首页|一步煅烧Ni-MOF前驱体合成具有蠕虫状结构的Ni@CNT以提高MgH2的储氢性能

一步煅烧Ni-MOF前驱体合成具有蠕虫状结构的Ni@CNT以提高MgH2的储氢性能

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将镍基金属-有机框架(MOF)前驱体通过"过滤+煅烧"的简便方法合成镍包覆的碳纳米管(Ni@CNT)复合材料,并作为MgH2的催化剂使用.通过球磨将MgH2与不同质量分数的Ni@CNT(2.5％、5.0％、7.5％)均匀混合.MgH2-5％Ni@CNT复合材料表现出最优异的性能,423 K温度下可以在200 s内吸附5.2％(质量分数)的氢气,并且在573 K下1000 s内可以释放约3.75％(质量分数)的氢气,复合材料的放氢和再氢化激活能分别下降到87.63和45.28 kJ/mol(H2).原位合成的Mg2Ni/Mg2NiH4表现出良好的催化效果,作为"氢泵"为系统提供更多的氢扩散通道.碳纳米管的存能在一定程度上提高MgH2的性能.
Vermiform Ni@CNT derived from one-pot calcination of Ni-MOF precursor for improving hydrogen storage of MgH2
The Ni-coated carbon nanotubes(Ni@CNT)composite was synthesized by the facile"filtration+calcination"of Ni-based metal-organic framework(MOF)precursor and the obtained composite was used as a catalyst for MgH2.MgH2 was mixed evenly with different amounts of Ni@CNT(2.5,5.0 and 7.5,wt.％)through ball milling.The MgH2-5wt.％Ni@CNT can absorb 5.2 wt.％H2 at 423 K in 200 s and release about 3.75 wt.％H2 at 573 K in 1000 s.And its dehydrogenation and rehydrogenation activation energies are reduced to 87.63 and 45.28 kJ/mol(H2).The in-situ generated Mg2Ni/Mg2NiH4 exhibits a good catalytic effect due to the provided more diffusion channels that can be used as"hydrogen pump".And the presence of carbon nanotubes improves the properties of MgH2 to some extent.

Mg-based hydrogen storage materialactivation energyNi-loaded carbon nanotubescatalystmechanism

代子寅、张冰、Hideo KIMURA、肖立嵘、刘容含、倪翠、侯传信、孙学勤、张玉平、杨晓阳、于荣海、杜伟、解秀波

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烟台大学环境与材料工程学院,烟台 264005

北京航空航天大学材料科学与工程学院空天先进材料与服役教育部重点实验室,北京 100191

镁基储氢材料 激活能 镍负载碳纳米管 催化剂 机理

National Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaNatural Science Foundation of Shandong Province,ChinaNatural Science Foundation of Shandong Province,ChinaYouth Top Talent Foundation of Yantai University,ChinaGraduate Innovation Foundation of Yantai University,China

5210127451731002ZR2020QE011ZR2022ME0892219008GIFYTU2240

2024

10.1016/S1003-6326(24)66565-9

中国有色金属学报(英文版)
中国有色金属学会

中国有色金属学报(英文版)

CSTPCD
影响因子：1.183
ISSN：1003-6326
年,卷(期)：2024.34(8)