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Metal Hydrides pp 329-343 | Cite as

The Kinetics of Hydrogen Absorption-Desorption by Metals

  • M. A. Pick
Part of the NATO Advanced Study Institutes Series book series (NSSB, volume 76)

Abstract

The rate at which hydrogen can be absorbed and desorbed by a particular metal or alloy is an important factor for hydrogen storage. It can be decisive in the question of whether it is a useful material. Many properties influence the kinetics including; the diffusion coefficient of hydrogen; the sample size or surface-tovolume ratio; the occurrence of phase transitions; the heat of solution, and related to that, the rate at which this heat can be extracted or provided during the absorption and desorption cycles respectively. Some of these factors have been dealt with in more or less detail in the past. One factor which has, received relatively little attention is the intrinsic rate of hydrogen transfer through the solid-gas interface; the surface. In the present paper I shall review some experimental studies and a theoretical model for the potential energies involved with the hydriding-dehydriding process. I shall first discuss the theoretical model in detail, then, in reviewing the experimental results, show how it applies to the model substances Nb and Ta and how two major predictions of the model are fulfilled. One of the predictions deals with the surface modifications which can enhance the hydrogen uptake rate and a second one with the temperature, coverage and pressure dependence of the sticking coefficient. Nb and Ta were chosen as model substances because most of their bulk metal-hydrogen properties such as the phase diagram, the diffusion coefficient, the solubility, the resistivity as a function of hydrogen concentration etc., have been examined in detail and are well known. Another reason is that these materials can be cleaned easily in UHV.

Keywords

Hydrogen Absorption Hydrogen Storage Hydrogen Transfer Metal Hydride Sticking Coefficient 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer Science+Business Media New York 1981

Authors and Affiliations

  • M. A. Pick
    • 1
  1. 1.Brookhaven National LaboratoryUptonUSA

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