Abstract
Thermal desorption spectroscopy (TDS) utilising a quadrupolar mass spectrometer is a highly sensitive and selective method to study the hydrogen desorption of hydrogen storage materials. For a quantitative analysis of the hydrogen storage capacity, the TDS apparatus can be consistently calibrated by using hydrogenated PdGd alloys or TiH 2 as standards. Owing to its hygroscopic nature, the use of CaH 2 as calibration standard leads to erroneous results. The chemical reactions during the thermal desorption of CaH 2 are analysed in detail.
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