Controlled Synthesis of Surfactant-Free Water-Dispersible Colloidal Platinum Nanoparticles by the Co4Cat Process

TY - JOUR

T1 - Controlled Synthesis of Surfactant-Free Water-Dispersible Colloidal Platinum Nanoparticles by the Co4Cat Process

AU - Quinson, Jonathan

AU - Kacenauskaite, Laura

AU - Bucher, Jan

AU - Simonsen, Søren B.

AU - Theil Kuhn, Luise

AU - Oezaslan, Mehtap

AU - Kunz, Sebastian

AU - Arenz, Matthias

PY - 2019

Y1 - 2019

N2 - 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., H 2 PtCl 6 ) 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 H 2 PtCl 6 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 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.

AB - 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., H 2 PtCl 6 ) 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 H 2 PtCl 6 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 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.

KW - Co4Cat

KW - colloids

KW - nanoparticles

KW - platinum

KW - water-dispersibility

U2 - 10.1002/cssc.201802897

DO - 10.1002/cssc.201802897

M3 - Journal article

C2 - 30673164

AN - SCOPUS:85063204448

SN - 1864-5631

VL - 12

SP - 1229

EP - 1239

JO - ChemSusChem

JF - ChemSusChem

IS - 6

ER -