Publications
| 2024 (2) | 2023 (5) | 2022 (3) | 2021 (5) |
| 2020 (3) | 2019 (12) | 2018 (5) | 2017 (3) |
| 2016 (4) | 2015 (2) | 2014 (4) | 2013 (7) |
| 2012 (7) | 2011 (1) | 2010 (2) | 2008 (1) |
2017 | Articles and Reviews
Synthesis of Ce2O2S and Gd2(1– y)Ce2yO2S Nanoparticles and Reactivity from in Situ X-ray Absorption Spectroscopy and X-ray Photoelectron Spectroscopy
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This article describes the synthesis of bimetallic oxysulftide nanoplatelets. They could be obtained over the whole (Gd,Ce) composition range with good control of size and cristallinity. We observed that cerium-rich nanoparticles are less stable in air than Gd-rich nanoparticles. With in situ X-ray absorption and X-ray photoelectron spectroscopy, we could demonstrate that (i) all these nanoparticles actually exhibit surface sulfate, (ii) sulfate form as a consequence of exposure to water and/or oxygen, (iii) there is a threshold of 50% Ce above which the structure is not stable anymore in air, due to the formation of Ce(IV) species. |
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C. Larquet, A.-M. Nguyen, M. Ávila-Gutiérrez, L. Tinat, B. Lassalle-Kaiser, J.-J. Gallet, F. Bournel, A. Gauzzi, C. Sanchez, S. Carenco, Inorg. Chem. 2017, 22, 14227-14236 |
In Situ Solid-Gas Reactivity of Nanoscaled Metal Borides from Molten Salt Synthesis
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Our study about cobalt boride nanoparticles, led by David Portehault, uses Near-Ambient-Pressure XPS to monitor the behavior of this CO2 methanation catalyst. We uncovered that the crystalline structure is not stable in reducing conditions and evolves to metallic cobalt and boron oxide. This surprising result was confirmed by NEXAFS measurements and additional characterizations. |
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G. Gouget, D. P. Debecker, A. Kim, G. Olivieri, J.-J. Gallet, F. Bournel, C. Thomas, O. Ersen, S. Moldovan, C. Sanchez, S. Carenco, D. Portehault. Inorg. Chem. 2017, 56, 9225–9234 |
The Birth of Nickel Phosphides Catalysts: Monitoring Phosphorus Insertion into Nickel
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Using in situ ambient-pressure X-ray photoelectron spectroscopy, the formation of nickel phosphide on the surface of a nickel foil was investigated, at temperatures like those employed to form nickel phosphide nanoparticles in colloidal route using tri-n-octylphosphine as a phsophorus source. Our results demonstrate that even below 150 °C, significant phosphorus and carbon incorporation can occur during metal nanoparticles syntheses that employ TOP as stabilizing agent. These findings provide new insight on the surface chemistry of metal phosphide nanoparticles, increasingly employed in several fields of catalysis. |
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S. Carenco, Z. Liu, M. Salmeron, ChemCatChem 2017, 9, 2318–2323 |
