Spectroscopic Evidence of Platinum Negative Oxidation States at Electrochemically Reduced Surfaces
| Autor: | Jacques Simonet, C. Mangeney,‡ and, Maryline Guilloux-Viry, M. Delamar, Corinne Lagrost, Philippe Hapiot, Jalal Ghilane |
|---|---|
| Přispěvatelé: | Institut des Sciences Chimiques de Rennes (ISCR), Centre National de la Recherche Scientifique (CNRS)-Institut de Chimie du CNRS (INC)-Université de Rennes 1 (UR1), Université de Rennes (UNIV-RENNES)-Université de Rennes (UNIV-RENNES)-Ecole Nationale Supérieure de Chimie de Rennes (ENSCR)-Institut National des Sciences Appliquées - Rennes (INSA Rennes), Institut National des Sciences Appliquées (INSA)-Université de Rennes (UNIV-RENNES)-Institut National des Sciences Appliquées (INSA), Interfaces, Traitements, Organisation et Dynamique des Systèmes (ITODYS (UMR_7086)), Université Paris Diderot - Paris 7 (UPD7)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), Université de Rennes (UR)-Institut National des Sciences Appliquées - Rennes (INSA Rennes), Institut National des Sciences Appliquées (INSA)-Institut National des Sciences Appliquées (INSA)-Ecole Nationale Supérieure de Chimie de Rennes (ENSCR)-Institut de Chimie du CNRS (INC)-Centre National de la Recherche Scientifique (CNRS), Institut National des Sciences Appliquées - Rennes (INSA Rennes), Institut National des Sciences Appliquées (INSA)-Université de Rennes (UNIV-RENNES)-Institut National des Sciences Appliquées (INSA)-Université de Rennes (UNIV-RENNES)-Centre National de la Recherche Scientifique (CNRS)-Ecole Nationale Supérieure de Chimie de Rennes-Université de Rennes 1 (UR1), Université de Rennes (UNIV-RENNES), Centre National de la Recherche Scientifique (CNRS)-Université Paris Diderot - Paris 7 (UPD7) |
| Jazyk: | angličtina |
| Rok vydání: | 2007 |
| Předmět: |
Inorganic chemistry
Salt (chemistry) chemistry.chemical_element 02 engineering and technology 010402 general chemistry Electrochemistry 01 natural sciences Spectral line Metal X-ray photoelectron spectroscopy Oxidation state Physical and Theoretical Chemistry chemistry.chemical_classification [CHIM.ORGA]Chemical Sciences/Organic chemistry 021001 nanoscience & nanotechnology 0104 chemical sciences Surfaces Coatings and Films Electronic Optical and Magnetic Materials General Energy chemistry visual_art Negative potential visual_art.visual_art_medium [PHYS.PHYS.PHYS-CHEM-PH]Physics [physics]/Physics [physics]/Chemical Physics [physics.chem-ph] 0210 nano-technology Platinum |
| Zdroj: | Journal of Physical Chemistry C Journal of Physical Chemistry C, American Chemical Society, 2007, 111, pp.5701-5707. ⟨10.1021/jp068879d⟩ Journal of Physical Chemistry C, 2007, 111, pp.5701-5707. ⟨10.1021/jp068879d⟩ |
| ISSN: | 1932-7447 1932-7455 |
| DOI: | 10.1021/jp068879d⟩ |
| Popis: | International audience; Electrochemical "reduction" of Pt was investigated using electrochemical and X-ray photoelectron spectroscopy (XPS) techniques. This transformation of a platinum metal, which is possible with a large variety of organic and inorganic cations, was investigated in DMF containing CsI salts chosen as a test system. Experiments show that considerable modifications of the chemical nature of the starting material accompany the morphological changes that were previously reported. With rather mild reduction conditions, cesium-platinides-like structures were detected. XPS investigations bring a direct spectroscopic evidence for the formation of a reduced platinum state from a metallic electrode held at a negative potential. XPS spectra clearly showed a significant and continuous shift of the Pt formal oxidation degree with the injected charge of -1.6. This behavior is analogous to a charging process. Additionally, proofs of the full reversibility of the phenomenon was provided by the XPS analyses showing that the "reduced Pt" returns to its metallic state after reaction with a diazonium salt. It is noticeable that the formation of negative oxidation state of Pt exists even when a large competitive electrochemical process occurs, as in our case with the reduction of protons from residual water. |
| Databáze: | OpenAIRE |
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