منابع مشابه
An XPS study of platinum nanoparticles prepared by a low-pressure flat flame
The one-step synthesis and characterization of nanostructured metallic platinum microspheres by a low-pressure flat flame technique is presented here. Field emission scanning electron microscopy (FESEM), X-ray diffraction (XRD) and X-ray Photoelectron Spectroscopy (XPS) analyzed the as-derived powders. Collectively, the results obtained from these analyses confirmed the formation of microsphere...
متن کاملCyclic voltammetry and XPS studies of monolayers deposited on gold and platinum electrodes displaced by mercaptopyridines
We present studies, by cyclic voltannnetry and X-ray photoelectron specu'oscopy (XPS), of the under and oveq~otenfial deposition of copper on polycrystalline platinum and gold electrodes in aqueous 0.50 M sulfuric acid solution in the presence and absence of ads(~r~d layers of 2and 4-mereaptopyridine (2-MP, 4°MP). in general we find that the presence of adsorbed htyers of either 2-MP {~r 4-MP g...
متن کاملUnderstanding nanoparticle porosity via nanoimpacts and XPS: electro-oxidation of platinum nanoparticle aggregates.
The porosity of platinum nanoparticle aggregates (PtNPs) is investigated electrochemically via particle-electrode impacts and by XPS. The mean charge per oxidative transient is measured from nanoimpacts; XPS shows the formation of PtO and PtO2 in relative amounts defined by the electrode potential and an average oxidation state is deduced as a function of potential. The number of platinum atoms...
متن کاملXPS MultiQuant: multimodel XPS quantification software
A program for quantitative evaluation of x-ray photoelectron spectra has been developed to serve as a practical tool for surface chemists. The program uses the ‘classic’ approach of quantification and requires as input the integrated intensities of the measured XPS lines. The usual correction methods and factors can be applied and controlled independently. All necessary basic data for calculati...
متن کاملPlatinum Extraction Modeling from Used Catalyst by Iodine Solutions
Platinum extraction from spent reforming catalysts in iodine solutions under atmospheric pressure at different temperatures, acid concentration, and iodine spices concentration, catalyst particle size, and impeller agitation speed have been studied in our group. In this system, platinum is oxidized from spent catalyst with I3¯ that is formed ...
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ژورنال
عنوان ژورنال: Surface Science Spectra
سال: 1996
ISSN: 1055-5269,1520-8575
DOI: 10.1116/1.1247817