Kottakkat, T. and Sahu, A.K. and Bhat, S.D. and Pitchumani, S. and Sridhar, P. (2011) Catalytic activity of dendrimer encapsulated Pt nanoparticles anchored onto carbon towards oxygen reduction reaction in polymer electrolyte fuel cells. Applied Catalysis B: Environmental, 110. pp. 178-185. ISSN 0926-3373

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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

Item Type: Article
Uncontrolled Keywords: PAMAM dendrimers; Pt nano-catalyst; Oxygen reduction reaction; PEFCs
Subjects: Fuel Cells
Electrochemical Power Sources
Depositing User: ttbdu cecri
Date Deposited: 19 Nov 2012 05:44
Last Modified: 19 Nov 2012 05:44
URI: http://cecri.csircentral.net/id/eprint/2884

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