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Sökning: WFRF:(Gloter Alexandre)

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1.
  • Ismail, Ahmed S. M., et al. (författare)
  • Atomic-Scale Investigation of the Structural and Electronic Properties of Cobalt-Iron Bimetallic Fischer-Tropsch Catalysts
  • 2019
  • Ingår i: ACS Catalysis. - : American Chemical Society (ACS). - 2155-5435. ; 9:9, s. 7998-8011
  • Tidskriftsartikel (refereegranskat)abstract
    • Supported cobalt and iron catalysts are important for many catalytic processes. It is believed that combining both elements in a bimetallic catalyst would result in a synergetic catalytic activity during Fischer-Tropsch Synthesis. However, the nature of the interaction between the two elements and its effect on their catalytic properties are not well understood. In the present work, we report the synthesis of carbon-nanotube-supported Co-Fe alloy catalysts using colloidal chemistry methods. The ratios of Co-Fe and their homogeneous distribution in the supported nanoparticles were confirmed using local and bulk characterization techniques. We observed the formation of Co-Fe Janus-like alloy structure and a change of their elemental distribution at the nanoparticle scale upon reduction. The bimetallic catalyst showed reasonable Fischer-Tropsch catalytic activity and selectivity to C5+ hydrocarbons when compared with monometallic iron and cobalt catalysts. Finally, we found that the active phase of the Co-Fe bimetallic species during catalysis depends on the catalytic conditions.
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2.
  • Marinova, Maya, et al. (författare)
  • Depth Profiling Charge Accumulation from a Ferroelectric into a Doped Mott Insulator
  • 2015
  • Ingår i: Nano letters (Print). - : American Chemical Society (ACS). - 1530-6984 .- 1530-6992. ; 15:4, s. 2533-2541
  • Tidskriftsartikel (refereegranskat)abstract
    • The electric field control of functional properties is a crucial goal in oxide-based electronics. Nonvolatile switching between different resistivity or magnetic states in an oxide channel can be achieved through charge accumulation or depletion from an adjacent ferroelectric. However, the way in which charge distributes near the interface between the ferroelectric and the oxide remains poorly known, which limits our understanding of such switching effects. Here, we use a first-of-a-kind combination of scanning transmission electron microscopy with electron energy loss spectroscopy, near-total-reflection hard X-ray photoemission spectroscopy, and ab initio theory to address this issue. We achieve a direct, quantitative, atomic-scale characterization of the polarization-induced charge density changes at the interface between the ferroelectric BiFeO3 and the doped Mott insulator Ca1-xCexMnO3, thus providing insight on how interface-engineering can enhance these switching effects.
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