Examination of niobium electrochemistry from the reduction of Nb3Cl8 in molten LiCl-KCl eutectic

M. Mohamedi, Y. Sato, T. Yamamura

Research output: Contribution to journalArticle

9 Citations (Scopus)

Abstract

Solubility and electrochemical properties of Nb3Cl8 in LiCl-KCl eutectic melt were examined. It was found that the maximum solubility of Nb3Cl8 is not higher than 0.8 wt% within the 400-500°C temperature range. At a tungsten electrode, Nb3Cl8 is reduced to metallic niobium through two consecutive electrochemical steps: a first reversible step involving one electron charge transfer and a second rather irreversible step implying two electrons number exchange and yielding to metallic niobium. This last step is perturbed by the formation of niobium subhalide insoluble compounds(cluster). The diffusion coefficients of the Nb(III) and Nb(II) species were found equal to 2.6×10-6 and 3×10-6 cm2 s-1, respectively. According to these values, it was concluded that the diffusive species are complexes rather than simple ones.

Original languageEnglish
Pages (from-to)1559-1565
Number of pages7
JournalElectrochimica Acta
Volume44
Issue number10
DOIs
Publication statusPublished - 1999 Jan

Keywords

  • Chronoamperometry
  • Molten salts
  • Niobium
  • Solubility
  • Voltammetry

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Electrochemistry

Fingerprint Dive into the research topics of 'Examination of niobium electrochemistry from the reduction of Nb<sub>3</sub>Cl<sub>8</sub> in molten LiCl-KCl eutectic'. Together they form a unique fingerprint.

  • Cite this