| Téléchargement | - Voir le manuscrit accepté : Formic acid electro-oxidation on carbon supported PdxPt1-x (0 ≥ x ≥ 1) nanoparticles synthesized via modified polyol method (PDF, 823 Kio)
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| DOI | Trouver le DOI : https://doi.org/10.1016/j.electacta.2009.12.090 |
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| Auteur | Rechercher : Baranova, Elena A.; Rechercher : Miles, Neil; Rechercher : Mercier, Patrick H. J.1; Rechercher : Le Page, Yvon1; Rechercher : Patarachao, Bussaraporn1 |
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| Affiliation | - Conseil national de recherches du Canada. Institut de technologie des procédés chimiques et de l'environnement du CNRC
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| Format | Texte, Article |
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| Sujet | Bimetallic nanoparticles; PdPt; Formic acid; Direct formic acid fuel cells; Electrocatalyst |
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| Résumé | Carbon supported nanoparticle catalysts of PdxPt1−x (0≥x≥1) were synthesized using a modified polyol method and poly(N-vinyl-2-pyrrolidone) (PVP) as a stabilizer. Resulting nanoparticles were characterized by X-ray photoelectron spectroscopy (XPS), cyclic voltammetry (CV) and chronoamperommetry (CA) study for formic acid electro-oxidation. Surface composition of the synthesized nanoparticles found from XPS revealed the Pt surface segregation even for the Pd-rich compositions. It is suggested that the surface segregation behavior in PdPt nanoparticles supported on carbon may be influenced, in addition to the difference in Pd and Pt surface energies, by particle size and particle interaction with the support. According to CA, the carbon supported Pd nanoparticles show the highest initial activity towards formic acid electro-oxidation at the potential of 0.3V (RHE), due to the promotion of the direct dehydrogenation mechanism. However its stability is quite poor resulting in the fast deactivation of the Pd surface. Addition of Pt considerably improves the steady-state activity of Pd in 12 h CA experiment. CA measurements show that the most active catalyst is Pd0.5Pt0.5 of 4 nm size, which displays narrow size distribution and Pd to Pt surface atomic ratio of 27–73. |
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| Date de publication | 2010-01-11 |
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| Dans | |
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| Langue | anglais |
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| Publications évaluées par des pairs | Oui |
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| Numéro du CNRC | NRCC 52088 |
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| Numéro NPARC | 17733594 |
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| Exporter la notice | Exporter en format RIS |
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| Signaler une correction | Signaler une correction (s'ouvre dans un nouvel onglet) |
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| Identificateur de l’enregistrement | 22c939db-33df-497b-a853-806abb9a2e78 |
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| Enregistrement créé | 2011-04-12 |
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| Enregistrement modifié | 2020-04-17 |
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