Electrolytic Deposition Behavior of Mo in Molten NaCl-KCl-Li2MoO4.

概要

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The electrolytic deposition behavior of Mo in molten salt has been studied using the equimolar NaCl-KCl molten salt, which contains Li2MoO4 as a molybdenum source. In the equimolar NaCl-KCl molten salt containing only Li2MoO4, a high cathodic current corresponding to the reduction reaction of Li2MoO4 was observed under cathodic polarization. Under this polarization, the deposition of Mo could not be observed, but the deposition of Li2Mo2O5 which grew perpendicular to the substrate surface was observed. On the other hand, in the equimolar NaCl-KCl molten salt containing B2O3, AlF3 or K2SiF6 as the second addition agents in addition to the Li2MoO4, a higher cathodic current was observed under cathodic polarization, showing that the cathodic reaction was more active. Under the cathodic polarization in the molten salt containing B2O3 or AlF3 as the second addition agent, the deposition of MoO2 occurred without depending on the polarization potential. On the contrary, under the cathodic polarization in the molten salt containing K2SiF6 as the second addition agent the deposition material was changed with the polarization potential. Thus, in the molten salt containing K2SiF6, MoO2 was deposited at high potentials, while Mo was deposited at low potentials. Consequently, it was found that in the equimolar NaCl-KCl molten salt containing Li2MoO4 and K2SiF6, Mo was deposited under the cathodic polarization at low potential.
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