Ni-Doped Carbon Nanotube-Mg(BH4)2 Composites for Hydrogen Storage
Ni-Doped Carbon Nanotube-Mg(BH4)2 Composites for Hydrogen Storage
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Ni掺杂碳纳米管-Mg(BH4)(2)复合储氢材料
DOI：
10.1021/acsanm.0c02738
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发表时间：
2021-02
影响因子：
5.9
通讯作者：
Ying Wu
中科院分区：
文献类型：
--
作者：
Yuan Jianguang;Haixiang huang;Ying Wu
硼氢化镁具有较高的重量和体积密度（14.9 wt %,112 g/L），是一种很有前途的储氢材料，被广泛研究。不同类型的催化剂对提高硼氢化物体系的脱氢速率都有较好的催化作用。本文采用化学还原法制备了负载Ni的多壁碳纳米管（Ni/MWCNTs），并将催化剂引入到Mg(BH4)2中以提高脱氢动力学。研究了Ni/MWCNTs对Mg(BH4)2的微观组织演变和储氢性能的影响。BH4(毫克)2-5wt。% Ni/MWCNTs （95M@5NiMWCNTs）样品表现出最好的储氢性能，在93℃时开始释放氢，比Mg(BH4)2低113℃。此外，在300℃下，氢的完全解吸仅需3600 s，表明氢的解吸动力学得到了显著改善。与原Mg(BH4)2样品相比，95M@5Ni3MWCNTs2样品的脱氢表观活化能显著降低至119.5 kJ mol−1。透射电镜分析表明，Mg(BH4)2脱氢性能的显著改善主要归功于Ni和MWCNTs的协同催化作用。本研究为硼氢化物储氢材料中高性能催化剂的设计和合成提供了一条新途径，硼氢化物储氢材料有潜力作为氢燃料电池的供氢材料。
Borohydride magnesium is widely studied as a promising hydrogen storage material due to its high gravimetric and volumetric density (14.9 wt %,112 g/L). Different types of catalysts play a good catalytic role in enhancing the hydrogen desorption rates in borohydride systems. In the present paper, multi-walled carbon nanotubes supported Ni (Ni/MWCNTs) was synthesized by chemical reduction method, and the catalyst was introduced into Mg(BH4)2 in order to enhance the dehydrogenation kinetics. The effect of Ni/MWCNTs on the microstructural evolution and hydrogen storage properties of the Mg(BH4)2 is studied. The Mg(BH4)2-5wt.% Ni/MWCNTs (95M@5NiMWCNTs) sample exhibits the best hydrogen storage performance and starts to release hydrogen at 93 C, which is 113 °C lower than that of the as-milled Mg(BH4)2. Moreover, it takes only 3600 s to desorb hydrogen completely at 300 °C, showing a significant improvement on hydrogen desorption kinetics. In comparison with the primary Mg(BH4)2 sample, the dehydriding apparent activation energy of the 95M@5Ni3MWCNTs2 sample is significantly lowered to 119.5 kJ mol−1. Transmission electron microscope analysis shows that the striking improvement of dehydriding properties for Mg(BH4)2 is mainly ascribed to the synergistic catalysis of Ni and MWCNTs. This work provides a new way for the design and synthesis of high-performance catalysts in borohydride hydrogen storage materials, which is potentially utilized as a hydrogen supplier for hydrogen fuel cells.
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