A5070797978- Catalytic Processes in Materials Science
- Advanced Chemical Physics Studies
- Electrocatalysts for Energy Conversion
- Advanced battery technologies research
- Asymmetric Hydrogenation and Catalysis
- Carbon dioxide utilization in catalysis
- Electronic and Structural Properties of Oxides
- Fuel Cells and Related Materials
- nanoparticles nucleation surface interactions
- Advanced Memory and Neural Computing
- CO2 Reduction Techniques and Catalysts
- Nanomaterials for catalytic reactions
- Advanced Photocatalysis Techniques
- Covalent Organic Framework Applications
- Neuroscience and Neural Engineering
- Advancements in Solid Oxide Fuel Cells
- Advanced Materials Characterization Techniques
- Renal and Vascular Pathologies
- Catalysis and Oxidation Reactions
- Gas Sensing Nanomaterials and Sensors
- Transition Metal Oxide Nanomaterials
- Organophosphorus compounds synthesis
- Neural dynamics and brain function
- Hydrogen Storage and Materials
- Ammonia Synthesis and Nitrogen Reduction
Forschungszentrum Jülich
2016-2025
Stadtwerke Jülich (Germany)
2016-2020
Universität Ulm
2007-2015
Memorial Health University Medical Center
1968
Yale New Haven Hospital
1966
Yale University
1964-1965
Community Hospital
1965
Johannes Gutenberg University Mainz
1961-1963
Abstract Water splitting is an environmentally friendly strategy to produce hydrogen but limited by the oxygen evolution reaction (OER). Therefore, there urgent need develop highly efficient electrocatalysts. Here, NiFe layered double hydroxides (NiFe LDH) with tunable Ni/Fe composition exhibit corresponding dependent morphology, structure, and chemical states, leading higher activity better stability than that of conventional LDH‐based catalysts. The characterization data show low...
Abstract The development of novel metal oxide catalysts for electrochemical water splitting has been one the future challenges in catalysis. We present structured spinel based NiCo 2 O 4 materials using in‐situ hydrothermal synthesis and KIT‐6 as a template. Their electron transfer kinetics oxygen evolution reaction (OER) at pH 14 are studied. Structuring via improves intrinsic catalyst performance, e. g., lower overpotential ∼350 mV good long‐term stability could be observed compared to 385...
Nickel (poly)sulfides have been widely studied as anodic catalysts for alkaline water electrolysis owing to their diverse morphologies, high catalytic activities in the oxygen evolution reaction (OER), and low cost. To utilize low-cost high-efficiency polysulfides with industry-relevant cycling stability, we develop a Ni-rich NiSx/Ni(OH)2/NiOOH catalyst derived from NiS2/Ni3S4 nanocubes. shows improved OER activity (η = 374 mV@50 mA cm-2) stability (0.1% voltage increase) after 65 h of...
Abstract Formic acid is a promising hydrogen storage medium and can be produced by catalytic hydrogenation of CO 2 . Molecular ruthenium complexes immobilized on phosphine polymers have been found to exhibit excellent productivity selectivity in the under mild conditions. The polymeric analog 1,2‐bis(diphenylphosphino)ethane exhibited highest activity turnover numbers up 13 170 were obtained single run. This catalyst was already active at 40 °C with loading only 0.0006 mol %. Recycling...
The knowledge of the structural and chemical properties biochars is decisive for their application as technical products. For this reason, methods characterization that are generally applicable allow quality control highly desired. Several have shown potential in other studies were used to investigate two activated carbons seven from different processes feedstock. chars chosen cover a wide range composition hardness test analytical study. Specific problems connected with pretreatment samples...
Abstract Developing versatile and reliable memristive devices is crucial for advancing future memory computing architectures. The years of intensive research have still not reached demonstrated their full horizon capabilities, new concepts are essential successfully using the complete spectra functionalities industrial applications. Here, we introduce two-terminal ohmic memristor, characterized by a different type switching defined as filament conductivity change mechanism (FCM). operation...
The development of improved catalysts based on Co nanoparticles supported ordered mesoporous carbon CMK-3 for the highly selective hydrogenation nitroarenes is described.
Ir/terpyridine-based solid molecular catalysts facilitate efficient base-free formic acid dehydrogenation both in batch and continuous operation. A kinetic isotope effect study highlights β-hydride elimination as a rate-determining step.
Abstract Photocatalytic selective oxidation of aromatic alcohols by covalent organic frameworks (COFs) is a sustainable strategy to replace present metal‐based heterogeneous catalytic systems. Covalent triazine‐based (CTFs), subgroup COFs, possess promising properties as efficient catalysts for photocatalytic oxidation. Sulfur‐containing metal‐free CTFs exhibit good performance in photocatalysis due their narrowed band gap, and the fast generated photoelectrons/holes separation transfer....
Polymer electrolyte membrane (PEM) water electrolyzers are a key technology for driving the energy system toward renewable resource-based model. Numerous past and ongoing R&D activities have sought to reduce their dependence on precious metal catalysts, but unfortunately, there has still been no breakthrough in electrocatalyst design PEM electrolyzers. Scarce iridium remains best choice as an electrocatalyst, thanks its efficiency durability hosting oxygen evolution reaction (OER). In this...
