A5064393646- Catalytic Processes in Materials Science
- Advanced Electron Microscopy Techniques and Applications
- Electrocatalysts for Energy Conversion
- Electron and X-Ray Spectroscopy Techniques
- Catalysis and Oxidation Reactions
- Catalysis and Hydrodesulfurization Studies
- Electronic and Structural Properties of Oxides
- Advanced Materials Characterization Techniques
- nanoparticles nucleation surface interactions
- Machine Learning in Materials Science
- Catalysts for Methane Reforming
- Surface and Thin Film Phenomena
- 2D Materials and Applications
- Force Microscopy Techniques and Applications
- Nanomaterials for catalytic reactions
- Advanced Chemical Physics Studies
- Graphene research and applications
- Copper-based nanomaterials and applications
- Advanced Photocatalysis Techniques
- Molecular Junctions and Nanostructures
- Corrosion Behavior and Inhibition
- Nuclear Physics and Applications
- Semiconductor materials and devices
- Quantum Dots Synthesis And Properties
- MXene and MAX Phase Materials
Technical University of Denmark
2004-2024
Haldor Topsoe (Denmark)
2012-2021
Catalytic Materials (United States)
2021
Danish Geotechnical Society
2017-2020
Utrecht University
2016
Japan External Trade Organization
2014
Chalmers University of Technology
2010
Aarhus University
1999-2007
University of Copenhagen
2003
In situ transmission electron microscopy is used to obtain atom-resolved images of copper nanocrystals on different supports. These are catalysts for methanol synthesis and hydrocarbon conversion processes fuel cells. The undergo dynamic reversible shape changes in response the gaseous environment. For zinc oxide-supported samples, caused both by adsorbate-induced surface energies interfacial energy. supported silica, support has negligible influence structure. Nanoparticle dynamics must be...
We have studied using scanning tunneling microscopy (STM) the atomic-scale realm of molybdenum disulfide ( MoS2) nanoclusters, which are interest as a model system in hydrodesulfurization catalysis. The STM gives first real space images shape and edge structure single-layer MoS2 nanoparticles synthesized on Au(111), establishes new picture active sites nanoclusters. results demonstrate way to get detailed information catalysts general.
How zinc helps copper make methanol Copper nanoparticles can catalyze the formation of from a mixture CO 2 , CO, and H but adding oxide nanoparticles, themselves inactive in this reaction, greatly boosts rates. Kuld et al. measured how synthesis activity varies with coverage atoms on as determined experimentally density functional theory calculations. The ZnO nanoparticle size much covers surface turn controlled catalyst activity. Science issue p. 969
By the use of density functional calculations it is shown that edges a two-dimensional slab insulating MoS2 exhibit several metallic states. These edge states can be viewed as one-dimensional conducting wires, and we show they observed directly using scanning tunneling microscopy for single-layer nanoparticles grown on support.
This study addresses the sintering mechanism of Pt nanoparticles dispersed on a planar, amorphous Al2O3 support as model system for catalyst automotive exhaust abatement. By means in situ transmission electron microscopy (TEM), was monitored during exposure to 10 mbar air at 650 °C. Time-resolved image series unequivocally reveal that mediated by an Ostwald ripening process. A statistical analysis ensemble shows particle size distributions change shape from initial Gaussian distribution via...
Sintering of nanoparticles (NPs) Ni supported on MgAl2O4 was monitored in situ using transmission electron microscopy (TEM) during exposure to an equimolar mixture H2 and H2O at a pressure 3.6 mbar 750 °C, conditions relevant methane steam reforming. The TEM images revealed increase the mean particle size due disappearance smaller, immobile NPs resultant growth larger NPs. A new approach for predicting long-term sintering is presented wherein microscopic observations ripening individual...
Atoms on the edge: The atomic edge structure of industrial-style MoS2 nanocatalysts was imaged using single-atom sensitive electron microscopy (see picture). observed terminations match predictions model catalyst studies and thus address so-called "materials gap" in catalysis.
Understanding the size-dependent behavior of nanoparticles is crucial for optimizing catalytic performance. We investigate differences in selectivity size-selected gold CO2 electroreduction with sizes ranging from 1.5 to 6.5 nm. Our findings reveal an optimal size approximately 3 nm that maximizes toward CO, exhibiting up 60% Faradaic efficiency at low potentials. High-resolution transmission electron microscopy reveals different shapes particles and suggests multiply twinned are favorable...
Mechanisms and energetics of graphene growth catalyzed by nickel nanoclusters were studied using ab initio density functional theory calculations. It is demonstrated that step-edge sites act as the preferential centers for layers on surface. Carbon transported from deposition site at free surface to perimeter growing layer via or subsurface diffusion. Three different processes are identified govern layers, depending termination surface, it argued how these may lead nanofiber structures. The...
Atomic force microscopy in the non-contact mode (nc-AFM) can provide atom-resolved images of surface of, principle, any material independent its conductivity. Due to complex mechanisms involved contrast formation nc-AFM imaging, it is, however, far from trivial identify individual atoms or adsorbates AFM images. In this work, we successfully demonstrate how extract detailed information about defects and chemical identity on a metal oxide We make use observation that apex tip be altered...
The Dark Crystal: A hybrid material is reported that comprised of 1–2 nm sized gold nanoparticles, accessible only through zeolite micropores in a silicalite-1 crystal, as shown by three-dimensional TEM tomography (see picture). Calcination experiments indicate the embedded nanoparticles are highly stable towards sintering. Detailed facts importance to specialist readers published "Supporting Information". Such documents peer-reviewed, but not copy-edited or typeset. They made available...