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25 results on '"Stensgaard I I"'

1. Diffusion of N adatoms on the Fe(100) surface

Author

Pedersen MO, Osterlund L, Mortensen JJ, Mavrikakis M, Hansen LB, Stensgaard I I, Laegsgaard E, Norskov JK, and Besenbacher F

Abstract

The diffusion of individual N adatoms on Fe(100) has been studied using scanning tunneling microscopy and ab initio density functional theory (DFT) calculations. The measured diffusion barrier for isolated N adatoms is E(d) = (0.92+/-0.04) eV, with a prefactor of nu(0) = 4.3x10(12) s(-1), which is in quantitative agreement with the DFT calculations. The diffusion is strongly coupled to lattice distortions, and, as a consequence, the presence of other N adatoms introduces an anisotropy in the diffusion. Based on experimentally determined values of the diffusion barriers and adsorbate-adsorbate interactions, the potential energy surface experienced by a N adatom is determined.

Published
2000
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2. Atomic-scale structure of single-layer MoS2 nanoclusters

Author

Helveg S, Lauritsen JV, Laegsgaard E, Stensgaard I I, Norskov JK, Clausen BS, Topsoe H, and Besenbacher F

Abstract

We have studied using scanning tunneling microscopy (STM) the atomic-scale realm of molybdenum disulfide ( MoS2) nanoclusters, which are of interest as a model system in hydrodesulfurization catalysis. The STM gives the first real space images of the shape and edge structure of single-layer MoS2 nanoparticles synthesized on Au(111), and establishes a new picture of the active edge sites of the nanoclusters. The results demonstrate a way to get detailed atomic-scale information on catalysts in general.

Published
2000
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3. Design of a surface alloy catalyst for steam reforming

Author

Besenbacher F, Chorkendorff I I, Clausen BS, Hammer B, Molenbroek AM, Norskov JK, and Stensgaard I I

Abstract

Detailed studies of elementary chemical processes on well-characterized single crystal surfaces have contributed substantially to the understanding of heterogeneous catalysis. Insight into the structure of surface alloys combined with an understanding of the relation between the surface composition and reactivity is shown to lead directly to new ideas for catalyst design. The feasibility of such an approach is illustrated by the synthesis, characterization, and tests of a high-surface area gold-nickel catalyst for steam reforming.

Published
1998
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