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Boosting Oxygen Reduction Reaction Selectivity in Metal Nanoparticles with Polyoxometalates.

Eugenia Pilar Quirós-Díez1, Carlos Herreros-Lucas1, José Manuel Vila-Fungueiriño2

  • 1Centro Singular de Investigación en Química Biolóxica e Materiais Moleculares (CiQUS), Departamento de Química Inorgánica, Universidade de Santiago de Compostela, Santiago de Compostela, 15782, Spain.

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|March 22, 2024
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Summary

This study introduces a novel polyoxometalate (POM) capping layer to enhance the selectivity of gold nanoparticles (AuNPs) for the oxygen reduction reaction (ORR). This innovation improves catalyst stability and performance in fuel cells and metal-air batteries.

Keywords:
carbon nanofiberscovalent functionalizationgold nanoparticlesoxygen reduction reactionpolyoxometalatesselectivity

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Area of Science:

  • Electrochemistry
  • Materials Science
  • Nanotechnology

Background:

  • The oxygen reduction reaction (ORR) selectivity in metal nanoparticles is limited by intermediate generation, impacting fuel cells and metal-air batteries.
  • Current catalysts often struggle with stability and performance across various conditions.

Purpose of the Study:

  • To develop a novel method for enhancing the ORR selectivity of metal nanoparticles.
  • To introduce a polyoxometalate (POM)-based electrochemically active capping layer for improved catalyst performance and stability.

Main Methods:

  • Covalent functionalization of gold nanoparticles (AuNPs) with a sulfur-functionalized vanadium-based POM (AuNP@POM).
  • Dispersion of AuNP@POM onto carbon nanofibers (CNF) to create the AuNP@POM/CNF electrocatalyst.
  • Evaluation of the electrocatalyst's ORR activity, selectivity, stability, and pH tolerance.

Main Results:

  • The AuNP@POM/CNF electrocatalyst demonstrated enhanced ORR activity due to improved oxygen diffusion.
  • The catalyst exhibited superior stability against methanol impurities and a wider pH tolerance range compared to commercial Pt/C.
  • The POM capping layer effectively scavenged undesired ORR intermediates, boosting selectivity.

Conclusions:

  • This work presents the first use of a POM-based electrochemically active capping layer to significantly improve the selectivity of gold nanoparticles for the ORR.
  • The developed AuNP@POM/CNF catalyst offers a promising alternative for ORR-based devices, showing enhanced selectivity, performance, and stability.