铈镍合金的“氢通道”和“氢溢出”效应协同改善氢化镁的储氢性能

宋孟臣; 谢润凯; 张刘挺; 王烜; 姚振东; 魏涛; 商丹红

doi:10.1007/s12613-022-2529-x

Volume 30 Issue 5

May 2023

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文章导航 > 矿物冶金与材料学报（英文） > 2023 > 30(5): 970-976

Mengchen Song, Runkai Xie, Liuting Zhang, Xuan Wang, Zhendong Yao, Tao Wei, and Danhong Shang, Combined “Gateway” and “Spillover” effects originated from a CeNi₅ alloy catalyst for hydrogen storage of MgH₂, Int. J. Miner. Metall. Mater., 30(2023), No. 5, pp. 970-976. https://doi.org/10.1007/s12613-022-2529-x

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Mengchen Song, Runkai Xie, Liuting Zhang, Xuan Wang, Zhendong Yao, Tao Wei, and Danhong Shang, Combined “Gateway” and “Spillover” effects originated from a CeNi5 alloy catalyst for hydrogen storage of MgH2, Int. J. Miner. Metall. Mater., 30(2023), No. 5, pp. 970-976. https://doi.org/10.1007/s12613-022-2529-x

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研究论文

铈镍合金的“氢通道”和“氢溢出”效应协同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)
中国计量大学材料与化学学院，杭州 310018，中国
3)
江苏科技大学环境与化学工程学院，镇江 212003，中国

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

姚振东    E-mail: zhendongyao@foxmail.com

商丹红    E-mail: dhshang@just.edu.cn

文章亮点

(1) 通过悬浮熔炼法成功制备出CeNi₅合金，并借助氢化以及湿化学球磨方法增强其催化剂活性。

(2) CeNi₅的添加有效降低了MgH₂的吸放氢反应活化能，从而加速其吸放氢速率。

(3) CeNi₅对MgH₂的催化活性归因于Mg₂Ni/Mg₂NiH₄的“氢通道”和CeH_2.73的“氢溢流”效应。

中文摘要

氢化镁（MgH₂）因其储氢容量高(7.6wt%)、资源丰富、可逆性好等优势而在能源材料的开发方面得到了越来越多的关注。然而，MgH₂较强的金属–氢键导致其吸放氢反应动力学缓慢、热力学稳定性过高，难以获得广泛的实际应用。本文成功设计并合成了CeNi₅合金，有效改善了MgH₂的储氢性能。研究结果表明，氢化以及湿化学球磨处理后的CeNi₅ 合金呈现片层状结构，MgH₂–CeNi₅复合材料中CeNi₅含量的增加可以有效地降低MgH₂的起始放氢温度。 MgH₂–5wt%CeNi₅复合材料的初始放氢温度为174°C，比纯MgH₂的放氢温度降低了156°C。复合体系在275℃的温度下，10分钟内释放出约6.4wt%的H₂。此外，完全脱氢的样品在175℃的低温下吸收了4.8wt%的H₂，并且吸氢过程的表观活化能从(73.60 ± 1.79)下降到(46.12 ± 7.33) kJ/mol。微观结构分析表明，原位生成的Mg₂Ni/Mg₂NiH₄和CeH_2.73分别展现出“氢通道”和 “氢溢流”效应，从而有效增强了MgH₂–5wt%CeNi₅复合材料的储氢性能。

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Research Article

Combined “Gateway” and “Spillover” effects originated from a CeNi₅ alloy catalyst for hydrogen storage of MgH₂

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Abstract

Abstract

Efficient catalysts enable MgH₂ with superior hydrogen storage performance. Herein, we successfully synthesized a catalyst composed of Ce and Ni (i.e. CeNi₅ alloy) with splendid catalytic action for boosting the hydrogen storage property of magnesium hydride (MgH₂). The MgH₂–5wt%CeNi₅ composite’s initial hydrogen release temperature was reduced to 174°C and approximately 6.4wt% H₂ was released at 275°C within 10 min. Besides, the dehydrogenation enthalpy of MgH₂ was slightly decreased by adding CeNi₅. For hydrogenation, the fully dehydrogenated sample absorbed 4.8wt% H₂ at a low temperature of 175°C. The hydrogenation apparent activation energy was decreased from (73.60 ± 1.79) to (46.12 ± 7.33) kJ/mol. Microstructure analysis revealed that Mg₂Ni/Mg₂NiH₄ and CeH_2.73 were formed during the process of hydrogen absorption and desorption, exerted combined “Gateway” and “Spillover” effects to reduce the operating temperature and improve the hydrogen storage kinetics of MgH₂. Our work provides an example of merging “Gateway” and “Spillover” effects in one catalyst and may shed light on designing novel highly-effective catalysts for MgH₂ in near future.
- hydrogen storage;
- magnesium hydride;
- cerium–nickel alloys;
- catalysis

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