CNTs decorated with CoFeB as a dopant to remarkably improve the dehydrogenation/rehydrogenation performance and cyclic stability of MgH2
CNTs decorated with CoFeB as a dopant to remarkably improve the dehydrogenation/rehydrogenation performance and cyclic stability of MgH2
复制标题
CoFeB作为掺杂剂修饰的CNT显着提高了MgH2的脱氢/再氢化性能和循环稳定性
DOI：
10.1016/j.ijhydene.2020.07.148
复制
发表时间：
2020-10-30
影响因子：
7.2
通讯作者：
Yan, Mi
中科院分区：
文献类型：
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作者：
Gao, Shichao;Wang, Xinhua;Yan, Mi
将氧化还原法制备的CoFeB修饰链状碳纳米管（CoFeB/CNTs）引入MgH 2中，以提高其储氢性能。CoFeB/CNT的加入使MgH 2能够在仅177摄氏度下开始解吸氢。而纯MgH 2在310摄氏度开始氢解吸。CoFeB/CNTs掺杂MgH 2复合材料中MgH 2的脱氢表观活化能仅为83.2 kJ/mol，比纯MgH 2低59.5 kJ/mol。此外，完全脱氢的MgH 2 - 10wt%CoFeB/CNT样品可以在仅30 ℃下开始吸收氢。在150 ℃、5 MPa H2下，CoFeB/CNTs掺杂MgH 2复合材料中MgH 2在10 min内可吸收6.2 wt% H2，循环动力学稳定，循环20次后，储氢量留存率为98.5%. CoFe B/CNTs原位生成Co 3 MgC、Fe、CoFe和B，为MgH 2的脱氢/再氢化反应提供了活性和成核位点。此外，碳纳米管可以提供氢的扩散途径，同时也提高了样品的热导率。所有这些都可以提高MgH 2的脱氢/再氢化性能和循环稳定性。(C)2020年氢能出版有限责任公司。由爱思唯尔有限公司出版。保留所有权利。
The chain-like carbon nanotubes (CNTs) decorated with CoFeB (CoFeB/CNTs) prepared by oxidation-reduction method is introduced into MgH2 to facilitate its hydrogen storage performance. The addition of CoFeB/CNTs enables MgH2 to start desorbing hydrogen at only 177 degrees C. Whereas pure MgH2 starts hydrogen desorption at 310 degrees C. The dehydrogenation apparent activation energy of MgH2 in CoFeB/CNTs doped-MgH2 composite is only 83.2 kJ/mol, and this is about 59.5 kJ/mol lower than that of pure MgH2. In addition, the completely dehydrogenated MgH2-10 wt% CoFeB/CNTs sample can start to absorb hydrogen at only 30 degrees C. At 150 degrees C and 5 MPa H-2, the MgH2 in CoFeB/CNTs doped-MgH2 composite can absorb 6.2 wt% H-2 in 10 min. The cycling kinetics can remain rather stable up to 20 cycles, and the hydrogen storage capacity retention rate is 98.5%. The in situ formation of Co3MgC, Fe, CoFe and B caused by the introduction of CoFeB/CNTs can provide active and nucleation sites for the dehydrogenation/rehydrogenation reactions of MgH2. Moreover, CNTs can provide hydrogen diffusion pathways while also enhancing the thermal conductivity of the sample. All of these can facilitate the dehydrogenation/rehydrogenation performance and cyclic stability of MgH2. (C) 2020 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.