Effect of in-situ formed Mg2Ni/Mg2NiH4 compounds on hydrogen storage performance of MgH2
Effect of in-situ formed Mg2Ni/Mg2NiH4 compounds on hydrogen storage performance of MgH2
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原位形成的Mg2Ni/Mg2NiH4化合物对MgH2储氢性能的影响
DOI：
10.1016/j.ijhydene.2020.03.089
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发表时间：
2020-04
影响因子：
7.2
通讯作者：
Han Shumin
中科院分区：
文献类型：
--
作者：
Fu Yaokun;Ding Zhenmin;Ren Shuqin;Li Xinjun;Zhou Shuhua;Zhang Lu;Wang Wenfeng;Wu Lailei;Li Yuan;Han Shumin
镁基储氢材料（MgH 2）具有较高的氢密度，是一种很有前途的储氢载体，但其热力学稳定性差、动力学缓慢等缺点限制了其应用。在这项工作中，我们协助脱氢/氢化的MgH 2通过原位形成的添加剂从脱氢/氢化的MgNi 2合金的转化。Mg粉和MgNi 2合金经球磨后采用氢燃烧合成法制备了MgH 2 - 16. 7wt%MgNi2复合材料，其中大部分Mg转化为MgH 2，其余部分与MgNi 2反应生成Mg 2NiH 4，Mg 2NiH 4在脱氢过程中原位生成Mg 2Ni。结果表明，Mg 2Ni和Mg 2NiH 4均能诱导MgH 2的吸放氢，在473 K时吸放氢量为2.5wt%，比纯Mg高得多，在573 K时放氢量提高了2.6wt%。此外，Mg 2NiH 4促进的复合材料的起始脱氢温度大幅降低了100 K，而MgH 2的起始脱氢温度为623 K。此外，由于Mg 2NiH 4在脱氢过程中的催化作用，复合材料的表观活化能从129.5 kJ mol − 1H 2降低到73.2 kJ mol − 1H 2。
Magnesium-based hydrogen storage materials (MgH2) are promising hydrogen carrier due to the high gravimetric hydrogen density; however, the undesirable thermodynamic stability and slow kinetics restrict its utilization. In this work, we assist the de/hydrogenation of MgH2viain situ formed additives from the conversion of an MgNi2alloy upon de/hydrogenation. The MgH2–16.7 wt%MgNi2composite was synthesized by ball milling of Mg powder and MgNi2alloy followed by a hydrogen combustion synthesis method, where most of the Mg converted to MgH2, and the others reacted with the MgNi2generating Mg2NiH4, which produced in situ Mg2Ni during dehydrogenation. Results showed that the Mg2Ni and Mg2NiH4could induce hydrogen absorption and desorption of the MgH2, that it absorbed 2.5 wt% H2at 473 K, much higher than that of pure Mg, and the dehydrogenation capacity increased by 2.6 wt% at 573 K. Besides, the initial dehydrogenation temperature of the composite under the promotion of Mg2NiH4decreased greatly by 100 K, whereas it is 623 K for MgH2. Furthermore, benefiting from the catalyst effect of Mg2NiH4during dehydrogenation, the apparent activation energy of the composite reduced to 73.2 kJ mol−1H2from 129.5 kJ mol−1H2.
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影响因子：
--
作者：
J. Zou;Hai-quan Sun;X. Zeng;G. Ji;W. Ding
通讯作者：
J. Zou;Hai-quan Sun;X. Zeng;G. Ji;W. Ding
具有增强动力学的 Mg2Ni 的形成：使用 MgH2 代替 Mg 作为起始材料
影响因子：
3.3
作者：
Zhao, Bin;Fang, Fang;Sun, Dalin;Zhang, Qingan;Wei, Shiqiang;Cao, Fenglei;Sun, Huai;Ouyang, Liuzhang;Zhu, Min
通讯作者：
Zhu, Min
立方碳纳米盒负载的氧化钒纳米颗粒作为用于 MgH2 储氢的高活性催化剂前体
影响因子：
11.9
作者：
Wang Zeyi;Ren Zhuanghe;Jian Ni;Gao Mingxia;Hu Jianjiang;Du Fang;Pan Hongge;Liu Yongfeng
通讯作者：
Liu Yongfeng
MgH2-Fe3S4复合材料的储氢性能
影响因子：
9
作者：
Zhang Wei;Cheng Ying;Han Da;Han Shumin
通讯作者：
Han Shumin
镍基催化剂的可控制备及其对MgH2解吸性能的增强
影响因子：
6.2
作者：
Zhang Jiguang;Li Shenyang;Zhu Yunfeng;Lin Huaijun;Liu Yana;Zhang Yao;Ma Zhongliang;Li Liquan
通讯作者：
Li Liquan