4.6 Article

The Electrolytic Reduction of MoO3 in CaCl2-NaCl Molten Salt

Journal

JOURNAL OF THE ELECTROCHEMICAL SOCIETY
Volume 169, Issue 8, Pages -

Publisher

ELECTROCHEMICAL SOC INC
DOI: 10.1149/1945-7111/ac87d2

Keywords

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Funding

  1. Natural Science Foundation of Shanghai [22ZR1474700]
  2. Shanghai Pilot Program for Basic Research - Chinese Academy of Science, Shanghai Branch [JCYJ-SHFY-2021-003]
  3. Shanghai Sailing Program [19YF1458200]
  4. National Natural Science Foundation of China [22006150]

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In this study, the electrochemical behavior of MoO3 in the CaCl2-NaCl melt was investigated using various electrochemical techniques, revealing that MoO3 can be transformed into intermediate compounds and finally reduced to metallic Mo through electrolytic reduction.
Electro-deoxidation reduction technology is a very attractive method used to treat oxides in metallurgical industry. In this paper, cyclic voltammetry, square wave voltammetry and open circuit chronopotentiometry were applied to study the electrochemical behavior of MoO3 cathode in the CaCl2-NaCl melt at 873 K. Through the electrolytic reduction of MoO3 at different potentials (-1.15 V, -1.45 V and -1.75 V, vs Ag/AgCl) and XRD analysis, MoO3 was found to be transformed into several intermediate compounds (CaMoO4, MoO2 and Na1.4Mo2O4) and finally reduced to metallic Mo. When the electrolysis time was increased from 3 to 18.5 h and the employed potential was reduced from -1.75 V to -2.30 V (vs Ag/AgCl), the intermediate compounds could be completely reduced to metallic Mo, and the reduction ratio of MoO3 was calculated to be 93.7%.

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