The Influence of Oxide on the Electrochemical Processes in K 2NbF7 ‐ NaCl ‐ KCl Melts
| Autor: | Gérard Picard, Frédéric Lantelme, J. H. Von Barner, Y. Berghoute |
|---|---|
| Rok vydání: | 1995 |
| Předmět: |
chemistry.chemical_classification
Renewable Energy Sustainability and the Environment Inorganic chemistry Niobium Oxide chemistry.chemical_element Condensed Matter Physics Surfaces Coatings and Films Electronic Optical and Magnetic Materials chemistry.chemical_compound Crystallography chemistry Transition metal Content (measure theory) Materials Chemistry Electrochemistry Niobium oxide Cyclic voltammetry Platinum Inorganic compound |
| Zdroj: | Lantelme, F, Berghoute, Y, Barner, J H V & Picard, G S 1995, ' The influence of oxide on the electrochemical processes in K2NbF7-NaCl-KCl melts ', Journal of The Electrochemical Society, vol. 142, no. 12, pp. 4097-4102 . https://doi.org/10.1149/1.2048470 |
| ISSN: | 1945-7111 0013-4651 |
| DOI: | 10.1149/1.2048470 |
| Popis: | Transient electrochemical techniques showed that in NaCl-KCl melts the reduction of K{sub 2}NbF{sub 7} occurs through a two-step reaction Nb(V) {yields} Nb(IV) {yields} Nb. When oxide ions were introduced, cyclic voltammetry indicated that the waves corresponding to reduction of the complex NbF{sub 7}{sup 2{minus}} progressively disappeared. Oxo complexes, such as NbOF{sub n}{sup (n{minus}3){minus}}, are reduced at a potential close to that of the Nb(IV) fluoro complexes. Niobium metal deposition was perturbed by the formation of niobium suboxides like NbO or Nb{sub 4}O{sub 5}. For molar ratios of oxide to Nb greater than one, a black layer of niobium oxide, NbO{sub 2}, appeared at the electrode surface. The present study confirms the high oxygen affinity of niobium and shows that a careful purification of the electrolyte and feeding materials is required for producing niobium with a low oxygen content. |
| Databáze: | OpenAIRE |
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