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Controlled synthesis of surfactant-free water-dispersible colloidal platinum nanoparticles by the Co4Cat process

DOI: 10.1002/cssc.201802897 DOI Help

Authors: Jonathan Quinson (University of Copenhagen) , Laura Kacenauskaite (University of Copenhagen) , Jan Bucher (University of Bern) , Søren Simonsen (Technical University of Denmark) , Luise Theil Kuhn (Technical University of Denmark) , Mehtap Oezaslan (Carl von Ossietzky University of Oldenburg) , Sebastian Kunz (University of Bremen Leobenerstraße) , Matthias Arenz (University of Berne)
Co-authored by industrial partner: No

Type: Journal Paper
Journal: Chemsuschem

State: Published (Approved)
Published: January 2019
Diamond Proposal Number(s): 12746

Abstract: The recently reported Co4Cat process is a synthesis method bearing ecological and economic benefits to prepare precious metal nanoparticles (NPs) with optimized catalytic properties. In the Co4Cat process a metal precursor (e.g. H2PtCl6) is dissolved in an alkaline solution of a low boiling point solvent (methanol) and reduced to NPs at low temperature (< 80 °C) without the use of surfactants. We here describe in detail the Co4Cat process to prepare Pt NPs. The advantages of this new synthesis method for research and development, but also industrial production, are highlighted in a comparison with the popular ’polyol’ synthesis. The reduction of H2PtCl6 from Pt(IV) to Pt(II) and further to Pt(0) is followed by UV‐vis and XANES/EXAFS measurements. It is demonstrated how the synthesis can be accelerated, how size control is achieved and how the colloidal dispersions can be stabilized without the use of surfactants. Despite being surfactant‐free, the Pt NPs exhibit surprisingly long term (up 16 months) stability in water over a wide pH range (4‐12) and in aqueous buffer solutions. The Co4Cat process is thus relevant to produce NPs for heterogeneous catalysis, electro‐catalysis or bio/medical applications.

Journal Keywords: Co4Cat technology; Colloids; Nanoparticles; Water-dispersibility; Synthesis

Subject Areas: Chemistry

Instruments: B18-Core EXAFS

Other Facilities: Swiss Light Source (SLS)