构建负载于石墨烯纳米片的FeOOH纳米粒子用于改善氢化镁的储氢性能

宋孟臣; 张刘挺; 郑家广; 于子冬; 王胜男

doi:10.1007/s12613-021-2393-0

Volume 29 Issue 7

Jul. 2022

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文章导航 > 矿物冶金与材料学报（英文） > 2022 > 29(7): 1464-1473

Mengchen Song, Liuting Zhang, Jiaguang Zheng, Zidong Yu, and Shengnan Wang, Constructing graphene nanosheet-supported FeOOH nanodots for hydrogen storage of MgH₂, Int. J. Miner. Metall. Mater., 29(2022), No. 7, pp. 1464-1473. https://doi.org/10.1007/s12613-021-2393-0

Cite this article as:

Mengchen Song, Liuting Zhang, Jiaguang Zheng, Zidong Yu, and Shengnan Wang, Constructing graphene nanosheet-supported FeOOH nanodots for hydrogen storage of MgH2, Int. J. Miner. Metall. Mater., 29(2022), No. 7, pp. 1464-1473. https://doi.org/10.1007/s12613-021-2393-0

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研究论文

构建负载于石墨烯纳米片的FeOOH纳米粒子用于改善氢化镁的储氢性能

1)
江苏科技大学能源与动力学院，镇江 212003，中国
2)
中国工程物理研究院化工材料研究所，绵阳 621999，中国

通讯作者:
张刘挺 E-mail: zhanglt89@just.edu.cn

王胜男 E-mail: shengnan@caep.cn

文章亮点

(1) 通过水热法成功构筑了石墨烯纳米片负载的FeOOH纳米粒子(FeOOH NDs@G)。

(2) FeOOH NDs@G有效降低了MgH₂的放氢活化能和吸氢活化能，且复合体系20次循环后仍保持初始容量的98.5%。

(3) FeOOH NDs@G对MgH₂的催化活性归因于石墨烯纳米片与原位生成的Fe之间的协同作用。

中文摘要

氢能具有热值高、零碳排放和来源丰富等优点，被认为是一种能有效替代化石燃料、实现碳中和目标的能源载体。然而，安全高效的储氢技术仍然是大规模应用氢能的关键挑战之一。氢化镁（MgH₂）因其储氢量高(7.6wt%)、可逆性好而备受关注。本工作采用水热法成功制备了石墨烯纳米片负载的FeOOH纳米点(FeOOH NDs@G)，并通过机械球磨法将其掺杂到MgH₂中。研究结果表明， MgH₂–10wt%FeOOH NDs@G复合材料在229.8°C开始放氢，比纯MgH₂的放氢温度降低了106.8°C。在3.2 MPa的氢气压力下，完全放氢的MgH₂–10wt%FeOOH NDs@G样品可在200°C、60 min内吸收6.0wt%氢气。加入FeOOH NDs@G后，MgH₂的放氢活化能和吸氢活化能分别降至125.03和58.20 kJ·mol^–1 (纯MgH₂的脱氢活化能分别为156.05和82.80 kJ·mol^–1)。此外，MgH₂ –10wt%FeOOH NDs@G复合材料的储氢容量在20次循环后仍保持初始容量的98.5%，表现出良好的循环稳定性。FeOOH NDs@G对MgH₂的催化作用归因于石墨烯纳米片与原位生成的Fe之间的协同作用，在阻碍Mg/MgH₂颗粒团聚的同时加速了氢的扩散速率，从而使MgH₂–10wt%FeOOH NDs@G复合材料展现出良好的储氢性能。

关键词:

储氢;
氢化镁;
FeOOH NDs@G;
催化

Research Article

Constructing graphene nanosheet-supported FeOOH nanodots for hydrogen storage of MgH₂

+ Author Affiliations

Abstract

Abstract

Novel graphene-supported FeOOH nanodots (FeOOH NDs@G) were successfully prepared by a facile hydrothermal method and doped into MgH₂ through mechanical ball-milling. MgH₂ with 10wt% FeOOH NDs@G began to release hydrogen at 229.8°C, which is 106.8°C lower than that of pure MgH₂. The MgH₂–10wt% FeOOH NDs@G composite could reversibly absorb 6.0wt% hydrogen at 200°C under a 3.2 MPa hydrogen pressure within 60 min. With the addition of FeOOH NDs@G, the dehydrogenation and hydrogenation activation energy of MgH₂ was decreased to 125.03 and 58.20 kJ·mol⁻¹ (156.05 and 82.80 kJ·mol⁻¹ for pure MgH₂), respectively. Furthermore, the hydrogen capacity of the FeOOH NDs@G composite retained 98.5% of the initial capacity after 20 cycles, showing good cyclic stability. The catalytic action of FeOOH NDs@G towards MgH₂ could be attributed to the synergistic effect between graphene nanosheets and in-situ formed Fe, which prevented the aggregation of Mg/MgH₂ particles and accelerated the hydrogen diffusion during cycling, thus enabling the MgH₂–10wt% FeOOH NDs@G composite to exhibit excellent hydrogen storage performance.
- hydrogen storage;
- MgH₂;
- FeOOH NDs@G;
- catalysis

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