نتایج جستجو برای: essentially metallic oxides
تعداد نتایج: 118145 فیلتر نتایج به سال:
Functionalization of transition metal oxides using metallic nanoparticles is an interesting route towards efficient photoelectrochemical hydrogen production via water splitting. Although an enhanced photocurrent in photoanodes upon functionalization with metallic nanostructures has been observed in several studies, to the best of our knowledge no measurements of the Faradaic efficiency (FE) of ...
A polycrystalline sample of Pb2NiOsO6 was synthesized under high-pressure (6 GPa) and high-temperature (1575 K) conditions. crystallizes in a monoclinic double perovskite structure with centrosymmetric space group P21/n at room temperature. is metallic down to 2 K shows single antiferromagnetic (AFM) transition TN = 58 K. new example AFM oxide three-dimensional connectivity. Neutron powder diff...
Metallic porous microtubes were obtained from commercial wires (200–250 μm diameter) of Cu-65Ni-2Fe, Cu-44Ni-1Mn and Cu-23Ni, alloys (wt. %) by surface oxidation at 1173 K in air, removal of the unoxidized core by chemical etching, and reduction in annealing in the hydrogen atmosphere. Transversal sections of the partially oxidized wires show a porous layered structure, with an external shell o...
CO oxidation on Pd(100), -(111), -(110), and Pt(110) single crystals was studied at steady-state conditions at low (e2 × 10-3 Torr) and high (2-88 Torr) pressures at various reactant compositions. At low pressures the reaction fell into two regimes, one with a CO-dominant surface where the CO2 formation rate is low, and a second with an O-dominant surface where the reaction rate is high. Within...
The optical and infrared properties of films of vanadium dioxide VO2 and vanadium sesquioxide V2O3 have been investigated via ellipsometry and near-normal incidence reflectance measurements from far infrared to ultraviolet frequencies. Significant changes occur in the optical conductivity of both VO2 and V2O3 across the metal-insulator transitions at least up to and possibly beyond 6 eV. We arg...
The electrochemical properties of graphene are highly sensitive to residual metallic impurities that persist despite various purification efforts. To accurately evaluate the electrochemical performance of graphene, highly purified materials free of metallic impurities are required. In this study, the partial purification of chemically reduced graphene oxides prepared via Hummers (CRGO-HU) and S...
DETERMINATION OF SILICA OXIDE iron ores usually are found in intimate association with sllica and phosphorus compounds. heir quantitative separation and purification sometimes present difficult problems to the chemist. Silicic acids may represent various degrees of dehydration. They are exceedingly weak, but combine with metallic oxides and form some of the most stable , oxides in nature, the s...
This work aims to clarify the nano-structural transformation accompanying the loss of activity and selectivity for H2O2 synthesis of Pd and AuPd nanoparticles supported on N-functionalized carbon nanotubes (NCNTs). High resolution XPS allowed discriminating metallic Pd, electronically-modified metallic Pd hosting impurities and cationic Pd. This is paralleled by morphological heterogeneity obse...
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