@Article{dbt_mods_00047889,
  author = 	{B{\"o}ttcher, Ren{\'e}
		and Mai, Sebastian
		and Ispas, Adriana
		and Bund, Andreas},
  title = 	{Aluminum deposition and dissolution in [EMIm]Cl-based ionic liquids-kinetics of charge-transfer and the rate-determining step},
  journal = 	{Journal of the Electrochemical Society: JES},
  year = 	{2020},
  month = 	{Jun},
  day = 	{29},
  publisher = 	{Electrochemical Soc},
  address = 	{Pennington, NJ},
  volume = 	{167, 2020},
  number = 	{10},
  pages = 	{art. 102516},
  abstract = 	{The kinetics of the dissolution and deposition of aluminum from a first generation ionic liquid consisting of AlCl3/1-ethyl-3-methylimidazolium chloride (molar ratio 2:1) was studied. Electrochemical impedance spectroscopy shows that the double layer capacitance and the charge--transfer resistance depend on the state of the electrode surface. The impedance spectra are strongly influenced by mass transport. The rate--determining step of the aluminum deposition, as determined from the cathodic Tafel slope evaluated from current step experiments, was found to be either a chemical step, releasing the complexing agent chloride, while aluminum is in the divalent oxidation state (AlCl3− {\textrightarrow} AlCl2 + Cl−) or an electron transfer from the divalent to the monovalent aluminum occurring twice for the overall reaction to occur once (Al2+ + e− {\textrightarrow} Al+). The rate--determining step for aluminum dissolution was found to be the transfer of an electron from elemental aluminum to the monovalent oxidation state (Al0 {\textrightarrow} Al+ + e−). A linear slope in the low cathodic overpotential region of the Tafel plot suggests a change in the cathodic rate--determining step. The Tafel slope indicates a chemical step, releasing the complexing agent chloride, after the last electron transfer (AlCl− {\textrightarrow} Al0 + Cl−) to be the rate--determining step for overpotentials below 50 mV. Density functional theory calculations support the proposed reduction and oxidation mechanisms.},
  issn = 	{1945-7111},
  doi = 	{10.1149/1945-7111/ab9c84},
  url = 	{https://www.db-thueringen.de/receive/dbt_mods_00047889},
  url = 	{http://uri.gbv.de/document/gvk:ppn:172683087X},
  url = 	{http://uri.gbv.de/document/gvk:ppn:317954725},
  url = 	{https://doi.org/10.1149/1945-7111/ab9c84},
  file = 	{:https://www.db-thueringen.de/servlets/MCRFileNodeServlet/dbt_derivate_00052734/1945-7111_167_2020_10_102516.pdf:PDF},
  language = 	{en}
}