Hydrogen Storage - Innovations in Thermal Conductivity Measurement and Calorimetry Technique

The storage of hydrogen and the development of fuel cells are one of the main issues for the development of renewable energies. Metal hydrides specifically are receiving much attention as a storage media for hydrogen.
Importance of Thermal Conductivity: Highlight on Magnesium Hydride
In the development and characterization of metal hydrides for hydrogen absorption, the thermal conductivity of the material is a crucial material performance property. The thermal conductivity of the solid material is important to know how long it will take to get the pellets to an equilibrium temperature where they will begin releasing hydrogen. Furthermore, it is important to know the thermal conductivity of these pressed powders while engineering a storage device to use the powders commercially.Magnesium has a high hydrogen storage capacity but its temperature of operation is too high and the hydrogen sorption kinetics too slow for practical applications. These two aspects have been intensively investigated and many synthesis or processing methods have been proposed. One well known processing method of metal hydrides is high energy ball milling. Through ball milling, particle size reduction, nanocrystalline structure, and formation of metastable phase are obtained. However, the impact of these changes on thermal conductivity is not well known. For practical applications, good thermal conductivity is a key property to achieve acceptable hydrogen sorption kinetics. It is essential to have precise measurement of this parameter as a function of material structure and processing method. In this webinar we will report measurements of thermal conductivity via the modified transient plane source (MTPS) technique of magnesium-based hydrides before and after ball milling and other processing methods.
Siever’t Technique and Coupling Options for Enhanced Evaluation
In the wider area of hydrogen energy, the sorption on solid media is essential in many areas like solid hydrogen storage, and fuel cell. The solid hydrogen storage research has experienced a wide development and promising new candidate materials such as complex hydrides, high surface areas materials, and hybrid systems are now focusing a lot of interest.  The gas sorption Sievert’s technique has proven to be beneficial for the evaluation of the ad- or ab- sorbed amount of gases by solids in a wide range of temperature and pressure, and with a total freedom in terms of sample holder size and shape. It enables in-situ measurements of various chemical and physical parameters by coupling of techniques, for instance X-rays and neutrons diffractometers, gas chromatographs, mass spectrometers and calorimeters.  The webinar will focus more particularly on the latter and will give simple examples highlighting the benefits of the coupled Sievert’s-High Pressure calorimetry technique, like the direct measurement of enthalpies in Joules per mole of sorbed gas, even on small sample quantities.


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