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Article Dans Une Revue Materials Chemistry and Physics Année : 2022

One-pot synthesis of carbon-supported AuCo and AuNi nanoalloys for the oxygen reduction reaction in alkaline media

Francisco Acosta-Arreazola
  • Fonction : Auteur
Nora A Garcia-Gomez
  • Fonction : Auteur
Marian Chatenet
Israel López
  • Fonction : Auteur
Eduardo M Sánchez
  • Fonction : Auteur

Résumé

Carbon-supported bimetallic AuCo and AuNi electrocatalysts were prepared from one-pot wet-chemistry techniques (ethylene glycol-stabilization and aqueous-solution stirring) and evaluated for the oxygen reduction reaction (ORR) in alkaline media. All the materials consist of near-spherical nanoparticles that show varying sizes and extent of agglomeration. While the ethylene-glycol method produced less agglomerated particles, the stirring method produced smaller ones. X-Ray photoelectron (XPS) analyses demonstrated the change in the binding energies of Au 4f5/5 and Au 4f7/2 versus the expected values for pure gold, pointing at the formation of alloyed nanoparticles. The combination of such electronic effects and morphology led the AuNi/C-EG nanoalloy to a good compromise between materials cost (versus Au/C) and ORR activity: the onset potential and half-wave potential for the oxygen reduction reaction are 0.833 and 0.600 V vs. RHE, respectively, corresponding to a specific activity 10% greater than that for Au/C at 0.85 V vs. RHE. The carbon-supported AuNi nanoalloy possesses undoubtable potential to be used as an electrocatalyst for the electroreduction of oxygen in alkaline environments.
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Dates et versions

hal-03494472 , version 1 (19-12-2021)

Identifiants

Citer

Francisco Acosta-Arreazola, Nora A Garcia-Gomez, Marian Chatenet, Vincent Martin, Israel López, et al.. One-pot synthesis of carbon-supported AuCo and AuNi nanoalloys for the oxygen reduction reaction in alkaline media. Materials Chemistry and Physics, 2022, 278, pp.125605. ⟨10.1016/j.matchemphys.2021.125605⟩. ⟨hal-03494472⟩
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