Abstract:
In this study, the hydrogen storage properties of 10 wt% SrTi03 added to MgH2 +
Na3AlH6 were investigated for the first time. MgH2 + Na3AlH6 doped with SrTi03
exhibited an improvement on the onset dehydrogenation temperature and isothermal
de/rehydrogenation kinetics compared with the un-doped MgH2 + Na3AlH6
composite. The X-ray diffraction result for the MgH2 and Na3AlH6 had confirmed that
the samples do not have any impurity as no other peak was detected. Besides, the X
ray diffraction patterns also showed that SrTi03 did not decompose throughout the
heating processes. Meanwhile, result from the pressure-composition-temperature
showed that the initial desorption temperature of the doped composite was lowered by
20
°
C and the hydrogen absorption and desorption capacity were improved around
1.15 wt% and 0.4 wt%, respectively. The Kissinger analysis demonstrated that the
apparent activation energy of the composite was reduced from 129.7 kJ/mol to 117.1
kJ/mol after doped with SrTi03. Meanwhile, the scanning electron microscope results
proved that the composite with the additive of SrTi03 showed the smallest particle
sizes compared to the un-doped composite. In conclusion, the hydrogen storage
properties of MgH2 + Na3AlH6 were improved with the addition of the SrTi03
additive.
