Catalytic effect of Ni, Mg2Ni and Mg2NiH4 upon hydrogen desorption from MgH2

0369588 - ÚFM 2012 RIV US eng J - Článek v odborném periodiku
Čermák, Jiří - David, Bohumil
Catalytic effect of Ni, Mg2Ni and Mg2NiH4 upon hydrogen desorption from MgH2.
International Journal of Hydrogen Energy. Roč. 36, č. 21 (2011), s. 13614-13620. ISSN 0360-3199. E-ISSN 1879-3487
Grant CEP: GA ČR GA106/09/0814; GA ČR(CZ) GAP108/11/0148
Výzkumný záměr: CEZ:AV0Z20410507
Klíčová slova: MgH2 * Hydrogen storage * Hydrogen desorption * Catalysis
Kód oboru RIV: JG - Hutnictví, kovové materiály
Impakt faktor: 4.054, rok: 2011

MgH2 is a perspective hydrogen storage material whose main advantage is a relatively high hydrogen storage capacity (theoretically, 7.6 wt.% H2). This compound, however, shows poor hydrogen desorption kinetics. Much effort was devoted in the past to finding possible ways of enhancing hydrogen desorption rate from MgH2, which would bring this material closer to technical applications. One possible way is catalysis of hydrogen desorption. This paper investigates separate catalytic effects of Ni, Mg2Ni and Mg2NiH4 on the hydrogen desorption characteristics of MgH2. It was observed that the catalytic efficiency of Mg2NiH4 was considerably higher than that of pure Ni and non-hydrated intermetallic Mg2Ni. The Mg2NiH4 phase has two low-temperature modifications below 508 K: un-twinned phase LT1 and micro-twinned phase LT2. LT1 was observed to have significantly higher catalytic efficiency than LT2.
Trvalý link: http://hdl.handle.net/11104/0203614