Electrochemistry of Titanium Tetrachloride in 1-Butyl-2,3-dimethyl Imidazolium Tetrafluoroborate

Author:

Andriyko Yuriy1,Fastner Ulrike1,Kronberger Hermann2,Nauer Gerhard E.13

Affiliation:

1. ECHEM Centre of Competence in Applied Electrochemistry, Viktor Kaplan-Straße 2, A-2700 Wiener Neustadt, Austria

2. Vienna University of Technology, Institute of Chemical Technology and Analytics, Getreidemarkt 9/164, A-1060 Wien, Austria

3. Vienna University, Faculty of Chemistry, W¨ahringer Straße 42, A-1090 Wien, Austria

Abstract

The electrochemistry of titanium tetrachloride has been examined in trialkyl-substituted imidazolium tetrafluoroborate at 65 °C. Ti(IV) reduction was studied with chronopotentiometry and cyclic voltammetry in melts with different concentrations of TiCl4. The diffusion coefficient of Ti(IV) ranged between 1.1·10−7 and 7·10−8 cm2 s−1. The electroreduction of Ti(IV) was found to proceed via the sequence of one-electron steps, the relative stability of the low valence intermediates being dependent on the concentration of TiCl4 in the electrolyte. The kinetics of an overlapping disproportionation reaction of Ti(II) was examined and its rate constant at low concentration (0.025 mol/l) of TiCl- was found to be k = 2 · 106 cm3 mol−1 s−1, Ti(0) being the final product of the stepwise reduction process at higher concentrations (0.03 - 0.14 mol/l).

Publisher

Walter de Gruyter GmbH

Subject

Physical and Theoretical Chemistry,General Physics and Astronomy,Mathematical Physics

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