| 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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Arenz, Matthias
University of Bern
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (23/23 displayed)
- 2024Monitoring the Morphological Changes of Skeleton-PtCo Electrocatalyst during PEMFC Start-Up/Shut-Downprobed by in situ WAXS and SAXScitations
- 2024Monitoring the Morphological Changes of Skeleton-PtCo Electrocatalyst during PEMFC Start-Up/Shut-Down probed by in situ WAXS and SAXS.citations
- 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
- 2023Formation of intermetallic PdIn nanoparticles: influence of surfactants on nanoparticle atomic structurecitations
- 2023The more the bettercitations
- 2022Nanocomposite Concept for Electrochemical In Situ Preparation of Pt–Au Alloy Nanoparticles for Formic Acid Oxidationcitations
- 2022Nanocomposite Concept for Electrochemical in Situ Preparation of Pt-Au Alloy Nanoparticles for Formic Acid Oxidationcitations
- 2022High entropy alloy nanoparticle formation at low temperatures
- 2021Operando SAXS study of a Pt/C fuel cell catalyst with an X-ray laboratory sourcecitations
- 2021The Gas Diffusion Electrode Setup as Straightforward Testing Device for Proton Exchange Membrane Water Electrolyzer Catalysts
- 2021Elucidating Pt-Based Nanocomposite Catalysts for the Oxygen Reduction Reaction in Rotating Disk Electrode and Gas Diffusion Electrode Measurementscitations
- 2021Bifunctional Pt-IrO2Catalysts for the Oxygen Evolution and Oxygen Reduction Reactionscitations
- 2021Bayesian optimization of high‐entropy alloy compositions for electrocatalytic oxygen reductioncitations
- 2020Solvent-dependent growth and stabilization mechanisms of surfactant-free colloidal Pt nanoparticlescitations
- 2020Solvent-dependent growth and stabilization mechanisms of surfactant-free colloidal Pt nanoparticlescitations
- 2020The Dissolution Dilemma for Low Pt Loading Polymer Electrolyte Membrane Fuel Cell Catalystscitations
- 2018On the Preparation and Testing of Fuel Cell Catalysts Using the Thin Film Rotating Disk Electrode Methodcitations
- 2018Solutions for catalysis: A surfactant-free synthesis of precious metal nanoparticle colloids in mono-alcohols for catalysts with enhanced performances
Places of action
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conferencepaper
Solutions for catalysis: A surfactant-free synthesis of precious metal nanoparticle colloids in mono-alcohols for catalysts with enhanced performances
Abstract
To optimize precious metal nanocatalysts, an optimal set of nanoparticle (NP) properties (<i>composition, size, loading, etc</i>.)must match specific operating conditions. Synthesis routes offeringindependent control on NP properties are then highly desired: (1) tostudy which combinations of properties are key for an application, (2)to optimize performances, (3) to develop industrial applications if theproduction method is scalable.<br/>Independent control on heterogeneouscatalysts' properties is challenging with the direct formation of NPs onsupports: agglomeration and NP formation in pores lead tounderutilization of the precious metal under catalytic operation.Ourstrategy is to use colloids to optimise independently several physicalproperties of the NPs.Yet in colloidal productions, surfactants aretypically required and need to be removed in energy and time consumingsteps, resulting in loss of catalytic performances due to sintering andpoisoning.<br/><br/>A surfactant-free colloidal synthesis adressing theprevious challenges is presented. Pt NPs are obtained at low temperature(< 80 C) in alkaline mono-alcohols. The method is robust,reproducible, promisingly scalable and flexible (e.g. using microwaves,hot water bath, UV irradiation, flow systems). The mono-alcoholsynthesis shows multiple benefits over alternative routes. It isinterestingly sensitive to parameters screened in other approaches. Theinfluence of solvents,<sup> </sup>time of synthesis and nature of base<sup> </sup>toachieve NP size in the range 1-6 nm and colloidal stability overseveral months, including in aqueous media, are detailed. The NPs arecharacterized by TEM, STEM, FTIR, SAXS, PDF, XAS, and electrochemicalmethods.<br/>The energy, time and cost effective production of NPs in lowboiling point solvents leads to improved catalytic performancescompared to industrial benchmark for chemical production (butanonehydrogenation) and energy conversion (oxygen reduction).