The enhanced hydrogen storage of micronanostructured hybrids of Mg(BH4)2-carbon nanotubes

被引:41
作者
Han, Mo [1 ]
Zhao, Qing [1 ]
Zhu, Zhiqang [1 ]
Hu, Yuxiang [1 ]
Tao, Zhanliang [1 ]
Chen, Jun [1 ,2 ]
机构
[1] Nankai Univ, Minist Educ, Key Lab Adv Energy Mat Chem, Tianjin 300071, Peoples R China
[2] Nankai Univ, Collaborat Innovat Ctr Chem Sci & Engn, Tianjin 300071, Peoples R China
关键词
WALLED CARBON NANOTUBES; AMMONIA BORANE; MAGNESIUM BOROHYDRIDE; LITHIUM BOROHYDRIDE; DEHYDROGENATION; CATALYSTS; DESORPTION; RELEASE; NANOPARTICLES; HYDROLYSIS;
D O I
10.1039/c5nr05108h
中图分类号
O6 [化学];
学科分类号
0703 ;
摘要
We report the facile preparation of micro-nanostructured hybrids of Mg (BH4),-carbon nanotubes (denoted as MBH-CNTs) and their enhanced hydrogen desorption/absorption performance. The hybrids with Mg(BH4)2 loadings of 25 wt%, 50 wt% and 75 wt% are synthesized through a one-step solvent method by adjusting the ratios of Mg(BH4)(2) and CNTs. The optimized MBH CNTs with 50 wt% Mg(BH,), exhibit a nanosized layer coating of Mg(BH4)(2) with the thickness of 2-6 nm on the surface of CNTs. The MBH CNTs with 50 wt% Mg(BH4)2 start to release hydrogen at 76 degrees C, which shows a significant decrease of about 200 degrees C compared with that of pure Mg(BH4)(2) (about 292 degrees C). Furthermore, 3.79 wt/0 of H2 can be desorbed from this sample within 10 min at the peak release temperature of 117 degrees C. Meanwhile, the dehydrogenated MBH CNTs could take up 2.5 wt% of H-2 at 350 degrees C under the hydrogen pressure of 10 MPa. The high chemical activity of nanosized Mg(BH4)(2) and the catalytic effect of CNTs synergistically promote reversible hydrogen storage. The simple synthesis process and enhanced hydrogen desorption/ absorption of MBH CNT hybrids shed light on the utilization of Mg(BH,), on CNTs as efficient hydrogen storage materials.
引用
收藏
页码:18305 / 18311
页数:7
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