Thermodynamic destabilisation of SrH2 using Al for the next generation of high temperature thermal batteries
Thermodynamic destabilisation of SrH2 using Al for the next generation of high temperature thermal batteries
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使用 Al 对 SrH2 进行热力学失稳，用于下一代高温热电池
DOI：
10.1016/j.jallcom.2021.162404
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发表时间：
2021
影响因子：
6.2
通讯作者：
C. Buckley
中科院分区：
文献类型：
--
作者：
T. Humphries;M. Paskevicius;A. Alamri;C. Buckley
热电池是存储可再生能源或电网多余电力的理想选择。最高效的热电池利用可逆热化学反应，放电过程中产生的热量驱动热机。金属氢化物可以用作这些电池中的热能储存（TES）材料，因为当加热时，氢气会在吸热过程中释放出来，为电池充电。当该氢被重新引入金属时，金属氢化物在放热反应（放电）过程中重新形成。最佳的热电池应具有高工作温度、低工作压力和低材料成本。 SrH2 可以满足这些要求，但其工作温度高于 1000 °C。在氢化锶中添加铝会导致热不稳定，从而允许 1 bar 氢气的工作温度为 846 ± 36 °C，从而提供作为 TES 材料的理想特性。 SrH2-2Al 系统分两个阶段进行反应，第二步在 50 个循环中仅表现出容量下降 32%。第二步的压力-成分等温线分析确定H2解吸的热力学为ΔHdes=132±2kJ/mol H2和ΔSdes=118±2J/K/mol H2。通过扫描电子显微镜进行的进一步研究确定了循环活性下形态的变化，同时热分析和粉末 X 射线衍射确定了该过程的反应途径。该系统的成本分析表明，材料成本的降低将增强该材料的技术应用。
Thermal batteries are ideal for storing renewable energies or excess electricity from the grid. The most efficient thermal batteries utilize reversible thermochemical reactions where the heat produced during discharge drives a heat engine. Metal hydrides can be used as the thermal energy storage (TES) material in these batteries, since when heated, hydrogen is released in an endothermic process, charging the battery. When this hydrogen is reintroduced to the metal the metal hydride is reformed during the exothermic reaction (discharge). The optimal thermal battery would have a high operating temperature, low operating pressure and low material cost. SrH2could meet these demands except its operating temperature is above 1000 °C. Adding aluminum to strontium hydride causes thermal destablization allowing an operating temperature of 1 bar hydrogen at 846 ± 36 °C, providing ideal properties as a TES material. The SrH2-2Al system reacts in two stages with the second step exhibiting only a 32% reduction in capacity over 50 cycles. Pressure-composition isotherm analysis of the second step determined the thermodynamics of H2desorption to be ΔHdes= 132 ± 2 kJ/mol H2and ΔSdes= 118 ± 2 J/K/mol H2. Further studies by scanning electron microscopy have determined changes in morphology over cyclic activity, while simultaneous thermal analysis and powder X-ray diffraction have identified the reaction pathways of the process. A cost analysis of the system has shown that a reduction in materials cost would enhance technological application of this material.
影响因子：
7.2
作者：
Manickam, Kandavel;Mistry, Priyen;Felderhoff, Michael
通讯作者：
Felderhoff, Michael