A5085616241- Machine Learning in Materials Science
- Electrocatalysts for Energy Conversion
- X-ray Diffraction in Crystallography
- Catalytic Processes in Materials Science
- Electron and X-Ray Spectroscopy Techniques
- Laser-Ablation Synthesis of Nanoparticles
- Gold and Silver Nanoparticles Synthesis and Applications
- nanoparticles nucleation surface interactions
- Glass properties and applications
- Nonlinear Optical Materials Studies
- Electrochemical Analysis and Applications
- X-ray Spectroscopy and Fluorescence Analysis
- Carbon Nanotubes in Composites
- Thermal and Kinetic Analysis
- Advanced Chemical Physics Studies
- Laser Material Processing Techniques
- Graphene research and applications
- Advanced Materials Characterization Techniques
- Zeolite Catalysis and Synthesis
- Nuclear Physics and Applications
- Photonic Crystals and Applications
- Advanced battery technologies research
- Advancements in Battery Materials
- Ferroelectric and Piezoelectric Materials
- Plasmonic and Surface Plasmon Research
Southern Federal University
2015-2024
Institut für Nanophotonik
2016
Hydride formation in palladium nanoparticles was studied by Pd K-edge X-ray absorption spectroscopy both the near-edge (XANES) and extended (EXAFS) regions diffraction (XRD) situ as a function of temperature hydrogen pressure. In contrast to EXAFS XRD, which probe Pd–Pd interatomic distance changes, direct effect concentration on electronic structure is observed intensities peak positions XANES region. By using theoretical simulations, we propose simple analysis based changes relative...
Nanocatalysts PtAg/C with different distributions of components in bimetallic PtAg nanoparticles were synthesized by the methods simultaneous and sequential reduction Ag+ Pt(IV) carbon suspension, prepared on basis ethylene glycol–water solvent. The characterization atomic structure as obtained after acid treatment at 90 °C was performed Pt L3-edge extended X-ray absorption fine (EXAFS) using technique for determining local parameters absorbing atoms, which have nearest surrounding...
In the current work we present a detailed analysis of hydride phase formation in industrial Pd/C nanocatalysts by means combined situ X-ray absorption spectroscopy (EXAFS), diffraction (XRD) and volumetric measurements for temperatures from - 10 to 50 °C hydrogen pressure range 0 1000 mbar. α- β- phases are clearly distinguished XRD. For first time, H/Pd atomic ratio were obtained theoretical fitting near-edge region spectra (XANES) compared with measurements.
The effects of hydrogen in Pd nanoparticles on the features K-edge X-ray absorption near edge structure (XANES) are studied. Simulations indicate a linear dependence intensities XANES maxima upon concentration bulk clusters at low H-concentrations and stepwise increase first peak high concentrations. diffusion H atoms over interstitial sites considered. application obtained results to experimental spectra measured PdH sizes from 1.3nm 10.5nm indicates mobility H-atoms nanoparticles.
Supported PtCu/C electrocatalysts containing core–shell bimetallic PtCu nanoparticles were synthesized by sequential chemical reduction of Cu2+ and Pt(IV) in a carbon suspension, prepared on the basis ethylene glycol–water solvent, then treated at different temperatures range from 250 to 350 °C. The structural characterization "as-prepared" those obtained after thermal treatments was performed transmission electron microscopy, X-ray diffraction, Pt L3- Cu K-edge extended absorption fine...
Applicability of the existing criteria for signal frequencies resolution to problem close interatomic distances determination by energy-restricted x-ray absorption spectra is studied within approach based on Fourier transformation and fitting procedures. Without losing generality, theoretical signals $\ensuremath{\chi}(k)$ different $k$ dependencies are used among them---the spectroscopy ($k$ photoelectron's wave number). The last ones calculated at values two ${R}_{1}$ ${R}_{2}$ in a model...
The electronic structure of the filled and unfilled states formation chemical bonding in PtO2, PtCl4, PtS2, Au2S are studied by measured Pt Au Lβ5 X-ray emission spectra (XES) L3-edge absorption (XAS). study is based on comparative analysis calculated local partial densities (LPDOS) noble atom neighboring ligands. It revealed that theoretical description experimental requires going beyond MT-approximation therefore full-potential linearized augmented-plane-wave method realized code WIEN2k...