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Electrochemistry of TiF4 in 1-butyl-2,3-dimethylimidazolium tetrafluoroborate |
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| Authors: | Yuriy Andriyko Alexander Andriiko Gerhard E Nauer |
| Affiliation: | a Centre of Electrochemical Surface Technology (CEST), Viktor Kaplan-Straße 2, A-2700 Wiener Neustadt, Austria b National Technical University of Ukraine “Kyiv Polytechnic Institute”, Prospect Peremogy 37, 03057 Kyiv, Ukraine c Vienna University, Faculty of Chemistry, Währinger Straße 42, A-1090 Wien, Austria |
| Abstract: | Electrochemical behaviour of Ti(IV) species in the ionic liquid (IL) 1-butyl-2,3-dimethylimidazolium tetrafluoroborate (BMMImBF4) was studied by means of chronopotentiometry (CP) and cyclic voltammetry (CV) in melts with different concentrations of TiF4 (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 one-electron 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 2BF4− + TiF4 ⇔ TiF62− + 2BF3↑ takes place in the concentrated solutions of TiF4 at elevated temperatures. |
| Keywords: | Titanium Electrochemistry Electrodeposition Ionic liquids FTIR spectra |
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