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Formic acid electrooxidation on Bi-modified polyoriented and preferential (111) Pt nanoparticles.

Ana López-Cudero1, Francisco J Vidal-Iglesias, José Solla-Gullón

  • 1Instituto de Electroquímica, Universidad de Alicante, Apartado, 99, 03080 Alicante, Spain.

Physical Chemistry Chemical Physics : PCCP
|December 18, 2008
PubMed
Summary

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Bismuth modification enhances formic acid electrooxidation on platinum nanoparticles. Preferential (111) facets show higher peak currents, but both nanoparticle types exhibit similar sustained currents and reduced CO poisoning.

Area of Science:

  • Electrochemistry
  • Materials Science
  • Nanotechnology

Background:

  • Formic acid electrooxidation is crucial for fuel cells.
  • Platinum nanoparticles are effective catalysts but prone to CO poisoning.
  • Bismuth modification is explored to enhance catalyst performance.

Purpose of the Study:

  • To investigate the effect of bismuth (Bi) on formic acid electrooxidation on polyoriented and preferential (111) platinum (Pt) nanoparticles.
  • To compare the performance of Bi-modified Pt nanoparticles with bare Pt nanoparticles.
  • To understand how surface structure, particle size, and Bi coverage influence electrochemical activity and CO poisoning.

Main Methods:

  • Cyclic voltammetry and chronoamperometric measurements were employed.
  • Bismuth coverage was systematically increased on both polyoriented and preferential (111) Pt nanoparticles.

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  • Carbon monoxide (CO) poisoning was evaluated at open circuit potential.

    • Main Results:

    • Bismuth modification significantly enhanced electrooxidation current densities for both nanoparticle types compared to bare Pt.
    • Preferential (111) Pt nanoparticles exhibited higher peak current densities at maximum Bi coverage in voltammetry.
    • Similar sustained current densities were observed for both nanoparticle types in chronoamperometry at 0.4 V.
    • CO poisoning was evaluated, indicating potential mitigation strategies.

    Conclusions:

    • Bismuth modification is an effective strategy to improve formic acid electrooxidation on Pt nanoparticles.
    • The surface structure, particularly the (111) facet, plays a role in peak electrocatalytic activity.
    • Further investigation into parameters like particle size and domain size is needed for complete rationalization of electrochemical activity.