Screening of hydrogen storage media applying high pressure thermogravimetry

A number of commercially available hydride-forming alloys of the MmNi(5-x)S n(x) (Mm=mischmetal, a mixture of lanthanides) type were examined using a h igh pressure, high temperature microbalance, scanning electron microscopy a nd X-ray diffraction. Activation conditions, reversible storage capacity, w orking pressures and temperatures, sensitivity to impurities, and morpholog ical changes were explored.