Adsorption atomic hydrogen

ATOMIC HYDROGEN ADSORPTION ON BORON NITRIDE NANOTUBE SURFACES... 

S. Letardi, M. Celino, E. Cleri and V. Rosato, Atomic hydrogen adsorption on a Stone-Wales defect in graphite . Surface Science, 496, 33 (2002). 

Atomic Hydrogen Adsorption on the Basal Plane of Graphite... 

The major role of TOF-SARS and SARIS is as surface structure analysis teclmiques which are capable of probing the positions of all elements with an accuracy of <0.1 A. They are sensitive to short-range order, i.e. individual interatomic spacings that are <10 A. They provide a direct measure of the interatomic distances in the first and subsurface layers and a measure of surface periodicity in real space. One of its most important applications is the direct determination of hydrogen adsorption sites by recoiling spectrometry [12, 4T ]. Most other surface structure teclmiques do not detect hydrogen, with the possible exception of He atom scattering and vibrational spectroscopy. 

A number of metals have the ability to absorb hydrogen, which may be taken into solid solution or form a metallic hydride, and this absorption can provide an alternative reaction path to the desorption of H,. as gas. In the case of iron and iron alloys, both hydrogen adsorption and absorption occur simultaneously, and the latter thus gives rise to another equilibrium involving the transfer of H,<,s across the interface to form interstitial H atoms just beneath the surface ... 

Determine the coverages of atomic hydrogen and CO for the following three gas mixtures ptot = 1 bar and pco= 1,10,100 ppm. The operational temperature of the fuel cell is 80 °C and the following information on the adsorption... 

In the past it had been a popular belief that the electrochemical reduction of any inorganic or organic substance involves the primary electrochemical formation of a special, active form of hydrogen in the nascent state (in statu nascendi) and subsequent chemical reaction of this hydrogen with the substrate. However, for many reduction reactions a mechanism of direct electron transfer from the electrode to the substrate could be demonstrated. It is only in individual cases involving electrodes with superior hydrogen adsorption that the mechanism above with an intermediate formation of adsorbed atomic hydrogen is possible. 

Gerischer H. 1958. Mechanism of electrol5dic discharge of hydrogen and adsorption energy of atomic hydrogen. Bull Soc Chim Belg 67 506. 

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