The adsorption properties of structurally well-defined bimetallic PtAu/Pt(111) monolayer surface alloys, with known lateral distribution the respective species and varied Au contents, were studied by temperature-programmed desorption (TPD) infrared reflection–absorption spectroscopy (IRAS), using CO as probe molecule. composition atoms in alloys previously determined high-resolution scanning tunneling microscopy (STM) [Bergbreiter, A.; et al. ChemPhysChem 2010, 11, 1505], showing a tendency...
Abstract Unter bestimmten Bedingungen gelingt es, lösliche Polymere von Acrylsäureallylester, Äthylenglykol‐bis‐(N‐vinyl‐carbaminsäure)‐ester und N‐Vinylcarbaminsäureallylester zu erhalten. Es konnte gezeigt werden, daß diese Polymeren cyclisierte Grundbausteine enthalten. Die sind sehr temperaturbeständig. wird auf die Möglichkeit hingewiesen, dem Wege über Cyclopolymerisation mit 2 reaktiven Gruppen in bestimmter gegenseitiger Anordnung herzustellen.
In this work the effect of multivalency on stability NIR-absorbing HAuNSs and AuNRs functionalized by mono-, bi- tridentate polyethyleneglycol (PEG) thiol ligands is reported. Comparison commercially-available monodentate self-synthesized methoxy terminated thiol-polyethyleneglycol having molecular weights around 5000 Da shows increase for ligands, attributed to ligands. The was explored according three different aspects: (1) towards competition reactions with strong binding ligand...
Abstract Stabilization of single metal atoms is a persistent challenge in heterogeneous catalysis. Especially supported late transitions metals are prone to undergo agglomeration nanoparticles under reducing conditions. In this study, nitrogen‐rich covalent triazine frameworks (CTFs) used immobilize iridium complexes. Upon reduction at 400 °C, immobilized Ir(acac)(COD) on CTF does not form but transforms into highly active Ir atom catalyst. The resulting catalyst systems outperforms both the...
The adsorption properties of structurally well defined bimetallic Pt/Ru(0001) surfaces, consisting a Ru(0001) substrate partly or fully covered by monolayer Pt islands film, were studied temperature programmed desorption (TPD) using CO and deuterium as probe molecules. Additionally, the was investigated infrared reflection absorption spectroscopy (IRAS). presence pseudomorphic platinum film leads to considerable modifications for both adsorbates, on and, smaller extent, bare Ru part...
Low-cost, highly active, and stable catalysts are desired for the generation of hydrogen oxygen using water electrolyzers. To enhance kinetics evolution reaction in an acidic medium, it is paramount importance to redesign iridium electrocatalysts into novel structures with organized morphology high surface area. Here, we report on designing a well-defined active hollow nanoframe based iridium. The synthesis strategy was control shape nickel nanostructures which nanoparticles will grow. After...
Abstract Methyl formate was produced in one pot through the hydrogenation of CO 2 to formic acid/formate followed by an esterification step. The route offers possibility integrate renewable energy into fossil‐based chemical value chain. In this work, a phosphine‐polymer‐anchored Ru complex shown be efficient solid catalyst for direct methyl formate. 1,2‐bis(diphenylphosphino)ethane‐like polymer presented highest activity with turnover number (TON) up 3401 at 160 °C. reaction parameters were...
THE SCANNING characteristics of renal tubular adenomas have not previously been reported. It is the purpose this case report to illustrate potential value scan in diagnosis adenoma ; our knowledge represents first a “hot” tumor. Interesting angiographic are also described. Clinical Summary A 35-year-old Negro female was admitted Memorial Medical Center with four-day history gross, painless hematuria. Her past revealed that she had similar episode eighteen years previously, at which time...
Abstract Durch Umsetzung von Vinylisocyanat mit einigen L‐Aminosäureestern sowie L‐Menthol werden optisch aktive N‐Vinylverbindungen erhalten. Diese lassen sich unter verschiedenen Bedingungen (radikalisch, ionisch und durch γ‐Strahlen) polymerisieren. Die molaren Drehwerte der Monomeren Polymeren bei 589 450 mμ mitgeteilt.
Die Umsetzungen zwischen Vinylisocyanat und verschiedenen Alkoholen, Aminen Triäthylammoniumsalzen von Monoaryl-phosphorsäureestern werden beschrieben. erhaltenen N-Vinylderivate durch Angabe der Schmelz- oder Siedepunkte sowie UV-Spektren charakterisiert. meisten genannten Verbindungen sind polymerisierbar. können zu analytischen Zwecken bei Identifizierung Alkoholen verwendet werden.
Abstract Durch Addition mehrerer N ‐Vinyl‐carbamidsäureester und ‐Vinyl‐harnstoff‐Derivate an α.β‐ungesättigte Carbonylverbindungen entstehen bisher unbekannte ‐[2.3‐Dihydro‐pyranyl‐(2)]‐carbamidsäureester bzw. ‐harnstoffe. Hydrolyse erhält man Glutardialdehyd oder 4‐Acetyl‐butyraldehyd. Katalytische Hydrierung liefert die entsprechenden Tetrahydropyran‐Derivate. Die UV‐Spektren werden beschrieben.