Journal
JOURNAL OF COLLOID AND INTERFACE SCIENCE
Volume 577, Issue -, Pages 319-328Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.jcis.2020.05.078
Keywords
Co4Cat process; Surfactant-free; Colloid; Platinum nanoparticles; Room temperature synthesis
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Funding
- Villum Foundation
- European Union [703366]
- Swiss National Science Foundation (SNSF) [200021 184742]
- French National Research Agency (ANR) [ANR10-EQPX45]
- Ministerium fur Bildung und Forschung (BMBF, ECatPEMFC) [FKZ 03SF0539]
- U.S. DOE [DE-AC02-06CH11357]
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A fast, simple, instrument-free room temperature synthesis of stable electroactive surfactant-free colloidal Pt nanoparticles in alkaline methanol and methanol-water mixtures is presented. Pair distribution function (PDF) analysis suggests that methoxy substitution of chloride ligands from H2PtCl6 occurs in methanol. X-ray absorption spectroscopy (MS) studies and UV-vis measurements show that solutions of H2PtCl6 in methanol age and are reduced to Pt(II) species over time. These species are ideal precursors to significantly reduce the induction period typically observed in colloidal Pt nanoparticle syntheses as well as the temperature needed to form nanoparticles. The room temperature synthesis presented here allows designing simple in situ studies of the nanoparticle formation. In situ infra-red spectroscopy gives insight into the formation and stabilization mechanism of surfactant-free nanoparticles by CO surface groups. Finally, the surfactant-free nanoparticles ca. 2-3 nm in diameter obtained are shown to be readily active electrocatalysts e.g. for methanol oxidation. The synthesis approach presented bears several advantages to design new studies and new syntheses of surfactant-free colloidal nanomaterials. (C) 2020 Elsevier Inc. All rights reserved.
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