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Selective Catalyst Surface Access through Atomic Layer Deposition.

Samuel S Hardisty1, Shira Frank1, Melina Zysler1

  • 1Department of Chemistry and Bar Ilan Institute of Nanotechnology and Advanced Materials (BINA), Bar Ilan University, Ramat Gan 5290002, Israel.

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Summary

Protecting platinum catalysts with vanadium oxide coatings via atomic layer deposition enhances their durability and performance in green energy applications. This novel approach prevents degradation in harsh electrolytes, improving catalyst longevity.

Keywords:
atomic layer depositionbromineelectrocatalysishydrogenredox flow batteryselectivity

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Catalysis

Background:

  • Catalyst poisoning significantly limits the lifespan and increases the operational costs of catalytic processes.
  • Electrocatalysts crucial for green energy technologies like fuel cells and redox flow batteries are susceptible to poisoning, hindering their widespread adoption.
  • Existing protective strategies often lack selectivity, failing to shield catalysts from detrimental species without impeding essential reactions.

Purpose of the Study:

  • To develop a selective coating method for protecting platinum-based electrocatalysts from degradation.
  • To investigate the efficacy of vanadium oxide (V2O5) coatings applied via atomic layer deposition (ALD) for catalyst protection.
  • To evaluate the impact of V2O5 coating on catalyst performance and stability in corrosive electrolytes.

Main Methods:

  • Atomic layer deposition (ALD) was employed to apply a V2O5 coating onto a standard 50% Pt/C catalyst.
  • Electrochemical characterization techniques, including cyclic voltammetry, were used to assess catalyst activity and stability.
  • X-ray photoelectron spectroscopy (XPS) was utilized to analyze the surface composition and confirm the presence of the protective coating.
  • Catalyst performance was evaluated in a challenging hydrogen bromide/bromine (HBr/Br2) electrolyte.

Main Results:

  • ALD successfully achieved selective V2O5 deposition on the platinum sites of the Pt/C catalyst.
  • The V2O5 coating enhanced hydrogen transport to the platinum surface, leading to increased mass activity in alkaline media.
  • Cyclic voltammetry and XPS confirmed that the V2O5 coating effectively protected the Pt/C catalyst from dissolution in the HBr/Br2 electrolyte.
  • Uncoated Pt/C catalysts degraded within 3 minutes in the HBr/Br2 electrolyte, while the coated catalysts demonstrated significant stability.

Conclusions:

  • Vanadium oxide coatings applied by ALD offer a promising strategy for protecting platinum electrocatalysts against poisoning.
  • The V2O5 coating not only enhances catalyst stability but also improves electrocatalytic performance by facilitating hydrogen transport.
  • This selective protection method holds potential for advancing the durability and application of electrocatalysts in demanding energy conversion and storage systems.