In-operando stress measurement and neutron imaging of metal hydride composites for solid-state hydrogen storage
In-operando stress measurement and neutron imaging of metal hydride composites for solid-state hydrogen storage
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DOI：
10.1016/j.jpowsour.2018.06.093
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发表时间：
2018-09-01
影响因子：
9.2
通讯作者：
Roentzsch, Lars
中科院分区：
文献类型：
--
作者：
Heubner, Felix;Hilger, Andre;Roentzsch, Lars
金属氢化物中的固态氢存储同时提供最高的体积能量存储密度和低的工作气体压力。最近开发的金属氢化物复合材料（MHC）由可形成碳化物的金属合金和第二相（通常为石墨）组成，以实现形状稳定的复合材料和短的加载和卸载时间（< 5分钟）。氢化物的形成导致存储材料的体积膨胀。因此，它是强制性的，以表征这种行为，为了系统safety.This工作的重点是在operando表征的体积膨胀的MHC，可能会触发机械应力作用在墙壁和内部组件的存储容器。研究了具有不同金属颗粒形状（薄片和粉末）的MHC。在操作中子成像的轴向自由膨胀的MHC被施加到分析的时间分辨和空间的氢浓度，反应前沿和体积膨胀的演变和稳定性的MHC。应力测量结果表明，高达330%的各自的工作气体压力的应力发生有限的MHC。这两种技术相结合，为安全（根据ISO 16111），高效和动态金属氢化物存储系统的设计提供了关键信息和影响。
Solid-state hydrogen storage in metal hydrides offers highest volumetric energy storage densities and low working gas pressures at the same time. Recently developed metal hydride composites (MHC) consist of a hydride-forming metal alloy and a secondary phase, typically graphite, to realize form-stable composites and short loading and unloading times (< 5 min). Hydride formation causes a volume expansion of the storage material. Thus, it is mandatory to characterize this behavior for the sake of system safety.This work focuses on the in-operando characterization of the volume expansion of MHC that could trigger mechanical stresses acting on the walls and internal assemblies of the storage container. MHC with different metal particle shapes (flakes and powder) were studied. In-operando neutron imaging of axially freely expanding MHC was applied to analyze the time-resolved and spatial concentration of hydrogen, reaction fronts and the evolution of volume expansion and stability of the MHC. Stress measurements revealed that stresses of up to 330% of the respective operating gas pressure occur for confined MHC. Both techniques combined deliver crucial information and implications for the design of safe (according to ISO 16111), efficient and dynamic metal hydride storage systems.