کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
46588 | 46442 | 2011 | 8 صفحه PDF | دانلود رایگان |
![عکس صفحه اول مقاله: Catalytic activity of dendrimer encapsulated Pt nanoparticles anchored onto carbon towards oxygen reduction reaction in polymer electrolyte fuel cells Catalytic activity of dendrimer encapsulated Pt nanoparticles anchored onto carbon towards oxygen reduction reaction in polymer electrolyte fuel cells](/preview/png/46588.png)
Pt nanoparticles are encapsulated in the fourth-generation hydroxyl-terminated poly (amidoamine) (PAMAM) dendrimer (G4-OH) and anchored onto carbon to realize a novel cathode catalyst for polymer electrolyte fuel cells (PEFCs). Extensive physical and electrochemical characterizations confirm that Pt/G4-OH-C catalyst exhibits significant enhancement of catalytic activity towards oxygen reduction reaction (ORR). The mass activities (A mgPt−1) at 0.9 V vs. RHE for Pt/G4-OH-CI and Pt/G4-OH-CII, both prepared by different routes, are enhanced by 3.6 and 2.6 times, respectively, in relation to Pt/C catalyst. Dendrimer template studied here provides size-controlled preparation of Pt-based catalyst and facilitates uniform dispersion and loading of the catalyst onto carbon support. It is noteworthy that a PEFC comprising Pt/G4-OH-C catalyst with a Pt loading of ∼0.1 mg cm−2 delivers a power density of 712 mW cm−2 at 0.6 V with H2 and O2 feeds. By contrast, the PEFC using Pt/C with a Pt loading of ∼0.2 mg cm−2 delivers a power density of only 370 mW cm−2 while operating under similar conditions.
Figure optionsDownload as PowerPoint slideHighlights
► Hydroxyl-terminated poly(amidoamine) dendrimer controls Pt nanoparticle formation.
► Lower loading of Pt is accomplished using this dendrimer regulated catalyst.
► High mass activity and uniform dispersion of Pt is achieved with Pt/G4-OH-C.
Journal: Applied Catalysis B: Environmental - Volume 110, 2 November 2011, Pages 178–185