Vermiform Ni@CNT derived from one-pot calcination of Ni-MOF precursor for improving hydrogen storage of MgH2

IF 4.7 1区材料科学 Q1 METALLURGY & METALLURGICAL ENGINEERING Transactions of Nonferrous Metals Society of China Pub Date : 2024-08-01 DOI:10.1016/S1003-6326(24)66565-9

Zi-yin DAI , Bing ZHANG , Hideo KIMURA , Li-rong XIAO , Rong-han LIU , Cui NI , Chuan-xin HOU , Xue-qin SUN , Yu-ping ZHANG , Xiao-yang YANG , Rong-hai YU , Wei DU , Xiu-bo XIE

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Abstract

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.

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一锅煅烧 Ni-MOF 前驱体生成的 Vermiform Ni@CNT 可改善 MgH2 的储氢性能

通过对镍基金属有机框架（MOF）前驱体进行简便的 "过滤+煅烧"，合成了镍包覆碳纳米管（Ni@CNT）复合材料，并将得到的复合材料用作 MgH2 的催化剂。通过球磨将 MgH2 与不同重量百分比的 Ni@CNT （2.5、5.0 和 7.5）均匀混合。MgH2-5wt.%Ni@CNT 在 423 K 下可在 200 秒内吸收 5.2 wt.% H2，在 573 K 下可在 1000 秒内释放约 3.75 wt.% H2。原位生成的 Mg2Ni/Mg2NiH4 具有良好的催化效果，因为它提供了更多的扩散通道，可用作 "氢泵"。碳纳米管的存在在一定程度上改善了 MgH2 的性能。

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来源期刊

Transactions of Nonferrous Metals Society of China 工程技术-冶金工程

CiteScore

7.40

自引率

17.80%

发文量

8456

审稿时长

3.6 months

期刊介绍： The Transactions of Nonferrous Metals Society of China (Trans. Nonferrous Met. Soc. China), founded in 1991 and sponsored by The Nonferrous Metals Society of China, is published monthly now and mainly contains reports of original research which reflect the new progresses in the field of nonferrous metals science and technology, including mineral processing, extraction metallurgy, metallic materials and heat treatments, metal working, physical metallurgy, powder metallurgy, with the emphasis on fundamental science. It is the unique preeminent publication in English for scientists, engineers, under/post-graduates on the field of nonferrous metals industry. This journal is covered by many famous abstract/index systems and databases such as SCI Expanded, Ei Compendex Plus, INSPEC, CA, METADEX, AJ and JICST.