|About this Abstract
||2018 TMS Annual Meeting & Exhibition
||Rare Metal Extraction & Processing
||Electrochemical Reduction of Nickel Tetrafluoroborate in 2:1 Urea-choline Chloride Ionic Liquids
||Liu Aimin, Zhongning Shi, Ramana Reddy
|On-Site Speaker (Planned)
Nickel tetrafluoroborate (Ni(BF4)2) was electrochemically reduced to metallic Ni in 2:1 mole ratio of urea/choline chloride (urea-ChCl) ionic liquids. The electrochemical behavior of Ni(II) in the urea-ChCl-Ni(BF4)2 ionic liquids was studied by cyclic voltammetry and chronopotentiometry at 373 K using a tungsten working electrode and silver reference electrode. The results from cyclic voltammograms and chronopotentiograms indicate that the reduction of Ni(II) to metallic Ni is an apparent two-electron transfer process on tungsten working electrode. Moreover, the nucleation mechanism of Ni as well as the diffusion coefficient of Ni(II) were investigated by chronoamperometry. On the other hand, Ni coatings were prepared on copper substrates by constant potential electrolysis. SEM micrograph indicated that a uniform, dense, and compact coating was produced. In addition, XRD pattern and EDS spectrum confirmed that the obtained deposits on the Cu substrate was metallic Ni.