Solvent‐Dependent Growth and Stabilization Mechanisms of Surfactant‐Free Colloidal Pt Nanoparticles

Understanding the formation of nanoparticles (NPs) is key to develop materials by sustainable routes. The Co4CatTM process is a new synthesis of precious metal NPs in alkaline mono‐alcohols well‐suited to develop active nanocatalysts. The synthesis is ‘facile’, surfactant‐free and performed under mi...

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Published inChemistry : a European journal Vol. 26; no. 41; pp. 9012 - 9023
Main Authors Quinson, Jonathan, Neumann, Sarah, Kacenauskaite, Laura, Bucher, Jan, Kirkensgaard, Jacob J. K., Simonsen, Søren B., Theil Kuhn, Luise, Zana, Alessandro, Vosch, Tom, Oezaslan, Mehtap, Kunz, Sebastian, Arenz, Matthias
Format Journal Article
LanguageEnglish
Published Germany Wiley Subscription Services, Inc 22.07.2020
Subjects
Alcohols
Chemistry
Co4Cat technology
colloids
Continuous sintering
Ethanol
Low temperature
Nanoparticles
Nucleation
Oxidation
Solvents
Stabilization
surfactant-free
Surfactants
Synthesis
synthesis
Surfactant-free
nanoparticles
Co4Cat technology
Colloids
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Summary:Understanding the formation of nanoparticles (NPs) is key to develop materials by sustainable routes. The Co4CatTM process is a new synthesis of precious metal NPs in alkaline mono‐alcohols well‐suited to develop active nanocatalysts. The synthesis is ‘facile’, surfactant‐free and performed under mild conditions like low temperature. The reducing properties of the solvent are here shown to strongly influence the formation of Pt NPs. Based on the in situ formation of CO adsorbed on the NP surface by solvent oxidation, a model is proposed that accounts for the different growth and stabilization mechanisms as well as re‐dispersion properties of the surfactant‐free NPs in different solvents. Using in situ and ex situ characterizations, it is established that in methanol, a slow nucleation with a limited NP growth is achieved. In ethanol, a fast nucleation followed by continuous and pronounced particle sintering occurs. Surfactant‐free Pt nanoparticles: The careful consideration of the reducing properties of simple solvents like methanol or ethanol are key to control the growth mechanisms, stability and redispersion properties of colloidal surfactant‐free Pt nanoparticles. The results provide guidelines to rationally select solvents in surfactant‐free syntheses for fundamental and applied research.
Bibliography:These authors contributed equally.
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ISSN:0947-6539
1521-3765
DOI:10.1002/chem.202001553