In recent years, there has been extensive research into the development of a hydrogen-based energy economy in order to eliminate carbon-based energy sources. Consequently, metal hydrides have shown great promise for their ability to reliably release hydrogen simply by being heated. It is crucial to know the thermal properties of metal hydride powders such as NaAlH4 in order to determine their thermal response, and the rate they expel hydrogen.
C-Therm’s Thermal Conductivity Instrument employing the Modified Transient Plane Source (MTPS) sensor was used to measure the thermal conductivities of all the metal hydrides. Measurements for the hydrides were taken both in powder form, as well as pellet form composed of powder that was pressed under six tons. The results can be seen below.
As expected, the pressed samples exhibited much higher thermal conductivities, indicating that pressed samples may be better suited to hydrogen storage, since they will approach the required heat more rapidly.
This information is originally from the paper Thermal conductivity and specific heat measurements of metal hydrides and can be found here.