arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2512.01072cond-mat.mtrl-sciphysics.comp-ph
收藏

X2NiH6(X = Ca、Sr、Ba)氢化物的原理研究用于氢气储存应用

First-Principles Investigation of X2NiH6 (X = Ca, Sr, Ba) Hydrides for Hydrogen Storage Applications

K. Aafi, Z. El Fatouaki, A. Jabar, A. Tahiri, M. Idiri

AI总结:

通过原理计算研究X2NiH6氢化物的热力学和机械性能,发现Ca2NiH6具有最佳的氢储存性能和稳定性。

摘要:

对Ca2NiH6、Sr2NiH6和Ba2NiH6氢化物的原理DFT计算揭示了关键热力学性质。这些化合物随着温度升高,熵和热容量增加,并且由于负的自由能,在高温下热力学上是稳定的。氢储存的动力学受氢吸附和脱附过程中熵变的影响。在光学上,Ba2NiH6在低能级显示出高折射率。机械评估表明,Sr2NiH6是不可压缩的,具有中等的可变形性,Ca2NiH6具有最高的抗变形性,而Ba2NiH6最易压缩。形成能和氢储存容量(Ca2NiH6为4.005 wt%,Sr2NiH6为2.548 wt%,Ba2NiH6为1.750 wt%)突显Ca2NiH6是氢储存技术最有前途的候选材料。

英文摘要:

First-principles DFT calculations on the hydrides Ca2NiH6, Sr2NiH6, and Ba2NiH6 reveal key thermodynamic properties. These compounds exhibit increasing entropy and heat capacity with temperature, and are thermodynamically stable at elevated temperatures due to negative free energies. The kinetics of hydrogen storage is influenced by entropy changes during hydrogen adsorption and desorption. Optically, Ba2NiH6 shows a high refractive index at low energies. Mechanical assessments indicate Sr2NiH6 is incompressible with moderate malleability, Ca2NiH6 has the highest resistance to deformation, while Ba2NiH6 is most compressible. Formation energies and hydrogen storage capacities (4.005 wt% for Ca2NiH6, 2.548 wt% for Sr2NiH6, and 1.750 wt% for Ba2NiH6) highlight Ca2NiH6 as the most promising candidate for hydrogen storage technology.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