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 shu

Hydriding/Dehydriding Properties of an MgH₂+20%(w) MgTiO₃ Composite

WANG Jia-Sheng ¹ ,
HAN Shu-Min ^1,2, ,
LI Yuan ¹ ,
SHEN Na ¹ ,
ZHANG Wei ¹

1.
1. Hebei Key Laboratory of Applied Chemistry, College of Environmental and Chemical Engineering, Yanshan University, Qinhuangdao 066004, Hebei Province, P. R. China;
2. State Key Laboratory of Metastable Materials Science and Technology, Yanshan University, Qinhuangdao 066004, Hebei Province, P. R. China

Received Date: 14 July 2014
Available Online: 9 October 2014
Fund Project: 国家自然科学基金(50971112, 51001043) (50971112, 51001043)河北省高等学校科学技术研究重点项目(ZD2014004)资助 (ZD2014004)

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.
- Hydrogen storage property,
- MgH₂,
- MgTiO₃,
- Catalytic activity,
- Activation energy
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Hydriding/Dehydriding Properties of an MgH2+20%(w) MgTiO3 Composite

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Hydriding/Dehydriding Properties of an MgH₂+20%(w) MgTiO₃ Composite