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.
Here, the Co4Cat process to prepare Pt NPs is described in detail. 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 PtIV to PtII and further to Pt0
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 to 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.
Original language | English |
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Journal | ChemSusChem |
Volume | 12 |
Issue number | 6 |
Pages (from-to) | 1229-1239 |
ISSN | 1864-5631 |
DOIs | |
Publication status | Published - 2019 |
Keywords
- Co4Cat
- Colloids
- Nanoparticles
- Platinum
- Water-dispersibility