The angular dependence of flux, mean energy and speed ratio for D2 molecules desorbing from a Ni(111) surface

Comşa, George; David, Rudolf; Schumacher, B.J.

doi:10.1016/0039-6028(79)90232-2

Cited by 122 publications

(13 citation statements)

References 19 publications

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“…The hydrogen desorption flux is provided by permeation through a sealed singlecrystal palladium disk, which is soldered with gold by rf heating in high vacuum to a high-purity ͑99.99%͒ Ni support cylinder. 41 Near the crystal this nickel cylinder has comparatively thick walls ͑5.5 mm͒ to suppress hydrogen permeation through nickel. This permeation source is radiatively heated by a concentric oven to temperatures between 400 and 850 K. The whole assembly is mounted on a five-axis manipulator.…”

Section: A Experimental Methodsmentioning

confidence: 99%

Vibrational and rotational population distribution ofD2associatively desorbing from Pd(100)

et al. 2001

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The rotational and vibrational state distribution of D 2 molecules desorbing from Pd͑100͒ is determined by tunable vacuum ultraviolet laser ionization spectroscopy. For the deuterium supply a permeation source is used operating at surface temperatures in the range from 400 to 850 K. The molecules are detected in rovibrational states up to (vЉ,JЉ)ϭ(0,12) and ͑1,8͒. A significant rotational cooling is observed together with a strong vibrational heating. These experimental results are found to be in good agreement with quantum-mechanical calculations based on an ab initio potential-energy surface. A consistent microscopic picture of the hydrogen reaction dynamics on Pd͑100͒ is established and thus a recent controversy about the application of the principle of detailed balance in the system D 2 /Pd(100) can be settled.

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Section: A Experimental Methodsmentioning

confidence: 99%

Vibrational and rotational population distribution ofD2associatively desorbing from Pd(100)

et al. 2001

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“…Hydrogen absorption in the Ni lattice has also been studied in surface science and heterogeneous catalysis. For example, surface science studies of Comsa et al provided a convincing evidence for the absorption and bulk diffusion of hydrogen (deuterium) into the Ni lattice . More recently, Ceyer’s group performed high precision surface science experiments in order to imbed H atoms in the Ni lattice, detect their formation, and study their reactivity .…”

Section: Electrochemical Properties Of Nickel Electrocatalystsmentioning

confidence: 99%

Recent Advances in the Understanding of Nickel-Based Catalysts for the Oxidation of Hydrogen-Containing Fuels in Alkaline Media

et al. 2020

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Nickel is a very abundant transition metal in the Earth crust, and finds numerous applications in electrochemical processes where metallic Ni or its oxides are thermodynamically stable, particularly in alkaline environments. This contribution addresses electrocatalytic properties of Ni-based catalysts in reactions of fuel oxidation in alkaline media. It firstly details the electrochemical behavior of Ni in alkaline media and approaches to determine the active surface area of Ni electrodes. Secondly, the electrocatalytic activities of Ni-based electrocatalysts for the alkaline hydrogen oxidation reaction are described (an endeavor for the development of anion exchange membrane fuel cells), along with a detailed analysis of the strategies put forward to improve them. It is notably shown that the state of Ni surface (oxidized or reduced) largely determines its electrocatalytic activity. This state of the surface also conveys a pivotal importance regarding the activity of Ni for the oxidation of complex fuels (borohydride, boranes and hydrazine). Finally, emphasis is made on the durability of Ni-based catalysts in alkaline environments. It is shown that in such media, the materials durability of Ni-based electrodes can be high, but this does not necessarily warrant stable electrocatalytic activity, owing to possible deactivation following surface oxide or bulk hydride formation in operation.

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“…A two-height barrier model, proposed by Comsa et al,9 was an improvement on the above model which failed to describe the velocity distribution of desorbing hydrogen from Ni(poly) and Ni(111),8-IO or Cu (100) and Cu(111 ).11 However, this model does not account for the fact that the mean translational energy at large desorption angles is much less than that in a Maxwellian distribution at the surface temperature. IO Toya and Ohno have successfully explained this slow desorption, considering the restricted motion of the activated molecules parallel to the surface plane.…”

Section: H 2 (G) _2h(a)7·2627 Ch 4 (G) -Ch 3 (A) + H(a)28-31 N 2 (mentioning

confidence: 99%

The crystal azimuth dependence of the angular distribution of the desorption flux of carbon dioxide produced on palladium (110) surfaces

Matsushima

1989

The Journal of Chemical Physics

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The reaction ofCO(a) and O(a) on Pd( Ito) was studied with LEED and angle-resolved thermal desorption. Heating the coadlayer produces five peaks in the CO 2 formation in the range of 160 to 460 K. The angular distribution of each is different. The distribution becomes sharper as the density of the coadlayer is increased, and it shows the dependence on the crystal azimuth. The correlation between the anisotropic angular distribution and the structure around the reaction site is discussed.

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The angular dependence of flux, mean energy and speed ratio for D2 molecules desorbing from a Ni(111) surface

Cited by 122 publications

References 19 publications

Vibrational and rotational population distribution ofD2associatively desorbing from Pd(100)

Vibrational and rotational population distribution ofD2associatively desorbing from Pd(100)

Recent Advances in the Understanding of Nickel-Based Catalysts for the Oxidation of Hydrogen-Containing Fuels in Alkaline Media

The crystal azimuth dependence of the angular distribution of the desorption flux of carbon dioxide produced on palladium (110) surfaces

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