Nb纳米催化剂改善氢化镁的优异储氢性能

Farai Michael Nyahuma; 张刘挺; 宋孟臣; 陆雄; 肖蓓蓓; 郑家广; 吴富英

doi:10.1007/s12613-021-2303-5

Volume 29 Issue 9

Sep. 2022

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文章导航 > 矿物冶金与材料学报（英文） > 2022 > 29(9): 1788-1797

Farai Michael Nyahuma, Liuting Zhang, Mengchen Song, Xiong Lu, Beibei Xiao, Jiaguang Zheng, and Fuying Wu, Significantly improved hydrogen storage behaviors in MgH₂ with Nb nanocatalyst, Int. J. Miner. Metall. Mater., 29(2022), No. 9, pp. 1788-1797. https://doi.org/10.1007/s12613-021-2303-5

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Farai Michael Nyahuma, Liuting Zhang, Mengchen Song, Xiong Lu, Beibei Xiao, Jiaguang Zheng, and Fuying Wu, Significantly improved hydrogen storage behaviors in MgH2 with Nb nanocatalyst, Int. J. Miner. Metall. Mater., 29(2022), No. 9, pp. 1788-1797. https://doi.org/10.1007/s12613-021-2303-5

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研究论文

Nb纳米催化剂改善氢化镁的优异储氢性能

1)
江苏科技大学能源与动力学院, 镇江 212003
2)
江苏科技大学分析测试中心, 镇江 212003

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

郑家广    E-mail: jgzheng@just.edu.cn

吴富英    E-mail: wufuying@just.edu.cn

文章亮点

(1) 本文通过表面活性剂辅助球磨技术（SABM）成功制备了Nb二维纳米片。

(2) Nb纳米片有效降低了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89.2%。

(3) 文章探究了Nb在吸放氢过程中的结构演变，发现NbH是提高MgH₂储氢性能的活性催化单元，并且在球磨和脱氢状态下保持稳定。

中文摘要

氢能，一种高效的可再生能源，其大规模应用是实现碳达峰碳中和目标的重要途径。作为最具潜力的固体储氢材料之一，氢化镁（MgH₂）具有储氢量高（7.6wt%）、可逆性好等优点而备受关注，但其仍存在热力学性能稳定和动力学性能缓慢的瓶颈问题。本文探讨了通过表面活性剂辅助球磨技术（SABM）制备的Nb纳米催化剂对MgH₂储氢性能的优异改性效果。通过比较不同MgH₂–ywt%Nb（y = 0, 3, 5, 7, 9）复合材料的起始放氢温度、放氢容量和反应速率，确定了最佳的催化剂掺杂浓度。MgH₂–5wt%Nb复合材料在186.7℃开始释放氢气，在脱氢过程中共释放了7.0wt%的氢气。此外，完全放氢的样品在100℃下30分钟内能吸收4.0wt%的氢气。循环测试结果显示，MgH₂–5wt%Nb在20次循环后可以保持6.3wt%的H₂容量（89.2%）。在MgH₂中掺入Nb后，脱氢和加氢活化能值分别从140.51±4.74和70.67±2.07 kJ·mol⁻¹降至90.04±2.83和53.46±3.33 kJ·mol⁻¹。显微结构分析证明均匀分布的NbH作为活性催化单元，提高了MgH₂的储氢性能。

关键词:

Research Article

Significantly improved hydrogen storage behaviors in MgH₂ with Nb nanocatalyst

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Abstract

Abstract

The study explores the excellent modification effect of Nb nanocatalyst prepared via surfactant assisted ball milling technique (SABM) on the hydrogen storage properties of MgH₂. Optimal catalyst doping concentration was determined by comparing onset decomposition temperature, released hydrogen capacity, and reaction rate for different MgH₂–ywt%Nb (y = 0, 3, 5, 7, 9) composites. The MgH₂–5wt%Nb composite started releasing hydrogen at 186.7°C and a total of 7.0wt% hydrogen was released in the dehydrogenation process. In addition, 5wt% Nb doped MgH₂ also managed to release 4.2wt% H₂ within 14 min at 250°C and had the ability to absorb 4.0wt% hydrogen in 30 min at 100°C. Cycling tests revealed that MgH₂–5wt%Nb could retain 6.3wt% H₂ storage capacity (89.2%) after 20 cycles. Dehydrogenation and hydrogenation activation energy values were decreased from 140.51±4.74 and 70.67±2.07 kJ·mol⁻¹ to 90.04±2.83 and 53.46±3.33 kJ·mol⁻¹ after doping MgH₂ with Nb, respectively. Microstructure analysis proved that homogeneously distributed NbH acted as active catalytic unit for improving the hydrogen storage performance of MgH₂. These results indicate SABM can be considered as an option to develop other nanocatalysts for energy related areas.
- hydrogen storage;
- magnesium hydride;
- surfactant assisted ball milling;
- Nb nanosheets

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