A5088691609- X-ray Diffraction in Crystallography
- Crystallization and Solubility Studies
- Electrocatalysts for Energy Conversion
- Crystallography and molecular interactions
- Advanced battery technologies research
- Advanced Photocatalysis Techniques
- Catalytic Processes in Materials Science
- Supercapacitor Materials and Fabrication
- Advancements in Battery Materials
- Conducting polymers and applications
- Electrochemical Analysis and Applications
- Fuel Cells and Related Materials
- Gas Sensing Nanomaterials and Sensors
- Copper-based nanomaterials and applications
- Advanced Battery Materials and Technologies
- Electrochemical sensors and biosensors
- Molecular Junctions and Nanostructures
- Gold and Silver Nanoparticles Synthesis and Applications
- Nanomaterials for catalytic reactions
- RNA Research and Splicing
- Mesoporous Materials and Catalysis
- Electronic and Structural Properties of Oxides
- Circular RNAs in diseases
- Kruppel-like factors research
- Semiconductor materials and devices
University of Freiburg
2016-2025
IBM Research - Zurich
2023-2024
Imperial College London
2023-2024
University Hospital of Bern
2024
University of Bern
2024
University Hospital of Basel
2024
Czech Academy of Sciences, Institute of Analytical Chemistry
2023
Carnegie Mellon University
2023
University of Wuppertal
2023
Innovation Cluster (Canada)
2022
Graphitic carbon nitride, g-C3N4, can be made by polymerization of cyanamide, dicyandiamide or melamine. Depending on reaction conditions, different materials with degrees condensation, properties and reactivities are obtained. The firstly formed polymeric C3N4 structure, melon, pendant amino groups, is a highly ordered polymer. Further leads to more condensed less defective species, based tri-s-triazine (C6N7) units as elementary building blocks. High resolution transmission electron...
In the footsteps of Liebig and Berzelius: A material first synthesized in 1834, carbon nitride (C3N4), was a graphitic mesoporous form by using silica nanoparticles as templates. The resulting electron-rich solid is an active catalyst for Friedel–Crafts acylation benzene with hexanoyl chloride. Presumably catalysis arises from shift electron density MOs to unoccupied orbitals (see picture). Supporting information this article available on WWW under...
In the sustainable production of non-fossil fuels, water oxidation is pivotal. Development efficient catalysts based on manganese desirable because this element earth-abundant, inexpensive, and largely non-toxic. We report an electrodeposited Mn oxide (MnCat) that catalyzes electrochemical at neutral pH rates approach level needed for direct coupling to photoactive materials. By choice voltage protocol we could switch between electrodeposition inactive oxides (deposition constant anodic...
Photoactive, condensed carbon nitride nanorods (CNRs) can be obtained via confined thermal condensation of cyanamide inside the nanochannels an anodic alumni oxide (AAO) membrane template. The promotion a more network CNRs with lowered HOMO in water splitting (including both H2 and O2 revolution) photocurrent output was demonstrated.
The formation mechanisms of silver nanoparticles using aqueous perchlorate solutions as precursors and sodium borohydride reducing agent were investigated based on time-resolved in situ experiments. This contribution addresses two important issues colloidal science: (i) differences analogies between growth processes different metals such gold (ii) the influence a steric stabilizing process. results reveal that due to coalescence is fundamental principle if monomer-supplying chemical reaction...
Abstract Water oxidation in the neutral pH regime catalyzed by amorphous transition‐metal oxides is of high interest energy science. Crucial determinants electrocatalytic activity were investigated for a cobalt‐based oxide film electrodeposited at various thicknesses on inert electrodes. For water low current densities, turnover frequency (TOF) per cobalt ion bulk material stayed fully constant variation thickness factor 100 (from about 15 nm to 1.5 μm). Thickness changed neither...
Abstract Platinum is one of the best‐performing catalysts for hydrogen evolution reaction (HER). However, high cost and scarcity severely hinder large‐scale application Pt electrocatalysts. Constructing highly dispersed ultrasmall entities thereby a very effective strategy to increase utilization mass activities, reduce costs. Herein, composed mixture single atoms, clusters, nanoparticles are synthesized on mesoporous N‐doped carbon nanospheres. The presence demonstrated by combining among...
An aluminium battery using an organic redox polymer as a positive electrode material delivers high reversible specific capacities at fast C-rates.
The use of mesoporous graphitic C3N4 for the activation benzene permitted to perform more sustainable Friedel-Crafts reactions by allowing directly carboxylic acids, alcohols and even quaternary ammoniums or urea as electrophiles.
Supported cobalt oxide nanoparticles (NPs) have been prepared by wetness impregnation on different supports and subsequent heat treatment in argon at 350 °C for 2 h. The thus (Co3O4) can be well dispersed carbonaceous materials such as activated carbon (AC) covalent trizaine frameworks (CTF), with average particle sizes below 5 nm. catalytic performance of supported Co3O4 NPs was tested aerobic oxidation alcohols liquid phase. results show that AC NPs, Co3O4/AC, exhibit ∼100% conversions...
