CONDUCTIVITY AND ELECTROCHEMISTRY OF COBALT (II) AND DYSPROSIUM CHLORIDE IN ZINC CHLORIDE-1-ETHYL-3-METHYL- IM1DAZOLIUM CHLORIDE ROOM TEMPERATURE MOLTEN SALT

摘要

In this present study, zinc chloride-1-ethyl-3-methylimidazolium chloride (EMIC) was used to form a room temperature melt. Although these melts are being examined for electrochemical applications, little conductivity data appears in the literature. The sequence of conductivities for the different component melts is ZnCl_2-EMIC > ZnCl_2-EMIC-CoCl_2 > ZnCl_2-EMIC-DyCl_3 > ZnCl_2-EMIC-CoCl_2-DyCl_3. The results may be explained in terms of the viscosity increase and complex formation when the cobalt chloride or dysprosium chloride is added into the acidic ZnCl_2-EMIC melt. The electrochemistry of cobalt(Ⅱ) and/or dysprosium chloride in acidic ZnCl_2-EMIC melts at different temperature has been investigated by cyclic voltammetry. The results reveal the reduction of Dy(Ⅲ) to Dy(Ⅱ) or Dy(Ⅲ) to Dy may have occurred, and the electrodeposition of Co-Dy or Zn-Co-Dy alloys was not formed from the melt at 80℃. Nevertheless, the cathodic reduction of Co~(2+)/Dy~(3+) species will occur more readily at 110℃ and 120℃ than at 100℃.