Ionic Conductivity Measurements—A Powerful Tool for Monitoring Polyol Reduction Reactions
| Autor: | Klaus F. Wagenbauer, Melanie Miller, Veronika M. Burger, Hany A. El-Sayed, Hubert A. Gasteiger, Manuel Wagenhofer |
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| Rok vydání: | 2017 |
| Předmět: |
Materials science
Inorganic chemistry Nucleation chemistry.chemical_element 02 engineering and technology 010402 general chemistry 01 natural sciences Metal chemistry.chemical_compound Polyol Electrochemistry Ionic conductivity General Materials Science Iridium Spectroscopy chemistry.chemical_classification Surfaces and Interfaces 021001 nanoscience & nanotechnology Condensed Matter Physics 0104 chemical sciences Ruthenium chemistry visual_art visual_art.visual_art_medium 0210 nano-technology Platinum Ethylene glycol |
| Zdroj: | Langmuir. 33:13615-13624 |
| ISSN: | 1520-5827 0743-7463 |
| DOI: | 10.1021/acs.langmuir.7b03444 |
| Popis: | The reduction of metal precursors during the polyol synthesis of metal nanoparticles was monitored by ex situ ionic conductivity measurements. Using commonly used platinum precursors (K2PtCl6, H2PtCl6, and K2PtCl4) as well as iridium and ruthenium precursors (IrCl3 and RuCl3), we demonstrate that their reduction in ethylene glycol at elevated temperatures is accompanied by a predictable change in ionic conductivity, enabling a precise quantification of the onset temperature for their reduction. This method also allows detecting the onset temperature for the further reaction of ethylene glycol with HCl produced by the reduction of chloride-containing metal precursors (at ≈120 °C). On the basis of these findings, we show that the conversion of the metal precursor to reduced metal atoms/clusters can be precisely quantified, if the reaction occurs below 120 °C, which also enables a distinction between the stages of metal particle nucleation and growth. The latter is demonstrated by the reduction of H2PtCl6 in... |
| Databáze: | OpenAIRE |
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