Abstract For the production of nonfossil fuels, water oxidation by inexpensive cobalt‐based catalysts is high interest. Films for electrocatalysis were obtained oxidative self‐assembly (electrodeposition) from aqueous solutions containing, apart Co, either K, Li or Ca with a phosphate, acetate chloride anion. X‐ray absorption spectroscopy (XAS) at Co K ‐edge revealed clusters edge‐sharing CoO 6 octahedra in all films, but size structural disorder Co‐oxido differed. Whereas potassium binding...
Metal nitride nanoparticles are synthesized using mesoporous carbon nitride, first as a nanoconfinement matrix and then nitrogen source. The reaction-confining is thermally decomposed during synthesis, thus becoming source of donation, removing the need for further purification isolation steps. Using this approach, direct copies silica nanostructures generated in metal form (see figure). Supporting information article available on WWW under...
Mesoporous graphitic carbon nitride was used as both a nanoreactor and reactant for the synthesis of ternary metal nanoparticles. By infiltration mixture two precursors into mesoporous nitride, pores act first nanoconfinement, generating amorphous mixed oxide During heating decomposition, second acts or, more precisely, nitrogen source, which converts preformed nanoparticles corresponding (reactive templating). Using this approach, particles with diameters smaller 10 nm composed aluminum...
A generalized synthesis of high-quality, mesoporous zeolite (e.g., MFI-type) nanocrystals is presented, based on a biomass-derived, monolithic N-doped carbonaceous template. As an example, ZSM-5 single crystals with desirable large-diameter (12-16 nm) intracrystalline mesopores are synthesized. The platform provides scope to optimize template dimensions and chemistry for the range micro-/mesoporous crystalline zeolites in cost-effective highly flexible manner.
Abstract Composites of mesoporous polymeric carbon nitride and tungsten(VI) oxide show very high photocatalytic activity for the evolution hydrogen from water under visible light in presence sacrificial electron donors. Already addition small amounts WO 3 yields up to a twofold increase efficiency when compared bulk nitrides their composites more notably even best reported nitride‐based materials. The higher can be attributed surface area synergetic effect resulting improved charge...
Whether infarct size modifies the treatment effect of early vs late direct oral anticoagulant (DOAC) initiation in people with ischemic stroke and atrial fibrillation is unknown.
Katalyse ohne Metall: Graphitische mesoporöse Kohlenstoffnitride (C3N4) wurden mithilfe von Silica-Nanopartikeln als harten Templaten synthetisiert. Die elektronenreichen Materialien sind aktive Katalysatoren in der Friedel-Crafts-Acylierung Benzol mit Hexanoylchlorid. Vermutet wird, dass die auf einer Elektronendichteverschiebung den Molekülorbitalen des Katalysators nichtbesetzten Orbitale Benzols beruht (siehe Bild). Hintergrundinformationen zu diesem Beitrag im WWW unter...
Abstract The synthesis and properties of a series new structure‐directing triblock copolymers with PEO‐PB‐PEO structure (PEO = poly(ethylene oxide) PB polybutadiene) their application as superior pore‐templates for the preparation mesoporous titania coatings are reported. Starting from either TiCl 4 or preformed TiO 2 nanocrystalline building blocks, crystalline titanium oxide films significant degree mesoscopic ordered pores derived, pore size can be controlled by molecular mass template...
Facile sol–gel synthesis of Mo:BiVO<sub>4</sub> thin films with optimized morphology results in reduced surface recombination and enhanced hole transfer efficiency.
The hysteresis in the CO oxidation profile over Pt/Al2O3 catalysts has been intensively studied, but its origin is still controversial. In this work, influence of Pt particle size and distribution was systematically investigated. By application conventional advanced preparation methods, such as flame spray pyrolysis supercritical fluid reactive deposition, a series containing homogeneous distributions particles were obtained. An optimal 2–3 nm identified for light-off on catalysts. results...
Magnetic hybrid assemblies of Ag and Fe3O4 nanoparticles with biocompatibly immobilized myoglobin (Mb) were designed to detect capture toxic targets (NO2–, CN–, H2O2). Mb was covalently attached chitosan-coated magnetic silver (M-Ag-C) via glutaraldehyde that serves as a linker for the amine groups chitosan. As verified by surface-enhanced resonance Raman (SERR) spectroscopy, this immobilization strategy preserves native structure bound well binding affinity small molecules. On basis...
Abstract In regard to earth‐abundant cobalt water oxidation catalysts, very recent findings show the reorganization of materials amorphous active phases under catalytic conditions. To further understand this concept, a unique cobalt‐substituted crystalline zinc oxide (Co:ZnO) precatalyst has been synthesized by low‐temperature solvolysis molecular heterobimetallic Co 4− x Zn O 4 ( =1–3) precursors in benzylamine. Its electrophoretic deposition onto fluorinated tin electrodes leads after...
Anion substitution is an emerging strategy to enhance the photoelectrochemical performance of metal oxide photoelectrodes. In present work, we investigate effect fluorine incorporation on water oxidation BiVO4 and Mo:BiVO4 thin film photoanodes. The photoanodes were prepared by a straightforward organometallic solution route involving dip coating subsequent calcination in air. Fluorine modification was realized applying soft low-cost solid–vapor reaction fluorine-containing polymers inert...