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Overcoming passivation through improved mass transport in dense ionic fluids.

Evangelia Daskalopoulou1, Philip Hunt1, Christopher E Elgar1

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Summary
This summary is machine-generated.

Deep Eutectic Solvents (DESs) and brines offer unique charge transport properties. Ultrasound enhances metal dissolution, overcoming passivation issues in specific ionic fluids for selective metal processing.

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Area of Science:

  • Electrochemistry
  • Materials Science
  • Physical Chemistry

Background:

  • Deep Eutectic Solvents (DESs) bridge ionic liquids and concentrated brines.
  • Charge transport in these fluids correlates with fluidity.
  • Water and chloride ion activity influence mass transport, speciation, and reactivity.

Purpose of the Study:

  • Investigate the role of ultrasound in metal anodic dissolution within DESs and brines.
  • Determine if ultrasound can overcome metal passivation in these media.
  • Explore selective metal processing using controlled passivation.

Main Methods:

  • Anodic dissolution experiments on various metal electrodes (Cu, Co, Al, Ag, Ni).
  • Application of high-powered ultrasound during linear sweep voltammetry.
  • Analysis of current-voltage responses and total charge passed.

Main Results:

  • Ultrasound significantly increased charge passed (5-134x) for Cu, Co, and Al, showing linear current-voltage responses.
  • Brines with high water content led to passivation for Ag and Ni, despite initial linear responses.
  • Ultrasound-induced forced convection governs mass transport, reducing migration distances.

Conclusions:

  • Ultrasound can accelerate the anodic dissolution of metals, even those prone to passivation like aluminum.
  • The water content in brines can lead to selective passivation, offering control in mixed metal processing.
  • DESs and brines, combined with ultrasound, present tunable electrochemical media for materials processing.