MgH2+20%(w)MgTiO3复合材料的吸/放氢性能

引用本文: 王家盛, 韩树民, 李媛, 沈娜, 张伟. MgH₂+20%(w)MgTiO₃复合材料的吸/放氢性能[J]. 物理化学学报, 2014, 30(12): 2323-2327. doi: 10.3866/PKU.WHXB201410081 shu

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

MgH₂+20%(w)MgTiO₃复合材料的吸/放氢性能

王家盛 ^1, ,
韩树民 ^1,2, ,
李媛 ^1, ,
沈娜 ^1, ,
张伟 ^1,

基金项目:
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)

摘要:

为了降低MgH₂的吸放氢温度, 提高其吸放氢动力学性能, 本文通过球磨方法制备了MgH₂+20%(w)MgTiO₃复合储氢材料, 并研究了其储氢性能. X射线衍射(XRD)结果表明, MgTiO₃在与MgH₂球磨过程中生成Mg₂TiO₄和TiO₂, 并且Mg₂TiO₄和TiO₂在体系的吸放氢过程中保持稳定, 能够对MgH₂的吸放氢过程产生催化作用. 程序升温脱附和吸/放氢动力学测试结果表明, 添加MgTiO₃后MgH₂的初始放氢温度从389 ℃降至249 ℃.150 ℃下的吸氢量从0.977%(w)提高到2.902%(w), 350 ℃下的放氢量从2.319%(w)提高到3.653%(w). 同时, MgH₂放氢反应的活化能从116 kJ·mol^-1降至95.7 kJ·mol^-1. 与MgH₂相比, MgH₂+20%(w) MgTiO₃复合材料的热力学与动力学性能均有显著提高, 这主要是由于球磨和放氢过程中原位生成的TiO₂和Mg₂TiO₄具有良好的催化活性.

关键词:

储氢性能
/ MgH₂
/ MgTiO₃
/ 催化活性
/ 活化能

English

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

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: 27 November 2014
Fund Project:
国家自然科学基金(50971112, 51001043)

河北省高等学校科学技术研究重点项目(ZD2014004)资助

Abstract:

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.

Key words:

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1.
沈阳化工大学材料科学与工程学院沈阳 110142

MgH₂+20%(w)MgTiO₃复合材料的吸/放氢性能

English

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

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