Aluminium oxidation at high anodic potentials in an AlCl₃-containing air- and water-stable ionic liquid solution

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• 作者：Jean-Pierre M. Veder ; Michael D. Horne ; Thomas R眉ther ; Alan M. Bond ; Theo Rodopoulos
• 关键词：Aluminium ; Oxidation ; Corrosion ; Voltammetry ; Ionic liquid ; Electrodeposition
• 刊名：Electrochemistry Communications
• 出版年：December, 2013
• 年：2013
• 卷：37
• 期：Complete
• 页码：68-70
• 全文大小：284 K

文摘

The observation of a multi-step stripping process at high positive potentials is reported for aluminium electrodeposition from a solution of AlCl₃ in the air- and water-stable ionic liquid 1-butyl-1-methylpyrrolidinium bis(trifluoromethylsulfonyl)imide. Cyclic voltammograms recorded on an aluminium-coated boron-doped diamond electrode revealed complex oxidative behaviour, suggesting that a passive layer forms on the freshly deposited aluminium that hinders electro-oxidation. High positive potentials are required to induce chloride attack of the passive film, composed of Al-NTf₂ compounds, and facilitate the rapid oxidation of the underlying aluminium metal. These results have important implications in bipolar-pulse electroplating and electrorefining applications where electrodissolution of aluminium is required.