A5103276927- Metal Extraction and Bioleaching
- Minerals Flotation and Separation Techniques
- Chalcogenide Semiconductor Thin Films
- Metallurgical Processes and Thermodynamics
- Quantum Dots Synthesis And Properties
- Copper-based nanomaterials and applications
- Semiconductor materials and interfaces
- Iron oxide chemistry and applications
- Crystal Structures and Properties
- nanoparticles nucleation surface interactions
- Extraction and Separation Processes
- Fuel Cells and Related Materials
- Inorganic Chemistry and Materials
- Mineralogy and Gemology Studies
- Electrocatalysts for Energy Conversion
- Corrosion Behavior and Inhibition
- Gas Sensing Nanomaterials and Sensors
- Analytical chemistry methods development
- 2D Materials and Applications
- Advanced Thermoelectric Materials and Devices
- Surface and Thin Film Phenomena
- Force Microscopy Techniques and Applications
- Nanowire Synthesis and Applications
- Iron and Steelmaking Processes
- Iron-based superconductors research
Spitalzentrum Centre hospitalier Biel- Bienne
2024
Fraunhofer Institute for Telecommunications, Heinrich Hertz Institute
1990-2010
German Orient Foundation
1997-2004
Institut für Solarenergieforschung
1991-2002
Technische Universität Ilmenau
1994
University of Freiburg
1983-1991
The nature of the sulfur deficit in pyrite, as found before by chemical analysis and density measurements, has been investigated powder x-ray diffraction (XRD). Structure-factor refinements showed that population parameter deviates several percent from unity, although cubic-unit-cell edge a only varies order ${10}^{\mathrm{\ensuremath{-}}3}$ \AA{}. To do these high-precision determination Cu K${\mathrm{\ensuremath{\alpha}}}_{2}$ wavelength is made. Vegard's rule for sulfur-deficient pyrite...
Polycrystalline layers of As‐doped pyrite have been produced in bromine atmosphere with the aim developing this sulfide material for solar energy applications. Its photoelectrochemical behavior contact an aqueous electrolyte was investigated. It operated as a cell and showed reasonably stable under illumination. Optical measurements performed on show that visible light is absorbed extremely thin layer 160Å spite apparently indirect gap semiconductor . This would make photosensitive...
Using the results of fully self-consistent all-electron first-principles calculations for semiconducting iron pyrite we discuss major factors governing properties as well chemical bonding this material. The are based on density functional theory within local approximation and employ augmented spherical wave method in its scalar-relativistic implementation. electronic dominated by strongly hybridized Fe $3d$ S $3p$ states. is analyzed using an ab initio implementation crystal orbital overlap...
Ultrathin (10 to 20 nm thick), polycrystalline films of (pyrite) were grown on (anatase) by chemical vapor deposition. The characterized using optical absorption and high‐resolution electron microscopy. Photoelectrochemical solar cells, coated with ultrathin films, generated high open‐circuit photovoltages, up 600 mV, compared a single crystal pyrite electrode (200 mV). photoelectrochemical behavior shows strong dependence photovoltage photocurrent the pH solution. It is explained injection...
Abstract Oxygen reduction catalysts for PEM fuel cells on the basis of carbon supported, heat‐treated iron phenanthroline complexes have been investigated with rotating disc‐electrode (RDE) measurements and thermogravimetry/mass spectrometry (TG/MS). It has found, that slope Koutecky–Levich plot from RDE changes electrode potential catalyst loading electrode. The results can be understood in terms a two times 2‐electron oxygen at iron‐based catalysts. TG/MS indicate, during heat‐treatment...