In-situ diagnostics of metal hydride composites during cyclic hydrogenation by neutron radiography and tomography

通过中子射线照相和断层扫描对循环氢化过程中的金属氢化物复合材料进行原位诊断

• 批准号: 269882611
• 负责人: Professor Dr. John Banhart
• 金额: --
• 依托单位: Helmholtz-Zentrum Berlin für Materialien und Energie GmbH (HZB)
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2015
• 资助国家: 德国
• 起止时间: 2014-12-31 至 2021-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/269882611?language=en
• 关键词: situ; diagnostics; metal; hydride; composites

Hydrogen from renewable energy sources will play an important role as a future energy carrier. Therefore, hydrogen storage technologies are crucial in a hydrogen-based energy cycle. Compared to high pressure and cryogenic hydrogen storage, metal hydrides (MH) offer the possibility to store hydrogen with a high volumetric storage density (up to 150 g-H2/l, cf. 700 bar pressure vessels with max. 39 g-H2/l) under low pressure (2-30 bar) at moderate temperatures (room temperature) without boil-off losses.For high dynamic MH-based storage solutions MH-composites (MHC) based on a hydride forming alloy and a highly heat conducting secondary phase are advantageous. The latter is utilized to transport the reaction heat during hydrogenation and dehydrogenation, since the MH reaction zone offers only poor thermal conductivity (< 1 W/(mK)) which is not suitable for fast loading and unloading dynamics. In-situ diagnostics is needed to understand the processes inside MHC-based hydrogen storage systems under realistic operation conditions. For this purpose, neutron imaging is well suited because of the large cross-section of the hydrogen nuclei towards neutron radiation. With neutron imaging it is possible to visualize hydrogen concentrations in a non-destructive, in-situ and quantitative way. Loading and unloading can be investigated in real-time with a few seconds temporal resolution combined with a spatial resolution at micrometer-scale. Neutron tomography is the only method to resolve the three-dimensional distribution of hydrogen within a MHC quantitatively.In this DFG project it is planned to investigate for the first time the microscopic processes of the phase formation during hydrogenation-dehydrogenation of light-metal-based MHC (Mg- and Ti-base alloys) and its effect on the morphology and the microstructure of the MHC with in-situ imaging methods (neutron radiography and tomography) in real time. For the second phase a set of different highly heat conducting graphite modifications will be used. The influence of the MHC phase composition (dispersity, anisotropy, pore size distribution), the parameters of preparation and the gas and heat transfer properties on the hydriding/dehydriding kinetics and the long-term behavior will be investigated by a systematic variation of the parameters. From the structural changes of the MHC during the hydrogen-solid reactions valuable conclusions for efficient and long-term stable solid-state hydrogen storage systems can be deduced.

来自可再生能源的氢气将作为未来的能源载体发挥重要作用。因此，储氢技术在氢基能源循环中至关重要。与高压和低温储氢相比，金属氢化物（MH）提供了以高体积存储密度（高达150 g-H2/l，参见图1）存储氢的可能性。700 bar压力容器，最大对于高动态MH基存储解决方案，基于氢化物形成合金和高导热第二相的MH-复合材料（MHC）是有利的。后者用于在氢化和脱氢期间传递反应热，因为MH反应区仅提供差的导热率（< 1 W/（mK）），这不适合于快速加载和卸载动力学。现场诊断需要了解在实际操作条件下基于MHC的储氢系统内的过程。为了这个目的，中子成像是非常适合的，因为大横截面的氢原子核对中子辐射。利用中子成像，可以以非破坏性、原位和定量的方式可视化氢浓度。加载和卸载可以在几秒钟的时间分辨率结合微米级的空间分辨率进行实时研究。中子层析成像是目前唯一能够定量分析氢在MHC中三维分布的方法，本项目首次研究了轻金属基MHC氢化-脱氢过程中相形成的微观过程利用原位成像方法研究（镁基和钛基合金）及其对MHC形态和微观结构的影响（中子射线照相术和断层摄影术）在真实的时间。对于第二阶段，将使用一组不同的高导热石墨改性。的MHC相组成（分散性，各向异性，孔径分布），制备的参数和气体和传热性能的影响上的氢化/脱氢动力学和长期的行为将通过一个系统的变化的参数进行研究。从氢-固反应过程中MHC的结构变化可以推断出有效和长期稳定的固态储氢系统的有价值的结论。

项目成果

Mechanical stresses originating from metal hydride composites during cyclic hydrogenation

• DOI: 10.1016/j.ijhydene.2015.06.053
• 发表时间: 2015-08
• 期刊: International Journal of Hydrogen Energy
• 影响因子: 7.2
• 作者: F. Heubner;C. Pohlmann;Sebastian Mauermann;B. Kieback;L. Röntzsch

Correction approach of detector backlighting in radiography.

射线照相探测器背光校正方法

• DOI: 10.1063/1.5097170
• 发表时间: 2019
• 期刊: The Review of scientific instruments
• 作者: A.M. Al-Falahat;A. Kupsch;M.P. Hentschel;A. Lange;N. Kardjilov;H. Markotter;I. Manke
• 通讯作者: I. Manke

Stress development of metal hydride composites for high density hydrogen storage applications

用于高密度储氢应用的金属氢化物复合材料的应力开发

• DOI: 10.1016/j.jallcom.2017.02.113
• 发表时间: 2017
• 期刊: Journal of Alloys and Compounds
• 影响因子: 6.2
• 作者: Heubner F;Mauermann S;Kieback B;Röntzsch L
• 通讯作者: Röntzsch L

In-operando stress measurement and neutron imaging of metal hydride composites for solid-state hydrogen storage

• DOI: 10.1016/j.jpowsour.2018.06.093
• 发表时间: 2018-09-01
• 期刊: JOURNAL OF POWER SOURCES
• 影响因子: 9.2
• 作者: Heubner, Felix;Hilger, Andre;Roentzsch, Lars
• 通讯作者: Roentzsch, Lars