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Article Navigation >  Green Energy&Environment  > 2017  >  2(4): 412-418
Dongpeng Xue, Yang Yang, Guoping Ling. The passivation mechanism of Fe in the acidic AlCl3-EMIC ionic liquid. Green Energy&Environment, 2017, 2(4): 412-418. doi: 10.1016/j.gee.2017.08.003
Citation: Dongpeng Xue, Yang Yang, Guoping Ling. The passivation mechanism of Fe in the acidic AlCl3-EMIC ionic liquid. Green Energy&Environment, 2017, 2(4): 412-418. doi: 10.1016/j.gee.2017.08.003
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The passivation mechanism of Fe in the acidic AlCl3-EMIC ionic liquid

doi: 10.1016/j.gee.2017.08.003

  • School of Materials Science and Engineering, Zhejiang University, Hangzhou 310027, China

More Information
  • Corresponding author: E-mail address: linggp@zju.edu.cn (Guoping Ling)
  • Received date 09 March 2017, Accepted date 22 August 2017, RevRecd date 18 August 2017, Available online 05 September 2017, Publish date 31 October 2017,
    Abstract
  • The passivation behavior of Fe in the acidic AlCl3-1-ethyl-3-methyl-imidazolium chloride (AlCl3-EMIC) ionic liquid was studied by linear sweep voltammetry and chonopotentiometry. Various approaches were used to characterize the composition and morphology of passive film formed on the Fe electrode, such as scanning electron microscopy (SEM), Raman spectra and X-ray Photoelectron Spectroscopy (XPS). The results showed that the critical passivation potential of Fe shifted to more negative when the molar ratio of AlCl3:EMIC changing from 2 to 1.3. A film with a light yellow color was observed on the surface of the Fe electrode after passivation. The composition of the passive film was demonstrated to be FeCl2. The passive film was composed of particulate FeCl2 with average diameter of about 500 nm. The formation of FeCl2 film was attributed to the variation of the electrolyte Lewis acidity from acidic to neutral at the interface during the dissolution process of Fe. The reason caused the variation of the electrolyte acidity was discussed.

     

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