| 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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Rossmeisl, Jan
University of Copenhagen
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (51/51 displayed)
- 2024Catalysis of C-N coupling on High-Entropy alloyscitations
- 2024Toward understanding CO oxidation on high-entropy alloy electrocatalystscitations
- 2024Preparation and characterization of bimetallic and multimetallic nanostructured materials for electrocatalysis
- 2023The more the better:on the formation of single-phase high entropy alloy nanoparticles as catalysts for the oxygen reduction reactioncitations
- 2023Chemical Insights into the Formation of Colloidal Iridium Nanoparticles from In Situ X-ray Total Scatteringcitations
- 2023Tuning the chemical composition of binary alloy nanoparticles to prevent their dissolutioncitations
- 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
- 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
- 2023The more the better: on the formation of single-phase high entropy alloy nanoparticles as catalysts for the oxygen reduction reactioncitations
- 2023Steering carbon dioxide reduction toward C–C coupling using copper electrodes modified with porous molecular filmscitations
- 2023The more the bettercitations
- 2022Rational Catalyst Design for Higher Propene Partial Electro-oxidation Activity by Alloying Pd with Aucitations
- 2022Breaking with the Principles of Coreduction to Form Stoichiometric Intermetallic PdCu Nanoparticlescitations
- 2022Unravelling composition-activity-stability trends in high entropy alloy electrocatalysts by using a data‐guided combinatorial synthesis strategy and computational modelingcitations
- 2022High entropy alloy nanoparticle formation at low temperatures
- 2022Can the CO 2 Reduction Reaction Be Improved on Cu:Selectivity and Intrinsic Activity of Functionalized Cu Surfacescitations
- 2022Can the CO2Reduction Reaction Be Improved on Cucitations
- 2021What makes high‐entropy alloys exceptional electrocatalysts?citations
- 2021Bayesian optimization of high‐entropy alloy compositions for electrocatalytic oxygen reductioncitations
- 2021Was macht Hochentropie‐Legierungen zu außergewöhnlichen Elektrokatalysateuren?citations
- 2020Complex‐solid‐solution electrocatalyst discovery by computational prediction and high‐throughput experimentationcitations
- 2020P-block single-metal-site tin/nitrogen-doped carbon fuel cell cathode catalyst for oxygen reduction reactioncitations
- 2019High-Entropy Alloys as a Discovery Platform for Electrocatalysiscitations
- 2019Multiple Reaction Paths for CO Oxidation on a 2D SnO x Nano-Oxide on the Pt(110) Surface: Intrinsic Reactivity and Spillovercitations
- 2018Trends in Activity and Dissolution on RuO2 under Oxygen Evolution Conditions: Particles versus Well-Defined Extended Surfacescitations
- 2018Topotactic Growth of Edge-Terminated MoS 2 from MoO 2 Nanocrystalscitations
- 2018Topotactic Growth of Edge-Terminated MoS2 from MoO2 Nanocrystalscitations
- 2017New Platinum Alloy Catalysts for Oxygen Electroreduction Based on Alkaline Earth Metalscitations
- 2017New Platinum Alloy Catalysts for Oxygen Electroreduction Based on Alkaline Earth Metalscitations
- 2016Exploring the Lanthanide Contraction to Tune the Activity and Stability of Pt
- 2016Exploring the Lanthanide Contraction to Tune the Activity and Stability of Pt
- 2016A DFT Structural Investigation of New Bimetallic PtSn x Surface Alloys Formed on the Pt(110) Surface and Their Interaction with Carbon Monoxidecitations
- 2016Correlation between diffusion barriers and alloying energy in binary alloyscitations
- 2016Investigating the coverage dependent behaviour of CO on Gd/Pt(111)citations
- 2015Controlling the Activity and Stability of Pt-Based Electrocatalysts By Means of the Lanthanide Contraction
- 2015Correlating Structure and Oxygen Reduction Activity on Y/Pt(111) and Gd/Pt(111) Single Crystals
- 2015Comparison between the Oxygen Reduction Reaction Activity of Pd<sub>5</sub>Ce and Pt<sub>5</sub>Ce: The Importance of Crystal Structurecitations
- 2014Understanding the Oxygen Reduction Reaction on a Y/Pt(111) Single Crystal
- 2014Intermetallic Alloys as CO Electroreduction Catalysts-Role of Isolated Active Sitescitations
- 2014Engineering the Activity and Stability of Pt-Alloy Cathode Fuel-Cell Electrocatalysts by Tuning the Pt-Pt Distance
- 2014H 2 production through electro-oxidation of SO 2 :identifying the fundamental limitationscitations
- 2013Generalized trends in the formation energies of perovskite oxidescitations
- 2013First Principles Investigation of Zinc-anode Dissolution in Zinc-air Batteriescitations
- 2012The atomic structure of protons and hydrides in Sm1.92Ca0.08Sn2O7-δ pyrochlore from DFT calculations and FTIR spectroscopycitations
- 2012Understanding the electrocatalysis of oxygen reduction on platinum and its alloyscitations
- 2012Universality in Oxygen Reduction Electrocatalysis on Metal Surfacescitations
- 2011On the behavior of Brønsted-Evans-Polanyi relations for transition metal oxidescitations
- 2011Tuning the activity of Pt(111) for oxygen electroreduction by subsurface alloying
- 2011Hydrogen evolution on Au(111) covered with submonolayers of Pdcitations
- 2011Tuning the Activity of Pt(111) for Oxygen Electroreduction by Subsurface Alloyingcitations
- 2011Trends in Metal Oxide Stability for Nanorods, Nanotubes, and Surfacescitations
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.