium ions, in which formally positively charged halogens (chlorine, bromine, and iodine) are equivalently attached to two carbon atoms through three-center bonds, are well established in the synthetic chemistry of organochlorides, bromides, and iodides. Mechanistic studies of these ions have generated numerous insights into the origins of stereoselectivity in addition and displacement react...

Single crystals of one mole % Mn doped CuGaS2 (CGS) compound semiconductor were grown by a chemical vapor transport (CVT) technique in a closed system using iodine as a transporting agent. The electron paramagnetic resonance (EPR) of the Mn ions in a CGS single crystal has been studied with an X-band spectrometer recorded at 80 K. The spectroscopic splitting tensor (g), hyperfine constant (A) a...

Graphene nanoplatelets (GNPs), synthesized using potassium permanganate-based oxidation and exfoliation followed by reduction with hydroiodic acid (rGNP-HI), have intercalated manganese ions within the graphene sheets, and upon functionalization with iodine, show excellent potential as biomodal contrast agents for magnetic resonance imaging (MRI) and computed tomography (CT). Structural charact...

Poly(3,4-ethylenedioxythiophene) (PEDOT) films doped with nitric and chlorine ions have been electrochemically deposited simply by a one-step electrochemical method in an aqueous media in the absence of any surfactant. The fabricated PEDOT films were characterized by scanning electron microscopy, transmission electron microscopy, and Raman spectroscopy. The results indicate that the hierarchica...