Citation: PEI Qi-Fei, HUA Yi-Xin, XU Cun-Ying, ZHANG Qi-Bo, LI Yan, RU Juan-Jian, NG Kai. Dissolution Process of an Aluminum Anode in Acidic AlCl₃-BMIC Ionic Liquid[J]. Acta Physico-Chimica Sinica, ;2013, 29(05): 946-952. doi: 10.3866/PKU.WHXB201302261 shu

Dissolution Process of an Aluminum Anode in Acidic AlCl₃-BMIC Ionic Liquid

1.
Faculty of Metallurgical and Energy Engineering, Kunming University of Science and Technology, Kunming 650093, Yunnan Province, P. R. China

Received Date: 19 November 2012
Available Online: 26 February 2013
Fund Project: 国家自然科学基金(51204080, 51274108, 21263007) (51204080, 51274108, 21263007) 云南省自然科学基金(2011FA009) (2011FA009) 云南省应用基础研究基金(2011FZ020) (2011FZ020)昆明理工大学人才培养项目(14118441)资助 (14118441)

The dissolution process of an aluminum electrode in Lewis acidic ionic liquid aluminum chloride (AlCl₃)-1-butyl-3-methylimidazolium chloride (BMIC) was studied using linear sweep voltammetry. Passivation was observed upon anodic polarization of the aluminum electrode that was caused by formation of a solid AlCl₃ layer on the surface of the aluminum electrode. The electrochemical dissolution process of aluminum can be divided into electrochemically-controlled, transition, and passivation regimes. In the electrochemically-controlled regime, the dissolution rate of aluminum increased with increasing potential. In the transition regime, the dissolution rate of aluminum decreased as the potential increased because of the formation of solid AlCl₃ caused by changes in the concentration of AlCl₄^- and Al₂Cl₇^-. After a passivation layer formed, the dissolution rate of aluminum depended on the diffusion of AlCl₄^- was independent of potential; that is, the electrochemical dissolution process entered the passivation regime. The anodic limiting current density increased with agitation, increasing temperature, and decreasing mole fraction of AlCl₃ in the ionic liquid.
- Aluminum,
- Anodic dissolution,
- AlCl₃-BMIC ionic liquid,
- Passivation phenomenon,
- AlCl₃ layer
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沈阳化工大学材料科学与工程学院沈阳 110142

Dissolution Process of an Aluminum Anode in Acidic AlCl3-BMIC Ionic Liquid

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通讯作者: 陈斌, bchen63@163.com

Dissolution Process of an Aluminum Anode in Acidic AlCl₃-BMIC Ionic Liquid