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Sökning: WFRF:(Cheon Jae Yeong)

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  • Cheon, Jae Yeong, et al. (författare)
  • Ordered mesoporous porphyrinic carbons with very high electrocatalytic activity for the oxygen reduction reaction
  • 2013
  • Ingår i: Scientific Reports. - : Springer Science and Business Media LLC. - 2045-2322. ; 3, s. 2715-
  • Tidskriftsartikel (refereegranskat)abstract
    • The high cost of the platinum-based cathode catalysts for the oxygen reduction reaction (ORR) has impeded the widespread application of polymer electrolyte fuel cells. We report on a new family of non-precious metal catalysts based on ordered mesoporous porphyrinic carbons (M-OMPC; M = Fe, Co, or FeCo) with high surface areas and tunable pore structures, which were prepared by nanocasting mesoporous silica templates with metalloporphyrin precursors. The FeCo-OMPC catalyst exhibited an excellent ORR activity in an acidic medium, higher than other non-precious metal catalysts. It showed higher kinetic current at 0.9 V than Pt/C catalysts, as well as superior long-term durability and MeOH-tolerance. Density functional theory calculations in combination with extended X-ray absorption fine structure analysis revealed a weakening of the interaction between oxygen atom and FeCo-OMPC compared to Pt/C. This effect and high surface area of FeCo-OMPC appear responsible for its significantly high ORR activity.
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3.
  • Reddy, A. Satyanarayana, et al. (författare)
  • Ultrathin titania coating for high-temperature stable SiO(2)/Pt nanocatalysts
  • 2011
  • Ingår i: Chemical Communications. - : Royal Society of Chemistry (RSC). - 1359-7345 .- 1364-548X. ; 47, s. 8412-8414
  • Tidskriftsartikel (refereegranskat)abstract
    • The facile synthesis of silica supported platinum nanoparticles with ultrathin titania coating to enhance metal-support interactions suitable for high temperature reactions is reported, as thermal and structure stability of metal nanoparticles is important for catalytic reactions.
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  • Resultat 1-3 av 3

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