Pentavalent tantalum reduction mechanism from 1-butyl-3-methyl pyrrolidinium bis(trifluoromethylsulfonyl)imide ionic liquid
| Autor: | Maguy Nahra, Eric Chainet, Lenka Svecova |
|---|---|
| Přispěvatelé: | Laboratoire d'Electrochimie et de Physico-chimie des Matériaux et des Interfaces (LEPMI ), Institut de Chimie du CNRS (INC)-Institut National Polytechnique de Grenoble (INPG)-Institut polytechnique de Grenoble - Grenoble Institute of Technology (Grenoble INP )-Université Joseph Fourier - Grenoble 1 (UJF)-Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])-Centre National de la Recherche Scientifique (CNRS) |
| Rok vydání: | 2015 |
| Předmět: |
Cyclic voltammetry
Tantalum pentafluoride Working electrode Electroreduction mechanism Chemistry General Chemical Engineering Inorganic chemistry [BMPyr][TFSI] ionic liquid Tantalum chemistry.chemical_element Electrolyte Electrochemistry EQCM chemistry.chemical_compound [CHIM.ANAL]Chemical Sciences/Analytical chemistry Ionic liquid Imide |
| Zdroj: | Electrochimica Acta Electrochimica Acta, Elsevier, 2015, 182, pp.891-899. ⟨10.1016/j.electacta.2015.09.106⟩ |
| ISSN: | 0013-4686 |
| DOI: | 10.1016/j.electacta.2015.09.106 |
| Popis: | International audience; In this paper, we report and discuss the reduction mechanism of pentavalent tantalum salt (TaF5) in a room temperature ionic liquid (RTIL) by coupling two complementary electrochemical techniques: the cyclic voltammetry and the electrochemical quartz crystal microbalance (EQCM). The experiments were performed in the hydrophobic 1-butyl-3-methyl pyrrolidinium bis(trifluoromethylsulfonyl) imide ([BMPyr][TFSI]) RTIL used both as a solvent and as an electrolyte. Four different reduction peaks are present in the obtained voltammogram in the range from 0 V (vs Pt-Fc/Fc+) to −3.5 V (vs Pt-Fc/Fc+). The existence of the first reduction peak depends mainly on the nature of the substrate of the working electrode and is therefore not related to the reduction of the tantalum salt. The second reduction peak is ascribed to the direct tantalum salt reduction to its metallic state. During this reduction, free fluoride ions are produced in the electrolyte in the vicinity of the electrode surface. These ions can then react with diffusing TaF5 to form TaF5+x−x complexes and thus the reduction peaks occurring at lower potential are referred to the reduction of such complexes. This hypothesis was confirmed by addition of LiF in the electrolyte. |
| Databáze: | OpenAIRE |
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