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Solvent‐dependent growth and stabilization mechanisms of surfactant‐free colloidal Pt nanoparticles

DOI: 10.1002/chem.202001553 DOI Help

Authors: Jonathan Quinson (University of Copenhagen) , Sarah Neumann (University of Bremen) , Laura Kacenauskaite (University of Copenhagen) , Jan Bucher (University of Bern) , Jacob J. K. Kirkensgaard (University of Copenhagen) , Søren B. Simonsen (University of Denmark) , Luise Theil Kuhn (University of Denmark) , Alessandro Zana (University of Bern) , Tom Vosch (University of Copenhagen) , Mehtap Oezaslan (Carl von Ossietzky University of Oldenburg; echnical University of Braunschweig) , Sebastian Kunz (University of Bremen; Südzucker AG) , Matthias Arenz (University of Bern)
Co-authored by industrial partner: Yes

Type: Journal Paper
Journal: Chemistry – A European Journal , VOL 26 , PAGES 9012 - 9023

State: Published (Approved)
Published: July 2020
Diamond Proposal Number(s): 12746

Abstract: 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.

Journal Keywords: Co4Cat technology; colloids; nanoparticles; surfactant-free; synthesis

Subject Areas: Chemistry, Materials

Instruments: B18-Core EXAFS

Other Facilities: Swiss Light Source

Added On: 23/07/2020 13:33

Discipline Tags:

Physical Chemistry Catalysis Chemistry Materials Science Organic Chemistry Nanoscience/Nanotechnology

Technical Tags:

Spectroscopy X-ray Absorption Spectroscopy (XAS) X-ray Absorption Near Edge Structure (XANES)