| DOI | Trouver le DOI : https://doi.org/10.1039/c4ta06250g |
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| Auteur | Rechercher : Zhang, Xuefeng1; Rechercher : Guan, Pengfei; Rechercher : Malic, Lidija2; Rechercher : Trudeau, Michel; Rechercher : Rosei, Federico; Rechercher : Veres, Teodor2 |
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| Affiliation | - Conseil national de recherches Canada. Aérospatiale
- Conseil national de recherches Canada. Dispositifs médicaux
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| Format | Texte, Article |
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| Sujet | Catalytic oxidation; Decomposition; Electrooxidation; Energy efficiency; Palladium; Platinum; Catalytic performance; Decomposition strategy; Low coordination; Structure/function relationships; Sustainable materials; Theoretical simulation; Catalyst activity |
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| Résumé | Growing needs for highly efficient energy storage devices have prompted increasing research efforts in energy-efficient and sustainable materials. In this context, nanoporous noble metals have been studied extensively because of their extraordinary properties. However, existing electrochemical/chemical dealloying approaches for their synthesis largely lack the ability to optimize their structure/function relationships. To overcome this limitation, we developed a thermal-decomposition strategy for the synthesis of component-controllable nanoporous PtPd alloys composed of ∼2 nm sawtooth-like ligaments induced by a high density of twinning boundaries (boundary spacing ∼ 1 nm). Such twinned and ultrathin ligaments exhibit large curvatures between concave and convex regions, associated with abundant low-coordination surface atomic steps and kinks. These low-coordination atoms are sites of high catalytic activity, as confirmed by theoretical simulations. The optimized Pt25Pd75 sample exhibits the best catalytic performance among all the currently reported catalysts, and has a mass activity of 1110 mA mg-1Pt-1 and high stability for the electro-oxidation of methanol. |
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| Date de publication | 2015-02-07 |
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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 NPARC | 21275760 |
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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 | e29d7dd7-5c99-4212-a434-06e885d79b70 |
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| Enregistrement créé | 2015-07-14 |
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| Enregistrement modifié | 2020-04-22 |
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