Electrochemistry of TiF4 in 1-butyl-2,3-dimethylimidazolium tetrafluoroborate

✍ Scribed by Yuriy Andriyko; Alexander Andriiko; Olga B. Babushkina; Gerhard E. Nauer

• Publisher: Elsevier Science
• Year: 2010
• Tongue: English
• Weight: 671 KB
• Volume: 55
• Category: Article
• ISSN: 0013-4686
• DOI: 10.1016/j.electacta.2009.09.075

✦ Synopsis

Electrochemical behaviour of Ti(IV) species in the ionic liquid (IL) 1-butyl-2,3-dimethylimidazolium tetrafluoroborate (BMMImBF 4 ) was studied by means of chronopotentiometry (CP) and cyclic voltammetry (CV) in melts with different concentrations of TiF 4 (2-35 mol%) within a temperature range of 65-180 • C. The electrochemical reduction of Ti(IV) was suggested to proceed via the sequence of oneelectron steps with the formation of poorly soluble low valence intermediates (LVI). LVIs undergo further solid-state electrochemical reduction to Ti metal. Thin Ti coatings on a Pt substrate were thus obtained and characterized by ESEM method. FTIR spectroscopy was used for identification of the electrochemical active species of Ti(IV). The reaction 2BF 4 -+ TiF 4 ⇔ TiF 6 2-+ 2BF 3 ↑ takes place in the concentrated solutions of TiF 4 at elevated temperatures.