• 1.7 nm platinum nanoparticles: synthesis with glucose starch, characterization and catalysis.

1.7 nm platinum nanoparticles: synthesis with glucose starch, characterization and catalysis.

Chemphyschem : a European journal of chemical physics and physical chemistry (2010-08-18)
Christian Engelbrekt, Karsten Holm Sørensen, Teis Lübcke, Jingdong Zhang, Qingfeng Li, Chao Pan, Niels J Bjerrum, Jens Ulstrup

Monodisperse platinum nanoparticles (PtNPs) were synthesized by a green recipe. Glucose serves as a reducing agent and starch as a stabilization agent to protect the freshly formed PtNP cores in buffered aqueous solutions. Among the ten buffers studied, 2-(N-morpholino)ethanesulfonic acid (MES), ammonium acetate and phosphate are the best media for PtNP size control and fast chemical preparation. The uniform sizes of the metal cores were determined by transmission electron microscopy (TEM) and found to be 1.8 ± 0.5, 1.7 ± 0.2 and 1.6 ± 0.5 nm in phosphate, MES and ammonium acetate buffer, respectively. The estimated total diameter of the core with a starch coating layer is 5.8-6.0 nm, based on thermogravimetric analysis (TGA). The synthesis reaction is simple, environmentally friendly, highly reproducible, and easy to scale up. The PtNPs were characterized electrochemically and show high catalytic activity for reduction of dioxygen and hydrogen peroxide as well as for oxidation of dihydrogen. The PtNPs can be transferred to carbon support materials with little demand for high specific surface area of carbon. This enables utilization of graphitized carbon blacks to prepare well-dispersed Pt/C catalysts, which exhibit significantly improved durability in the accelerated aging test under fuel cell mimicking conditions.

Product Number
Product Description

MES hydrate, ≥99.5% (titration)
MES hydrate, BioUltra, ≥99.5% (T)
MES hydrate, ≥99.5% (titration), pH 2.5-4.0 (0.5 M in H2O), BioXtra
MES hydrate, BioPerformance Certified, suitable for cell culture, ≥99.5%
MES, low moisture content, ≥99% (titration)
MES sodium salt, BioReagent, ≥99% (titration), crystalline
MES solution, BioUltra, for molecular biology, 0.5 M in H2O
MES sodium salt, BioPerformance Certified, suitable for cell culture
MES sodium salt
MES sodium salt, ≥99% (titration)