Superior hydrogen storage properties of MgH2-10 wt.% TiC composite
Superior hydrogen storage properties of MgH2-10 wt.% TiC composite
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优级%20氢%20存储%20性能%20of%20MgH2-10%20wt.%%20TiC%20复合材料
DOI：
10.1016/j.energy.2010.04.034
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发表时间：
2010-08-01
期刊：
影响因子：
9
通讯作者：
Xu, Fen
中科院分区：
文献类型：
--
作者：
Fan, Mei-Qiang;Liu, Shu-sheng;Xu, Fen
研究了MgH2-10 wt.% TiC复合材料的储氢性能。 TiC 纳米颗粒添加剂显着改善了 MgH2 的脱/氢化动力学。该复合材料在 573 K 下可脱氢 6.3 wt.%，而研磨的 MgH2 在相同条件下仅释放 4.9 wt.% 的氢气。 TiC添加剂的改善是由于脱氢活化能从191.27 kJ mol(-1)降低到144.62 kJ mol(-1)。 MgH2-10 wt.% TiC复合材料还在1 MPa H-2、573 K（或473 K）下3000 s内吸收了6.01 wt.%（或5.1 wt.%）的氢气。即使在 1 MPa H-2 和 373 K 下，它也能吸收 4.1 wt.% 的氢气，但研磨后的 MgH2 在此条件下不能吸收氢气。此外，该复合材料具有良好的循环稳定性，经过10次脱氢/加氢循环后，其氢容量仅下降3.3%。储氢性能的改善归因于嵌入 MgH2 中的 TiC 颗粒，这为氢扩散到 MgH2-10 wt.% TiC 复合材料中提供了途径。 Crown 版权所有 (C) 2010 由 Elsevier Ltd 出版。保留所有权利。
The hydrogen storage performance of MgH2-10 wt.% TiC composite was investigated. The additive TiC nanoparticle led to a pronounced improvement in the de/hydrogenation kinetics of MgH2. The composite could dehydrogenate 6.3 wt.% at 573 K while the milled MgH2 only released 4.9 wt.% of hydrogen at the same condition. The improvement came from that the activation energy of dehydrogenation was decreased from 191.27 kJ mol(-1) to 144.62 kJ mol(-1) with the TiC additive. The MgH2-10 wt.% TiC composite also absorbed 6.01 wt.% (or 5.1 wt.%) of hydrogen under 1 MPa H-2 at 573 K (or 473 K) in 3000 s. Even at 1 MPa H-2 and 373 K. it could absorb 4.1 wt.% of hydrogen, but milled MgH2 could not absorb hydrogen at this condition. Additionally, the composite had good cycling stability, and its hydrogen capacity only decreased 3.3% of the first run after 10 de/hydrogenation cycles. The improved hydrogen storage properties were explained to the TiC particles embedded in the MgH2, which provided the pathways for the hydrogen diffusion into the MgH2-10 wt.% TiC composite. Crown Copyright (C) 2010 Published by Elsevier Ltd. All rights reserved.