From atoms to crystallites: adsorption on oxide-supported metal particles

Frank, Martin M.; Bäumer, Marcus

doi:10.1039/b004091f

Cited by 177 publications

(231 citation statements)

References 80 publications

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“…There is a substantial literature on metal NPs, specially on their synthesis, which can be accomplished using different methods such as chemical reduction [33], seed-mediated [34], photochemical [35], electrochemical [36], sonochemical [37], lithography [38], galvanic replacement [39], thermal evaporation [40], radiolysis [41], sol-gel [42], laser ablation [43] or CVD [44].…”

Section: Introductionmentioning

confidence: 99%

Spectroelectrochemistry at free-standing carbon nanotubes electrodes

Ibáñez

Garoz‐Ruiz

Plana

et al. 2016

Electrochimica Acta

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General rightsThis document is made available in accordance with publisher policies. Please cite only the published version using the reference above. Full terms of use are available: http://www.bristol.ac.uk/pure/about/ebr-terms 1. ISE member. Abstract.A versatile and low-cost methodology for fabricating free-standing carbon nanotubes (CNT) electrodes for electrochemical and spectroelectrochemical applications is described. The uniformity, flexibility and resistance to bending of these films make them one of the most interesting membranes in a wide range of applications. CNT electrodes were characterized by Raman spectroscopy and scanning electron microscopy and their electrochemical performance was assessed employing various redox species such as ferrocenemethanol, hexacyanoferrate (II) and dopamine. Free-standing single-walled CNT electrodes exhibit good conductivity and transparency to UV-Vis radiation, making them suitable as optically transparent electrodes. This is exemplified by monitoring, using UV-Vis absorption spectroelectrochemistry, the electrodeposition of gold nanoparticles (AuNPs) on one face of the free-standing CNT electrodes, while the other face remained unmodified.

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Section: Introductionmentioning

confidence: 99%

Spectroelectrochemistry at free-standing carbon nanotubes electrodes

Ibáñez

Garoz‐Ruiz

Plana

et al. 2016

Electrochimica Acta

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“…In this Letter, we present STM measurements of line defects in a thin Al 2 O 3 film on NiAl(110), which is a well-established support in Al 2 O 3 -based model catalysts [6 -8]. Previous experiments have shown that these dislocations strongly influence the nucleation and growth of metal clusters, such as Pd or Rh [9]. Though it has been possible to describe the atomic structure of the Pd clusters via STM [10], the microscopic structure of the underlying line defects has not yet been unraveled.…”

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confidence: 99%

Atomic Structure of Antiphase Domain Boundaries of a ThinAl2O3Film on NiAl(110)

et al. 2003

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Line defects of a thin alumina film on NiAl(110) have been studied on the atomic level with scanning tunneling microscopy at 4 K. While boundaries between two reflection domains do not expose a characteristic structure, antiphase domain boundaries are well ordered. The latter boundaries result from the insertion of a row of O atoms, as atomically resolved images of the topmost oxygen layer show. The insertion occurs only in two of the three characteristic directions of the quasihexagonal O lattice. Depending on the direction, either straight or zigzagged boundaries form. An atomic characterization of line defects on the oxide surface is a first step to correlate their topographic structure and chemical activity.

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“…This is understandable because corresponding pressure falls well in the pressure window for disintegration according to above calculation. In a time-resolved in situ Fourier transformed infrared adsorption spectroscopy (FT-IR) study of Al 2 O 3 -supported Rh particles (298 K and 26.7 kPa), 38 the Rh(CO) complex was found at the initial exposure of CO, but only the Rh(CO) 2 complex was observed under the extended exposure. This can be rationalized by the above calculations which predict that the Rh(CO) 2 complex is thermodynamically more favorable at the experimental conditions.…”

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confidence: 99%

Atomistic Theory of Ostwald Ripening and Disintegration of Supported Metal Particles under Reaction Conditions

2013

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Understanding Ostwald ripening and disintegration of supported metal particles under operating conditions has been of central importance in the study of sintering and dispersion of heterogeneous catalysts for long-term industrial implementation. To achieve a quantitative description of these complicated processes, an atomistic and generic theory taking into account the reaction environment, particle size and morphology, and metal− support interaction is developed. It includes (1) energetics of supported metal particles, (2) formation of monomers (both the metal adatoms and metal−reactant complexes) on supports, and (3) corresponding sintering rate equations and total activation energies, in the presence of reactants at arbitrary temperature and pressure. The thermodynamic criteria for the reactant assisted Ostwald ripening and induced disintegration are formulated, and the influence of reactants on sintering kinetics and redispersion are mapped out. Most energetics and kinetics barriers in the theory can be obtained conveniently by first-principles theory calculations. This allows for the rapid exploration of sintering and disintegration of supported metal particles in huge phase space of structures and compositions under various reaction environments. General strategies of suppressing the sintering of the supported metal particles and facilitating the redispersions of the low surface area catalysts are proposed. The theory is applied to TiO 2 (110) supported Rh particles in the presence of carbon monoxide, and reproduces well the broad temperature, pressure, and particle size range over which the sintering and redispersion occurred in such experiments. The result also highlights the importance of the metal−carbonyl complexes as monomers for Ostwald ripening and disintegration of supported metal catalysts in the presence of CO.

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From atoms to crystallites: adsorption on oxide-supported metal particles

Cited by 177 publications

References 80 publications

Spectroelectrochemistry at free-standing carbon nanotubes electrodes

Spectroelectrochemistry at free-standing carbon nanotubes electrodes

Atomic Structure of Antiphase Domain Boundaries of a ThinAl2O3Film on NiAl(110)

Atomistic Theory of Ostwald Ripening and Disintegration of Supported Metal Particles under Reaction Conditions

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