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

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• 作者：H.Y. Leng ; J. Wei ; Q. Li ; ^{shuliqian@shu.edu.cn" class="auth_mail} ; K.C. Chou
• 关键词：Hydrogen absorbing materials ; Gas&ndash ; solid reactions ; Kinetics ; X-ray diffraction
• 刊名：Journal of Alloys and Compounds
• 出版年：5 June, 2014
• 年：2014
• 卷：597
• 期：Complete
• 页码：136-141
• 全文大小：1620 K

文摘

The effect of microwave irradiation on the hydrogen desorption properties of MgH₂ + xLiBH₄ (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 掳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 掳C in 30 min. After five cycles of hydrogen sorption at 350 掳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.