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Dynamic electrocatalyst with current-driven oxyhydroxide shell for rechargeable zinc-air battery.

Ya-Ping Deng1, Yi Jiang1, Ruilin Liang1

  • 1Department of Chemical Engineering, Waterloo Institute for Nanotechnology, Waterloo Institute for Sustainable Energy, University of Waterloo, Waterloo, ON, N2L 3G1, Canada.

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Researchers propose a "dynamic electrocatalyst" concept for rechargeable zinc-air batteries. This reveals a nanoscale oxyhydroxide shell formation, significantly boosting battery performance and stability for practical applications.

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Energy Storage

Background:

  • Rechargeable zinc-air batteries utilize bifunctional oxygen electrocatalysts, often metal-based.
  • The electrocatalytic configuration and evolution during battery operation are poorly understood.

Purpose of the Study:

  • To introduce the concept of a 'dynamic electrocatalyst' to explain catalyst behavior.
  • To visualize the in-situ configuration and evolution pathway of metal-based electrocatalysts.

Main Methods:

  • Utilized time-resolved X-ray and electron spectroscopy analyses.
  • Investigated a bimetal nitride as a representative dynamic electrocatalyst.

Main Results:

  • Visualized a current-driven 'shell-bulk' configuration with nanoscale oxyhydroxide shell generation and maturation.
  • Observed periodic valence swings of the performance-dominant element.
  • Achieved a two-fold power density increase (234 mW cm⁻²), narrowed voltage gap (0.85 V at 30 mA cm⁻²), and stable cycling (> hundreds of hours).

Conclusions:

  • The dynamic electrocatalyst concept provides insights into catalyst evolution during zinc-air battery operation.
  • Understanding this configuration is crucial for designing advanced metal-based electrocatalysts.
  • This work advances the practical application of rechargeable zinc-air batteries.