In Situ Embedding of Mg2NiH4 and YH3 Nanoparticles into Bimetallic Hydride NaMgH3 to Inhibit Phase Segregation for Enhanced Hydrogen Storage
In Situ Embedding of Mg2NiH4 and YH3 Nanoparticles into Bimetallic Hydride NaMgH3 to Inhibit Phase Segregation for Enhanced Hydrogen Storage
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DOI：
10.1021/jp508395s
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发表时间：
2014-10
影响因子：
3.7
通讯作者：
Yongtao Li;Luxin Zhang;Qingan Zhang;Fang Fang-Fang;Dalin Sun;Kongzhai Li;Hua Wang;L. Ouyang;Min Z
中科院分区：
文献类型：
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作者：
Yongtao Li;Luxin Zhang;Qingan Zhang;Fang Fang-Fang;Dalin Sun;Kongzhai Li;Hua Wang;L. Ouyang;Min Z
首次证明了循环过程中的组分偏析是导致双金属氢化物NaMgH3动力学恶化的原因。为了解决这一问题，我们提出了一种将Mg2NiH4和YH3原位嵌入NaMgH3的方法，该方法是在H2气氛下以非晶态Mg12YNi合金和NaH为起始材料，通过固相反应完成的。利用这种新方法，12wt %的Mg2NiH4相和11wt %的YH3相均匀地嵌入到NaMgH3基体中。与纯NaMgH3相比，该复合材料的热力学性质没有变化，但其吸氢和解吸循环动力学明显增强。此外，还提出了防止金属Na宏观偏析、晶粒细化和协同催化效应等增强动力学的合理机制。所有这些机制都依赖于密切相互分散的Mg2NiH4和YH3纳米颗粒嵌入到t…
For the first time, component segregation during cycling was demonstrated to be responsible for the deterioration in the kinetics of bimetallic hydride NaMgH3. To solve this problem, we propose a method involving in situ embedding of Mg2NiH4 and YH3 into NaMgH3, which is accomplished with a solid-phase reaction using amorphous Mg12YNi alloy and NaH as starting materials under a H2 atmosphere. Using this novel method, 12 wt % of the Mg2NiH4 phase and 11 wt % of the YH3 phase were homogeneously embedded in the NaMgH3 matrix. In comparison to those of pure NaMgH3, this composite material exhibits no change in thermodynamics but shows greatly enhanced kinetics for hydrogen absorption and desorption cycling. In addition, reasonable mechanisms for the enhanced kinetics have been proposed including the prevention of macroscopic segregation of metallic Na, grain refinement, and a synergistic catalytic effect. All of these mechanisms rely on the intimately interdispersed Mg2NiH4 and YH3 nanoparticles embedded in t...