Catalytic effect of Ge on hydrogen desorption from MgH2

GENNARI FC,; CASTRO FJ,; GUILLERMINA URRETAVIZCAYA; MEYER G,

JOURNAL OF ALLOYS AND COMPOUNDS

Elsevier

Lugar: Amsterdam; Año: 2002 vol. 334 p. 277 - 284

0925-8388

We studied the influence of Ge on hydrogen desorption from MgH2 produced by mechanical alloying at room temperature under a hydrogen atmosphere. The structural and morphological properties, and the desorption kinetics of the products were examined by X-ray diffraction, differential scanning calorimetry, thermal desorption spectroscopy and scanning electron microscopy. The mechanical milling of Mg–Ge mixtures under hydrogen leads to the formation of Mg2Ge and MgH2. The presence of Ge decreases the hydride decomposition temperature in a range from 50 to 150C, depending on the Ge amount. On the contrary, Mg2Ge does not show any effect on hydrogen desorption.hydrogen atmosphere. The structural and morphological properties, and the desorption kinetics of the products were examined by X-ray diffraction, differential scanning calorimetry, thermal desorption spectroscopy and scanning electron microscopy. The mechanical milling of Mg–Ge mixtures under hydrogen leads to the formation of Mg2Ge and MgH2. The presence of Ge decreases the hydride decomposition temperature in a range from 50 to 150C, depending on the Ge amount. On the contrary, Mg2Ge does not show any effect on hydrogen desorption.