A5033871115- Fuel Cells and Related Materials
- Advanced X-ray Imaging Techniques
- Hybrid Renewable Energy Systems
- Electron and X-Ray Spectroscopy Techniques
- X-ray Spectroscopy and Fluorescence Analysis
- X-ray Diffraction in Crystallography
- Advanced Battery Technologies Research
- Advancements in Solid Oxide Fuel Cells
- Electrocatalysts for Energy Conversion
- Enzyme Structure and Function
- Ga2O3 and related materials
- Vacuum and Plasma Arcs
- Ion-surface interactions and analysis
- GaN-based semiconductor devices and materials
- Microstructure and mechanical properties
- Semiconductor materials and devices
- Photocathodes and Microchannel Plates
- Semiconductor Quantum Structures and Devices
- Nuclear Physics and Applications
- Crystallography and Radiation Phenomena
- Scientific Measurement and Uncertainty Evaluation
- Electronic and Structural Properties of Oxides
- Cultural Heritage Materials Analysis
- Building materials and conservation
- Electrohydrodynamics and Fluid Dynamics
Paul Scherrer Institute
2019-2023
Philips (United Kingdom)
2013
Nordic Laboratory for Luminescence Dating
1997-1999
Universität Hamburg
1991-1996
Philips (United States)
1969-1974
Philips (Finland)
1970-1973
Philips (Germany)
1960-1969
Zentrallaboratorium Deutscher Apotheker
1960
The large penetration power of high-energy X-rays (>60 keV) raises interesting prospects for new types structural characterizations polycrystalline materials. It becomes possible in a non-destructive manner to perform local studies, within the bulk material, fundamental materials physics properties: grain orientations, strain, dislocation densities etc. In favourable cases these properties may be mapped three dimensions with spatial resolution that matches individual grains. Imbedded volumes...
We present a study of liquid water fed polymer electrolyte electrolyzer (PEWE) at cell temperatures up to 120 °C using thin membranes 50 µm thickness. Further, we show that under these conditions conversion efficiency increases by 14% 3 A cm−2 in comparison today's state the art (60 °C, 180 μm membrane). Alternatively, an increase current density factor 75% is possible. detailed voltage loss analysis provided helps understand which extent overpotential contributions are reduced. From...
The cost of polymer electrolyte water electrolysis (PEWE) is dominated by the price electricity used to power splitting reaction. We present a liquid fed electrolyzer cell operated at temperature 100 °C in comparison state-of-the-art operation 60 over 300 h constant current period. hydrogen conversion efficiency increases up 5% elevated and makes green cheaper. However, stress factor that accelerates degradation causes cell. PEWE shows 5 times increased voltage loss rate compared °C. initial...
Novel focusing optical devices have been developed for synchrotron radiation in the energy range 40-100 keV. Firstly, a narrow-band-pass energy-tuneable fixed-exit monochromator was constructed by combining meridionally bent Laue and Bragg crystals. Dispersion compensation applied to retain high momentum resolution despite beam divergence caused focusing. Next, microfocusing achieved multilayer arranged behind crystal alternatively crystal. A 1.2 micro m-high line focus obtained at 90 The...
Hydrogen gas crossover is a major safety issue in polymer electrolyte water electrolyzers (PEWE) and limiting factor for the use of thinner membranes high voltage efficiency PEWE. This article outlines simple impregnation method recombination catalyst, yielding suppression at differential pressures without negative effects on cell performance.
Adsorbed films of CsF covered with a monolayer Cs on GaAs reduce the work function to value 1 eV. The advantages such layer compared or Cs, O are increased thermal stability and possibility reducing p-type doping and/or band gap semiconductor, by using mixed crystals InAs. Fermi level position is less than 0.4 eV above valence edge at surface. For CsF, optimum escape probability 0.5 for UHV cleaved in range between 1.3 × 1018 5.1 1019 cm−3. Ga0.85In0.15As threshold photoemission was reduced...
A key concern for the safe operation of polymer electrolyte water electrolysis (PEWE) cells is high hydrogen gas crossover that can lead to explosive hydrogen-oxygen mixtures. The safety aspect especially important with thin membranes, differential pressures and low current densities. Pt particles incorporated into membrane catalyze recombination H2 O2 lower content in oxygen product stream. So far, different approaches have been taken distribution over membrane's cross-section suppress...
Understanding the deactivation mechanisms affecting state-of-the-art, Ir oxide catalysts employed in polymer electrolyte water electrolyser (PEWE-) anodes is of utmost importance to guide catalyst design and improve PEWE-durability. With this motivation, we have tried decouple contributions various degradation overall performance losses observed rotating disk electrode (RDE) tests on three different, commercial (pure or supported Nb 2 O 5 ). Specifically, investigated whether these decays...
The introduction of synchrotron beamlines for high-energy X-ray diffraction raises new possibilities texture determination polycrystalline materials. local can be mapped out in three dimensions and developments studied situ complicated environments. However, it is found that a full alignment the two-dimensional detector used many cases impractical data-sets are often partially subject to geometric restrictions. Estimating parameters traces Debye–Scherrer cones on therefore becomes concern....