Citation: WANG Jia-Sheng, HAN Shu-Min, LI Yuan, SHEN Na, ZHANG Wei. Hydriding/Dehydriding Properties of an MgH2+20%(w) MgTiO3 Composite[J]. Acta Physico-Chimica Sinica, ;2014, 30(12): 2323-2327. doi: 10.3866/PKU.WHXB201410081
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With the aim of decreasing the dehydriding temperature and improving the hydriding/dehydriding kinetic properties of MgH2, we prepared MgH2+20%(w) MgTiO3 composite via ball-milling, and investigated the hydrogen storage properties of the composite. X- ray diffraction (XRD) results showed that the MgTiO3 decomposed into Mg2TiO4 and TiO2 during the ball-milling. These two resulting compounds remained stable during the hydriding/dehydriding processes, working as catalysts for the hydriding/dehydriding. Temperatureprogrammed- desorption (TPD) and hydriding/dehydriding kinetics tests showed that doping MgH2 with MgTiO3 lowered the onset dehydrogenation temperature of MgH2 from 389 to 249 ℃, as well as increasing the hydrogen absorption amount from 0.977%(w) to 2.902%(w) at 150 ℃, and increasing the desorption amount from 2.319% (w) to 3.653%(w) at 350 ℃. The MgTiO3 additive decreased the dehydriding activation energy of MgH2 from 116 to 95.7 kJ·mol-1. The thermodynamic and kinetic performance of the MgH2+20%(w) MgTiO3 composite was significantly improved compared with pristine MgH2, which was attributed to the high catalytic activity of the (insitu formed) TiO2 and Mg2TiO4 during the ball-milling and dehydriding processes.
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Keywords:
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Hydrogen storage property
, - MgH2,
- MgTiO3,
- Catalytic activity,
- Activation energy
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