Effect of microwave irradiation on the hydrogen desorption properties of MgH2/LiBH4 composite

被引：13

作者：

Leng, H. Y. ^{[1
]}

Wei, J. ^{[1
]}

Li, Q. ^{[1
]}

Chou, K. C. ^{[1
]}

机构：

[1] Shanghai Univ, Shanghai Key Lab Modern Met & Mat Proc, Shanghai 200072, Peoples R China

来源：

JOURNAL OF ALLOYS AND COMPOUNDS | 2014年 / 597卷

基金：

中国国家自然科学基金;

关键词：

Hydrogen absorbing materials; Gas-solid reactions; Kinetics; X-ray diffraction; LIBH4-MGH2; COMPOSITE; SORPTION PROPERTIES; DEHYDROGENATION PROPERTIES; STORAGE PROPERTIES; MAGNESIUM HYDRIDE; RAPID SYNTHESIS; MGH2; KINETICS; SYSTEM; NI;

D O I：

10.1016/j.jallcom.2014.01.205

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

The effect of microwave irradiation on the hydrogen desorption properties of MgH2 + xLiBH(4) (x = 0-30 wt%) composite was systematically investigated. The results show that the composite can be heated rapidly with the addition of LiBH4 by microwave heating which brings about the fast dehydrogenation of MgH2. The heating rate of the samples depends on the content of LiBH4 and the microwave power, because LiBH4 acts as a microwave absorber above 107 degrees C. Isothermal kinetic results showed that the amount of hydrogen released from MgH2 + 10 wt% LiBH4 under microwave is 5 times more than that of under conventional heating at 300 degrees C in 30 min. After five cycles of hydrogen sorption at 350 degrees C, the sample can be heated even more rapidly by microwave heating. These results demonstrate that the microwave heating is an effective technology to improve the hydrogen desorption kinetics of the MgH2/LiBH4 composite with high energy efficiency. Causes for the improved microwave heating were discussed and a potential mechanism was proposed. (C) 2014 Elsevier B.V. All rights reserved.

引用

页码：136 / 141

页数：6

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