| People | Locations | Statistics |
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| Naji, M. |
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| Motta, Antonella |
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| Aletan, Dirar |
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| Mohamed, Tarek |
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| Ertürk, Emre |
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| Taccardi, Nicola |
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| Kononenko, Denys |
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| Petrov, R. H. | Madrid |
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| Alshaaer, Mazen | Brussels |
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| Bih, L. |
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| Casati, R. |
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| Muller, Hermance |
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| Kočí, Jan | Prague |
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| Šuljagić, Marija |
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| Kalteremidou, Kalliopi-Artemi | Brussels |
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| Azam, Siraj |
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| Ospanova, Alyiya |
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| Blanpain, Bart |
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| Ali, M. A. |
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| Popa, V. |
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| Rančić, M. |
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| Ollier, Nadège |
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| Azevedo, Nuno Monteiro |
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| Landes, Michael |
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| Rignanese, Gian-Marco |
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Kuhn, Luise Theil
Technical University of Denmark
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (30/30 displayed)
- 2023Chemical Insights into the Formation of Colloidal Iridium Nanoparticles from In Situ X-ray Total Scatteringcitations
- 2023Chemical Insights into the Formation of Colloidal Iridium Nanoparticles from In Situ X-ray Total Scattering:Influence of Precursors and Cations on the Reaction Pathwaycitations
- 2022Temperature dependence in Bragg edge neutron transmission measurementscitations
- 2022Surfactant-free syntheses and pair distribution function analysis of osmium nanoparticlescitations
- 2021Co oxidation state at LSC-YSZ interface in model solid oxide electrochemical cellcitations
- 2020Solvent-dependent growth and stabilization mechanisms of surfactant-free colloidal Pt nanoparticlescitations
- 2020Solvent-dependent growth and stabilization mechanisms of surfactant-free colloidal Pt nanoparticlescitations
- 2018Solutions for catalysis: A surfactant-free synthesis of precious metal nanoparticle colloids in mono-alcohols for catalysts with enhanced performances
- 2017Coupling between creep and redox behavior in nickel - yttria stabilized zirconia observed in-situ by monochromatic neutron imagingcitations
- 2017Coupling between creep and redox behavior in nickel - yttria stabilized zirconia observed in-situ by monochromatic neutron imagingcitations
- 2016In-Situ Transmission Electron Microscopy on Operating Electrochemical Cells
- 2015Environmental TEM study of the dynamic nanoscaled morphology of NiO/YSZ during reductioncitations
- 2015Need for In Operando Characterization of Electrochemical Interface Features
- 2015Functionally Graded Ceramics Fabricated with Side-by-Side Tape Casting for Use in Magnetic Refrigerationcitations
- 2014NiO/YSZ Reduction for SOFC/SOEC Studied In Situ by Environmental Transmission Electron Microscopycitations
- 2013Transmission Electron Microscopy Specimen Preparation Method for Multiphase Porous Functional Ceramicscitations
- 2013Transmission Electron Microscopy Specimen Preparation Method for Multiphase Porous Functional Ceramicscitations
- 2013Full Ceramic Fuel Cells Based on Strontium Titanate Anodes, An Approach Towards More Robust SOFCscitations
- 2013Full Ceramic Fuel Cells Based on Strontium Titanate Anodes, An Approach Towards More Robust SOFCscitations
- 2012Performance-Microstructure Relations in Ni/CGO Infiltrated Nb-doped SrTiO3 SOFC Anodescitations
- 2012Performance-Microstructure Relations in Ni/CGO Infiltrated Nb-doped SrTiO3 SOFC Anodescitations
- 2012Microstructural evolution of nanosized Ce 0.8 Gd 0.2 O 1.9 /Ni infiltrate in a Zr 0.84 Y 0.16 O 1.92 -Sr 0.94 Ti 0.9 Nb 0.1 O 3-δ based SOFC anode under electrochemical evaluation
- 2012Microstructural evolution of nanosized Ce0.8Gd0.2O1.9/Ni infiltrate in a Zr0.84Y0.16O1.92-Sr0.94Ti0.9Nb0.1O3-δ based SOFC anode under electrochemical evaluation
- 2011Nanostructured PLD-grown gadolinia doped ceria: Chemical and structural characterization by transmission electron microscopy techniquescitations
- 2011The effects of thermal annealing on the structure and the electrical transport properties of ultrathin gadolinia-doped ceria films grown by pulsed laser depositioncitations
- 2011Spin reorientation in α-Fe2O3 nanoparticles induced by interparticle exchange interactions in alpha-Fe2O3/NiO nanocompositescitations
- 2010Properties of magnetocaloric La(Fe,Co,Si)13 produced by powder metallurgycitations
- 2010Pulsed laser deposition of gadolinia doped ceria layers at moderate temperature – a seeding approach
- 2008Nanoscale chemical analysis and imaging of solid oxide cellscitations
- 2006Magnetic and Mössbauer spectroscopy studies of nanocrystalline iron oxide aerogelscitations
Places of action
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article
Chemical Insights into the Formation of Colloidal Iridium Nanoparticles from In Situ X-ray Total Scattering
Abstract
Iridium nanoparticles are important catalysts for several chemical and energy conversion reactions. Studies of iridium nanoparticles have also been a key for the development of kinetic models of nanomaterial formation. However, compared to other metals such as gold or platinum, knowledge on the nature of prenucleation species and structural insights into the resultant nanoparticles are missing, especially for nanoparticles obtained from Ir<i><sub>x</sub></i>Cl<i><sub>y</sub></i> precursors investigated here. We use <i>in situ</i> X-ray total scattering (TS) experiments with pair distribution function (PDF) analysis to study a simple, surfactant-free synthesis of colloidal iridium nanoparticles. The reaction is performed in methanol at 50 °C with only a base and an iridium salt as precursor. From different precursor salts─IrCl<sub>3</sub>, IrCl<sub>4</sub>, H<sub>2</sub>IrCl<sub>6</sub>, or Na<sub>2</sub>IrCl<sub>6</sub>─colloidal nanoparticles as small as Ir<sub>∼55</sub> are obtained as the final product. The nanoparticles do not show the bulk iridium face-centered cubic (<i>fcc</i>) structure but show decahedral and icosahedral structures. The formation route is highly dependent on the precursor salt used. Using IrCl<sub>3</sub> or IrCl<sub>4</sub>, metallic iridium nanoparticles form rapidly from Ir<sub><i>x</i></sub>Cl<sub><i>y</i></sub><i><sup>n-</sup></i> complexes, whereas using H<sub>2</sub>IrCl<sub>6</sub> or Na<sub>2</sub>IrCl<sub>6</sub>, the iridium nanoparticle formation follows a sudden growth after an induction period and the brief appearance of a crystalline phase. With H<sub>2</sub>IrCl<sub>6</sub>, the formation of different Ir<sub><i>n</i></sub> (<i>n</i> = 55, 55, 85, and 116) nanoparticles depends on the nature of the cation in the base (LiOH, NaOH, KOH, or CsOH, respectively) and larger particles are obtained with larger cations. As the particles grow, the nanoparticle structure changes from partly icosahedral to decahedral. The results show that the synthesis of iridium nanoparticles from Ir<sub><i>x</i></sub>Cl<sub><i>y</i></sub> is a valuable iridium nanoparticle model system, which can provide new compositional and structural insights into iridium nanoparticle formation and growth.