A5090008029- Electrocatalysts for Energy Conversion
- Catalytic Processes in Materials Science
- CO2 Reduction Techniques and Catalysts
- Ammonia Synthesis and Nitrogen Reduction
- Electrochemical Analysis and Applications
- Fuel Cells and Related Materials
- Catalysis and Oxidation Reactions
- Advanced Chemical Physics Studies
- Catalysts for Methane Reforming
- Advanced Photocatalysis Techniques
- Advanced battery technologies research
- Hydrogen Storage and Materials
- nanoparticles nucleation surface interactions
- Electron and X-Ray Spectroscopy Techniques
- Ionic liquids properties and applications
- Copper-based nanomaterials and applications
- Semiconductor materials and devices
- Chalcogenide Semiconductor Thin Films
- Molecular Junctions and Nanostructures
- Electronic and Structural Properties of Oxides
- Catalysis and Hydrodesulfurization Studies
- Nanomaterials for catalytic reactions
- TiO2 Photocatalysis and Solar Cells
- Quantum Dots Synthesis And Properties
- Advancements in Solid Oxide Fuel Cells
Technical University of Denmark
2016-2025
Surface (Brazil)
2023
European Synchrotron Radiation Facility
2023
Institute of Catalysis and Petrochemistry
2004-2020
Danish Geotechnical Society
2013-2020
Danish Academy of Technical Sciences
2019
The Ohio State University
2018
Haldor Topsoe (Denmark)
1998-2018
Centre for Cosmology and Particle Physics Phenomenology
2013-2014
Fuzhou University
2013
The identification of the active sites in heterogeneous catalysis requires a combination surface sensitive methods and reactivity studies. We determined site for hydrogen evolution, reaction catalyzed by precious metals, on nanoparticulate molybdenum disulfide (MoS 2 ) atomically resolving this catalyst before measuring electrochemical activity solution. By preparing MoS nanoparticles different sizes, we systematically varied distribution Au(111), which quantified with scanning tunneling...
The electrochemical hydrogen evolution reaction is catalyzed most effectively by the Pt group metals. As H2 considered as a future energy carrier, need for these catalysts will increase and alternatives to scarce expensive be needed. We analyze ability of different metal surfaces enzymes nitrogenase hydrogenase catalyze find necessary criterion high catalytic activity. that binding free atomic catalyst close zero. enables us search new catalysts, inspired active site, we MoS2 nanoparticles...
This perspective covers the use of molybdenum disulfide and related compounds, generally termed MoSx, as electro- or photoelectrocatalysts for hydrogen evolution reaction (HER). State art solutions well most illustrative results from extensive photoelectrocatalytic literature are given. The research strategies currently employed in field outlined future challenges pointed out. We suggest that key to optimising HER activity MoS2 is divided into (1) increasing catalytic active site, (2) number...
The high cost of low temperature fuel cells is to a large part dictated by the loading Pt required catalyse oxygen reduction reaction (ORR). Arguably most viable route decrease loading, and hence commercialise these devices, improve ORR activity alloying it with other metals. In this perspective paper we provide an overview fundamentals underlying on platinum its alloys. We also report Pt5La for first time, which shows 3.5- 4.5-fold improvement in over range 0.9 0.87 V, respectively. employ...
Detailed studies of elementary chemical processes on well-characterized single crystal surfaces have contributed substantially to the understanding heterogeneous catalysis. Insight into structure surface alloys combined with an relation between composition and reactivity is shown lead directly new ideas for catalyst design. The feasibility such approach illustrated by synthesis, characterization, tests a high-surface area gold-nickel steam reforming.
The high platinum loadings required to compensate for the slow kinetics of oxygen reduction reaction (ORR) impede widespread uptake low-temperature fuel cells in automotive vehicles. We have studied ORR on eight (Pt)-lanthanide and Pt-alkaline earth electrodes, Pt5M, where M is lanthanum, cerium, samarium, gadolinium, terbium, dysprosium, thulium, or calcium. materials are among most active polycrystalline Pt-based catalysts reported, presenting activity enhancement by a factor 3 6 over Pt....
H2O2 is a valuable, environmentally friendly oxidizing agent with wide range of uses from the provision clean water to synthesis valuable chemicals. The on-site electrolytic production would bring chemical applications beyond its present reach. successful commercialization electrochemical requires cathode catalysts high activity, selectivity, and stability. In this Perspective, we highlight our current understanding factors that control performance. We review influence catalyst material,...
ADVERTISEMENT RETURN TO ISSUEPREVViewpointNEXTElectrochemical Ammonia Synthesis—The Selectivity ChallengeAayush R. Singh†, Brian A. Rohr†, Jay Schwalbe†, Matteo Cargnello†, Karen Chan†‡, Thomas F. Jaramillo†‡, Ib Chorkendorff¶, and Jens K. Nørskov*†‡View Author Information† SUNCAT Center for Interface Science Catalysis, Department of Chemical Engineering, Stanford University, Stanford, California 94305, United States‡ SLAC National Accelerator Laboratory, Menlo Park, 94025, States¶ Physics,...
Brought to light: Thin, planar nanojunctions between layered MoS2 and graphitic CN (g-CN) were constructed allowed fast charge separation across the junction interfaces facilitate hydrogen photosynthesis. This research represents a proof of concept for rational fabrication thin interfacial junctions co-catalysts semiconductors having similar geometric structures. As service our authors readers, this journal provides supporting information supplied by authors. Such materials are peer reviewed...
The hydrogen evolution reaction (HER) on carbon supported MoS2nanoparticles is investigated and compared to findings with previously published work Au(111) MoS2. An investigation into MoS2oxidation presented used quantify the surface concentration of Other metal sulfides morphologies similar MoS2 such as WS2, cobalt-promoted were also in search for improved HER activity. Experimental are density functional theory (DFT) calculated values binding energies (ΔGH) each system.
Using adsorption experiments and density functional calculations we show that ${\mathrm{N}}_{2}$ dissociation on the Ru(0001) surface is totally dominated by steps. The measured rate at steps least 9 orders of magnitude higher than terraces 500 K, corresponding calculated difference in activation energy 1.5 eV. low barrier step shown to be due a combination electronic geometrical effects. consequences for Ru as catalyst ammonia synthesis are discussed.
The past 10 years have seen great advances in the field of electrochemical hydrogen evolution. In particular, several new nonprecious metal electrocatalysts, for example, MoS2 or Ni2P family materials, emerged as contenders evolution under harsh acidic conditions offering nearly platinum-like catalytic performance. developments been particularly fast last 5 years, and present Perspective highlights key discusses them, along with general, context global energy problem.
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
This communication examines the effect of surface morphology polycrystalline copper on electroreduction CO(2). We find that a nanoparticle covered electrode shows better selectivity towards hydrocarbons compared with two other studied surfaces, an electropolished and argon sputtered electrode. Density functional theory calculations provide insight into effect.