Experimental Considerations

Part of the Green Energy and Technology book series (GREEN)


In this chapter, we discuss many of the practical issues that can affect the accuracy of gas phase hydrogen sorption measurement techniques. We begin with some relevant properties of gaseous hydrogen, such as the description of its compressibility as a function of temperature and pressure, the Joule–Thomson effect, thermal conductivity and the gas purity. We then cover some of the properties of materials that can affect hydrogen sorption measurement, including our knowledge of the sample volume, density and mass, the sensitivity of materials to air and moisture, the history and purity of samples, and gaseous impurity gettering. General instrumentation issues, such as the vacuum and pressure handling capability of apparatus, its thermal stability and homogeneity, and the accuracy of pressure and temperature measurement, are then discussed. Two aspects of experimental measurement methodology, namely sample degassing and activation, and equilibration times, are then covered. The last three sections of the chapter then discuss a series of issues that can affect the volumetric, gravimetric and thermal desorption methods, respectively.


Hydrogen Storage Volumetric Measurement Hydrogen Uptake Gravimetric Measurement Hydrogen Sorption 
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©  Springer-Verlag London Limited 2011

Authors and Affiliations

  1. 1.Hiden Isochema LtdWarringtonUK

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