A5050621167- Metal and Thin Film Mechanics
- Advanced materials and composites
- Intermetallics and Advanced Alloy Properties
- Microstructure and mechanical properties
- High Entropy Alloys Studies
- Electrocatalysts for Energy Conversion
- Iron oxide chemistry and applications
- Copper Interconnects and Reliability
- Fluid Dynamics and Thin Films
- Advanced battery technologies research
- Additive Manufacturing Materials and Processes
- Solidification and crystal growth phenomena
- Diamond and Carbon-based Materials Research
- Magnesium Alloys: Properties and Applications
- CO2 Reduction Techniques and Catalysts
- Fuel Cells and Related Materials
- Surface and Thin Film Phenomena
- Advanced Photocatalysis Techniques
- Metal Extraction and Bioleaching
- Advanced Materials Characterization Techniques
- Mine drainage and remediation techniques
- Aluminum Alloy Microstructure Properties
- High-Temperature Coating Behaviors
- Metal Alloys Wear and Properties
- Chalcogenide Semiconductor Thin Films
Max-Planck-Institut für Nachhaltige Materialien
2014-2024
Max Planck Society
2015-2021
High oxygen evolution reaction activity of ruthenium and long term stability iridium in acidic electrolytes make their mixed oxides attractive candidates for utilization as anodes water electrolyzers. Indeed, such materials were addressed numerous previous studies. The application a scanning flow cell connected to an inductively coupled plasma mass spectrometer allowed us now examine the toward parallel. whole composition range Ir–Ru mixtures has been covered thin film material library. In...
Abstract The beneficial effects of Sn(IV) as a dopant in ultrathin hematite (α‐Fe 2 O 3 ) photoanodes for water oxidation are examined. Different Sn concentration profiles prepared by alternating atomic layer deposition Fe and SnO x . Combined data from spectrophotometry intensity‐modulated photocurrent spectroscopy yields the individual process efficiencies light harvesting, charge separation, transfer. best performing Sn‐doped both on surface subsurface region benefit enhanced separation...
Solid state dewetting can be used for targeted patterning, but also causes degradation or failure of thin film devices. In this work the temperature-induced changes a tetracrystalline model system with inhibited surface diffusion are studied. This is accomplished by growing Al films molecular beam epitaxy on single crystalline (0001) oriented sapphire substrates. The as-deposited form two orientation relationships (OR I and OR II) both subdivided in twin-related growth variants leading to...
Nano-structured copper thin films present numerous applications for miniaturization of electronic devices. Their long term stability is key reliable functionality. This work explores the thermal and solid state dewetting a Cu-Co solution film compares it to pure Cu. As according phase diagram Co practically immiscible in Cu at room temperature, metastable Cu-15 at. % was deposited as on sapphire wafer. The microstructural evolution super-saturated temperatures ranging from 673 1073 K...
Cementite (Fe3C) plays a major role in the tribological performance of rail and bearing steels. Nonetheless, current understanding its deformation behavior during wear is limited because it conventionally embedded matrix. Here, we investigate chemical evolution bulk polycrystalline cementite single-pass sliding at contact pressure 31 GPa reciprocating multi-pass 3.3 GPa. The was studied by electron backscatter diffraction for slip trace analysis transmission microscopy. Our results...
The development of sputtered coatings with improved hardness-toughness property combination is widely sought after. Multi-element ceramic carbide (Hf-Nb-Ta-Zr)C excess carbon, synthesized by DC co-sputtering presented in this study as a promising candidate to achieve objective. specific roles microstructure and residual stress are decoupled order understand their influence on the mechanical properties. Extensive characterization through situ testing focused ion beam fabricated...
Excellent properties (durability, wear and corrosion resistance) long service life under extreme conditions are essential for the successful application of metallic materials in energy sector. In particular, future fusion applications, high Cr ferrous alloys (in our case Eurofer) great interest. Importantly, modified microstructure with higher dimensional stability improves resistance properties. this study, we successfully manipulate desired type microstructure, which could provide a...
In a textured Mg thin film, two types of 〈0001〉 tilt grain boundaries are identified by electron microscopy and atomistic simulation. Coincidence site lattice dislocation models applied to study in hexagonal close-packed crystals.
3D hierarchical Nb3O7(OH) mesocrystals can be formed by self-organization from nanometer sized building blocks. The present study focuses on the synthesis and detailed investigation of mesocrystals, which achieved a one-step, template-free hydrothermal approach. obtained cubic superstructures consist periodic nanowire-network combine large surface area, high crystallinity, with band gap 3.2 eV photocatalytic activity. Their easy processability in combination named excellent properties makes...
Abstract Hematite-based photoanodes have been intensively studied for photoelectrochemical water oxidation. The n -type dopant Sn has shown to benefit the activity of hematite anodes. We demonstrate in this study that Sn-doped thin films grown by atomic layer deposition can achieve uniform doping across film thickness up at least 32 mol%, far exceeding equilibrium solubility limit less than 1 mol%. On other hand, with introduction doping, crystallite size decreases and many twin boundaries...
Face‐centered cubic (fcc) metals deposited onto crystalline substrates grow heteroepitaxially with specific orientation relationships (ORs). The ORs depend on a number of factors including lattice mismatch, bonding and the relative symmetry between surface film. Less explored include defects like growth annealing twins. In this study, high density nanotwins in as‐deposited films delay grain OR1 (, ) grains up to 0.56 T m . A new OR respect c‐sapphire substrate is found, compared well‐known...
This work demonstrates that the solvothermal synthesis of nanocrystalline CuInS2 thin films using amino acid l-cysteine as sulfur source is facile and robust against variation reaction time temperature. Synthesis was carried out in a range 3–48 h (at 150 °C) temperature 100–190 °C (for 18 h). It found at least 6 140 needed to produce pure proven by X-ray electron diffraction, high-resolution transmission microscopy, energy-dispersive spectroscopy. Using UV-vis spectroscopy, good absorption...
Photoelectrical water oxidation by photoanodes comprised of ultrathin hematite films is investigated Christina Scheu, Rossitza Pentcheva, and co-workers in article number 1804472. It determined that on-surface tin doping prevents hole-trapping lowers the overpotential. Sub-surface doping, provided bulk remains undoped, introduces a band gradient, thereby enhancing charge separation efficiency. The results will be useful developing high-performance splitting systems.
Using CO 2 and converting it into useful products or even fuels is considered as a “dream reaction”. However after over 30 years of research in the field electrochemical reduction “dream” didn’t come true still remains scientific technical challenge. Two main applications can be for reduction: (1) The operation storage technology to compensate unavoidable energy fluctuations produced by renewable source like wind sun (2) syntheses valuable ethylene. Whilst gas-phase heterogeneous catalysis...
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