Effect of Ni and SAPO-34 co-additive on enhancing hydrogen storage performance of MgH2
Effect of Ni and SAPO-34 co-additive on enhancing hydrogen storage performance of MgH2
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Ni和SAPO-34共添加剂增强MgH2储氢性能的效果
DOI：
10.1016/j.ijhydene.2021.04.177
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发表时间：
2021-07
影响因子：
7.2
通讯作者：
Yu Hao
中科院分区：
文献类型：
--
作者：
Xi Senliang;Wang Xiaojun;Tome Kudzaishe Caren;Zhang Tonghuan;Han Zongying;Gao Meng;Zhou Shixue;Yu Hao
研究了Ni和SAPO-34的加入对mgh2储氢性能的改善。x射线衍射（XRD）结果表明，mgh2与Ni和SAPO-34的混合是一个物理反应。SAPO-34和Ni均匀分布在MgH2表面。采用差示扫描量热法（DSC）和压力-组成-等温法（PCI）研究了90MgH2/5Ni/5SAPO-34的热力学和动力学性质。结果表明，与MgH2相比，90MgH2/5Ni/5SAPO-34的脱氢活化能降低了64.3 kJ/mol。此外，还利用原位量热法研究了脱氢热值与氢含量的关系。用原位量热法计算了脱氢过程中各样品的焓值。mgh2和90MgH2/5Ni/5SAPO-34的脱氢焓分别为63.2 kJ/mol H2和53.6 kJ/mol H2。因此，Ni和SAPO-34的共掺杂显著降低了MgH2的热力学稳定性，提高了MgH2的吸氢动力学性能。
The hydrogen storage performances of MgH2improved by the addition of Ni and SAPO-34 were studied in detail. The mixture of MgH2with Ni and SAPO-34 was a physical reaction as shown by the X-ray diffraction (XRD) results. The SAPO-34 and Ni were uniformly distributed on the surface of MgH2. The thermodynamic and kinetic properties of 90MgH2/5Ni/5SAPO-34 were investigated by differential scanning calorimetry (DSC) and pressure-composition-isothermal (PCI) methods. The results showed that the dehydrogenation activation energy of 90MgH2/5Ni/5SAPO-34 decreased by 64.3 kJ/mol compared with that of MgH2. In addition, the relationship between the value of dehydrogenation heat and hydrogen content was also investigated by in-situ calorimetry. The enthalpy value of each sample in the dehydrogenation processes were calculated by in-situ calorimetry measurement. The dehydrogenation enthalpies of as-milled MgH2and 90MgH2/5Ni/5SAPO-34 were 63.2 kJ/mol H2and 53.6 kJ/mol H2, respectively. Thus, the co-doping of Ni and SAPO-34 contributed significantly to decrease the thermodynamic stability and improve the hydrogen sorption kinetic properties of MgH2.
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