| 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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Simonsen, Søren Bredmose
Technical University of Denmark
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (26/26 displayed)
- 2024Operando Electron Microscopy and Impedance Analysis of Solid Oxide Electrolysis and Fuel Cellscitations
- 2023Chemical Insights into the Formation of Colloidal Iridium Nanoparticles from In Situ X-ray Total Scatteringcitations
- 2022Surfactant-free syntheses and pair distribution function analysis of osmium nanoparticlescitations
- 2021Development of high-temperature electrochemical TEM and its application on solid oxide electrolysis cells
- 2021Development of high-temperature electrochemical TEM and its application on solid oxide electrolysis cells
- 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
- 2019Electrospun nanofiber materials for energy and environmental applications citations
- 2019Silver Modified Cathodes for Solid Oxide Fuel Cellscitations
- 2019Silver Modified Cathodes for Solid Oxide Fuel Cellscitations
- 2019Electrospun nanofiber materials for energy and environmental applicationscitations
- 2019Structural Characterization of Membrane-Electrode-Assemblies in High Temperature Polymer Electrolyte Membrane Fuel Cellscitations
- 2019Hydrothermal Synthesis, Characterization, and Sintering Behavior of Core-Shell Particles: A Principle Study on Lanthanum Strontium Cobaltite Coated with Nanosized Gadolinium Doped Ceriacitations
- 2019Hydrothermal Synthesis, Characterization, and Sintering Behavior of Core-Shell Particles: A Principle Study on Lanthanum Strontium Cobaltite Coated with Nanosized Gadolinium Doped Ceriacitations
- 2018Solutions for catalysis: A surfactant-free synthesis of precious metal nanoparticle colloids in mono-alcohols for catalysts with enhanced performances
- 2016Electron microscopy investigations of changes in morphology and conductivity of LiFePO4/C electrodescitations
- 2016Effects of strong cathodic polarization of the Ni-YSZ interfacecitations
- 2016Comparison of ultramicrotomy and focused-ion-beam for the preparation of TEM and STEM cross section of organic solar cellscitations
- 2016In-Situ Transmission Electron Microscopy on Operating Electrochemical Cells
- 2016Scandium-doped zinc cadmium oxide as a new stable n-type oxide thermoelectric materialcitations
- 2016Nanocomposite YSZ-NiO Particles with Tailored Structure Synthesized in a Two-Stage Continuous Hydrothermal Flow Reactor
- 2016Synthesis of ligand-free CZTS nanoparticles via a facile hot injection routecitations
- 2015Environmental TEM study of the dynamic nanoscaled morphology of NiO/YSZ during reductioncitations
- 2014NiO/YSZ Reduction for SOFC/SOEC Studied In Situ by Environmental Transmission Electron Microscopycitations
- 2011Sintering of oxide-supported Pt and Pd nanoparticles in air studied by in situ TEM
- 2011Atomic-scale non-contact AFM studies of alumina supported nanoparticles
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.