ISSN:
0013-4686
Content:
The density, electrical conductivity and diffusion coefficients of anions and cations in the ionic liquid AlCl3/1-ethyl-3-methylimidazolium chloride, [EMIm]Cl, were determined to study physical correlations of these important parameters. The density was measured for different molar ratios of AlCl3:[EMIm]Cl from 0.5:1 to 2.0:1 at ambient temperature. The diffusion coefficient of the electrochemically active heptachloroaluminate complex, Al2Cl7-, was measured for a molar ratio of 2:1 in the range of 25°C to 100°C. The corresponding current density and potential transients were discussed regarding the decomposition of the [EMIm]+ cation and deviation from the theoretical Cottrell behavior. The electrical conductivity was measured for molar ratios of 1.5:1 and 2:1 in the range of 25°C to 100°C. Both the diffusion coefficient and electrical conductivity can be described well by an Arrhenius law. The diffusion coefficients of AlCl4-, Al2Cl7- and [EMIm]+ were estimated from the Nernst-Einstein and Stokes-Einstein relation. The results indicate a strong impact of ion pairing in these electrolytes.
In:
Electrochimica acta, Kidlington : Elsevier Science, 1959, Volume 366 (2021), 137370, 0013-4686
In:
volume:366
In:
year:2021
In:
day:10
In:
month:01
In:
pages:137370
Language:
English
DOI:
10.1016/j.electacta.2020.137370
Author information:
Ispas, Adriana 1977-
Author information:
Bund, Andreas 1969-
Author information:
Böttcher, René