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Showing 1 to 13 of 13 for “"X-ray absorption fine structure (XAFS)"”.
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Understanding the origin of the recovery of superconductivity in halogenated YBCO single crystal : atomic structure study
… this problem, we have performed multiple-edge x-ray absorption fine structure (XAFS) measurements about the Y K, Ba L_3, I L_3, Cu K and Br K-edges at room temperature on brominated (non-brominated) and iodinated (non-iodinated) YBCO single crystals. Our XAFS results at the Br K (brominated) and …
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Reactivity and Structure of Supported Nickel Phosphides (Ni₂P) in Deep Hydrodesulfurization Catalysis
… catalysts with a wide range of techniques: X-ray powder diffraction (XRD), transmission electron microscopy (TEM), Fourier transform infrared (FTIR) and X-ray absorption fine structure (XAFS) spectroscopy. The use of these techniques allowed better understanding of the nature of the active …
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Operando Characterization of Lithium-Ion Batteries using Lab-Scale X-ray Emission/Absorption Spectroscopy
Tracking changes in the electronic structure of target elements is crucial to investigate the nature of redox reactions occurring in battery electrodes. Core-hole characterization techniques such as X-ray Emission Spectroscopy (XES) and X-ray Absorption Fine Structure (XAFS) perform this role well …
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Diluted Magnetic Semiconductor Cobalt and Europium Implanted ZnO Thin Film
… or caused by the Co metallic clusters. The X-ray magnetic circular dichroism (XMCD) shows that the strong spin polarization of localized Eu atoms observed near surface of the Zn1-xEuxO thin films. The XMCD results also suggest Eu implanting to ZnO:Co system has suppressed Co metallic …
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An Investigation into Selenium Geochemistry in Phosphate Mine Soils
… were then evaluated using synchrotron-sourced X-ray absorption fine structure (XAFS) spectroscopy for both whole and a sequence of extracted soils. Lastly, competitive adsorption of Se with two dissolved organic carbon (DOC) species, citric and salicylic acid, was examined on an amorphous iron …
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Geochemical Conditions Affecting Uranium(VI) Fate And Transport In Soil And Groundwater In The Presence Of Phosphate
… ternary surface complex. Second, molecular-scale structures of adsorbed and precipitated U(VI) from batch experiments were probed using X-ray absorption fine-structure: XAFS) spectroscopy for different total U(VI) concentrations over a pH range 4-7 in the absence and presence of phosphate. The …
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High-throughput synthesis and characterization of vanadium mixed metal oxide pigments using synchroton radiation
… and characterised in terms of their crystal<br/>structure, and band gap energies using powder X-ray diffraction (PXD), synchrotron-based<br/>X-ray absorption fine structure (XAFS) spectroscopy, solid state UV-Visible and Raman<br/>spectroscopy, Scanning and Transmission electron microscopy (SEM …
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The role of additives in Fischer-Tropsch reactions
… out using characterisation methods such as X-ray Absorption Fine Structure (XAFS) spectroscopy, X-ray Photoelectron Spectroscopy (XPS), Powder X-ray Diffraction (PXRD), Scanning Electron Microscopy (SEM), Energy Dispersive X-ray (EDX) and Brunner-Emmett-Taller surface area determination (BET). …
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Reconstruction of Rhodium Clusters During CO Oxidation and Consequences on The Reaction Mechanism
… and isolated (single) atoms. Understanding structure sensitivity and identifying the active site or sites are crucially essential for designing efficient catalysts. To determine the active sites of a catalyst for a particular chemical reaction, in-situ/operando spectroscopy, such as diffuse …
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Structure Sensitivity in the Subnanometer Regime on Pt and Pd Supported Catalysts
… characterization techniques including x-ray absorption fine structure (XAFS), X-ray diffraction (XRD), X-ray photoelectron spectroscopy(XPS), diffuse reflectance infrared spectroscopy (DRIFTS), calorimetry and high-resolution scanning transmission electron microscopy (STEM) to investigate …
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Structural and Kinetic Study of Low-temperature Oxidation Reactions on Noble Metal Single Atoms and Subnanometer Clusters
… different operando techniques including x-ray absorption fine structure (XAFS), diffuse reflectance infrared spectroscopy (DRIFTS), with other characterization techniques including calorimetry and high-resolution scanning transmission electron microscopy (STEM) to investigate the active and …
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Composites of Spherical Polyelectrolyte Brushes and Nanoparticles – Synthesis, Characterization and Their Use in Catalysis
… chains of the SPBs. By a combination of powder X-ray diffraction (PXRD), transmission electron microscopy (TEM) and cryogenic TEM (cryoTEM) it was found that the platelet-like MnOxNP are of layered topology built up from MnO6 octahedra denoted as birnessite. The PXRD patterns revealed a disorder …
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Understanding and controlling the reactivity of oxygen reduction and methanol oxidation electrocatalysts
… = 3.1). Electron paramagnetic resonance (EPR), X-ray absorption fine structure (XAFS), and magnetometry measurements show the electronic structure around the Fe center is the same for all three supports. Only the Fe porphyrin supported on XC72 exhibits a pH XC72 relative to the other supports, …