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Refining anodic and cathodic dissolution mechanisms: combined AESEC-EIS applied to Al-Zn pure phase in alkaline solution

Authors
  • Han, Junsoo1, 2
  • Vivier, Vincent3
  • Ogle, Kevin1
  • 1 Chimie ParisTech, PSL Research University, CNRS, Institut de Recherche Chimie Paris (IRCP), Paris, F-75005, France , Paris (France)
  • 2 Department of Materials Science and Engineering, University of Virginia, Charlottesville, VA, 22904, United States , Charlottesville (United States)
  • 3 Sorbonne Université, CNRS, Laboratoire Interfaces et Systèmes Electrochimiques, LISE, Paris, F-75005, France , Paris (France)
Type
Published Article
Journal
npj Materials Degradation
Publisher
Nature Publishing Group UK
Publication Date
Jul 15, 2020
Volume
4
Issue
1
Identifiers
DOI: 10.1038/s41529-020-0123-0
Source
Springer Nature
License
Green

Abstract

In this work, the use of atomic emission spectroelectrochemistry (AESEC) coupled to electrochemical impedance spectroscopy (EIS) is presented as a method of revealing dissolution mechanisms. To illustrate the method, the dissolution kinetics of Al cations from an Al-Zn pure phase (Zn-68 wt.% Al) was investigated in an alkaline solution. In the cathodic potential domain, a nearly direct formation of dissolved Al3+ was observed, while in the anodic potential domain the Al dissolution occurred by migration across a ZnO/Zn(OH)2 film. It was demonstrated that this methodology can be applied to a nonstationary system during a potentiostatic experiment for a lower Al content phase (Zn-22 wt.% Al). The nature of the charge transfer mechanisms depended on the applied potential and could be identified by comparing the direct current and alternating current faradaic yield using AESEC-EIS.

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