MgH2+20%(w)MgTiO3复合材料的吸/放氢性能

doi:10.3866/PKU.WHXB201410081

物理化学学报 >> 2014, Vol. 30 >> Issue (12): 2323-2327.doi: 10.3866/PKU.WHXB201410081

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

1. 燕山大学环境与化学工程学院, 河北省应用化学重点实验室, 河北秦皇岛 066004;
2. 燕山大学亚稳材料科学与技术国家重点实验室, 河北秦皇岛 066004

收稿日期:2014-07-14 修回日期:2014-10-08 发布日期:2014-11-27
通讯作者: 韩树民 E-mail:hanshm@ysu.edu.cn
基金资助:
国家自然科学基金(50971112, 51001043)及河北省高等学校科学技术研究重点项目(ZD2014004)资助

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

WANG Jia-Sheng¹, HAN Shu-Min^1,2, LI Yuan¹, SHEN Na¹, ZHANG Wei¹

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:2014-07-14 Revised:2014-10-08 Published:2014-11-27
Contact: HAN Shu-Min E-mail:hanshm@ysu.edu.cn
Supported by:
The project was supported by the National Natural Science Foundation of China (50971112, 51001043) and Scientific Research Projects in Colleges and Universities in Hebei Province, China (ZD2014004).

摘要/Abstract

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

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: Hydrogen storage property, MgH₂, MgTiO₃, Catalytic activity, Activation energy

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

WANG Jia-Sheng, HAN Shu-Min, LI Yuan, SHEN Na, ZHANG Wei. Hydriding/Dehydriding Properties of an MgH₂+20%(w) MgTiO₃ Composite[J]. Acta Phys. -Chim. Sin. 2014, 30(12), 2323-2327. doi: 10.3866/PKU.WHXB201410081

链接本文: https://www.whxb.pku.edu.cn/CN/10.3866/PKU.WHXB201410081

https://www.whxb.pku.edu.cn/CN/Y2014/V30/I12/2323

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MgH₂+20%(w)MgTiO₃复合材料的吸/放氢性能

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

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