Electrochemical and Spectroscopic Studies of Tungsten Species in the AlCl3 ‐ NaClsat Melt
| Autor: | Guang‐Sen Chen, Yihui Yang, Ellen Hondrogiannis, Gleb Mamantov, Haiming Xiao |
|---|---|
| Rok vydání: | 1995 |
| Předmět: |
chemistry.chemical_classification
Tungsten Compounds Valence (chemistry) Renewable Energy Sustainability and the Environment Inorganic chemistry Analytical chemistry chemistry.chemical_element Chronoamperometry Tungsten Condensed Matter Physics Electrochemistry Electron spectroscopy Surfaces Coatings and Films Electronic Optical and Magnetic Materials chemistry Oxidation state Materials Chemistry Inorganic compound |
| Zdroj: | Journal of The Electrochemical Society. 142:1758-1765 |
| ISSN: | 1945-7111 0013-4651 |
| Popis: | The electrochemical behavior of KWCl{sub 6} in the AlCl{sub 3}-NaCl{sub sat} melt at 175 to 200 C was investigated using multiple electrochemical methods: cyclic, normal pulse, square wave voltammetries, chronoamperometry, and exhaustive electrolysis. Electronic spectroscopy and x-ray diffraction methods were employed to characterize the products formed at different potentials. The melt was treated-with CCl{sub 4} to remove oxide impurities. It was found that the reduction sequence of W(V) was dependent on the scan rate, i.e., at fast scan rates three main redox couples were observed, while additional redox couples appeared in low scan rate voltammograms. To reach a better understanding of the mechanism, some low oxidation state tungsten compounds (K{sub 2}WCl{sub 6} and W{sub 6}Cl{sub 12}) were also examined. The reduction of W(V) to tungsten metal involves several intermediate oxidation states and cluster species, such as W(IV), unstable W(III), dimers W(IV, III) and W(III,II), [W{sub 6}Cl{sub 8}]{sup 4+} and its one-electron reduction product. Partial characterization of some of the intermediate reduction products has been achieved. |
| Databáze: | OpenAIRE |
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