核壳约束阻碍氢化物形成：表面氧化物对纳米多孔FeTi中氢吸附的影响
Core-Shell Confinement Blocks Hydride Formation: The Impact of Surface Oxides on Hydrogen Sorption in Nanoporous FeTi
AI总结：
针对FeTi储氢材料活化难、动力学慢等问题，提出制备纳米多孔FeTi并建立分析模型，发现表面氧化物约束引起的弹性应力影响氢吸附压力和滞后，为高效储氢奠定基础。
摘要：
金属氢化物仍然是传统气态和液态储氢的有力替代方案，具有高体积储氢密度和增强的环境条件下储氢能力。在这方面，金属间化合物FeTi是最具前景的储氢材料之一。然而，由于需要活化、初始动力学缓慢、滞后效应大以及材料成本高等问题，其广泛的工业应用仍面临挑战。在本研究中，我们旨在通过设计一种替代合成途径来克服这些限制，制备具有可控晶粒和韧带尺寸的纳米多孔及超细多孔FeTi，使我们能够详细研究所获得的明确微观结构。特别是，我们观察到表面氧化物对FeTi的约束作用，这可以与各自材料的氢吸附性能相关联。这些实验结果进一步得到一个分析模型的支持，该模型允许计算吸收压力作为依赖于微观结构的弹性应力的函数。此外，我们表明这种应力也影响吸收-解吸滞后。本研究为金属氢化物，特别是FeTi的加工-微观结构-性能关系的可控和系统研究奠定了基础，从而为基于金属氢化物的经济高效储氢解决方案铺平道路。
英文摘要：
Metal hydrides remain an intriguing alternative to conventional gaseous and liquid hydrogen storage methods, offering high volumetric storage density and enhanced hydrogen storage safety at ambient conditions. In this regard, the intermetallic compound FeTi is one of the most promising storage materials. However, its widespread industrial application remains challenging due to the need for activation, slow initial kinetics, large hysteresis, and high material costs. In this study, we aim to overcome these limitations by devising an alternative synthesis pathway to prepare nanoporous and ultra-fine porous FeTi with controlled grain and ligament sizes, allowing us to study the obtained well-defined microstructures in detail. In particular, we observe the confinement of the FeTi phase by surface oxides, which can be correlated with the hydrogen sorption properties of the respective material. These experimental results are further supported by an analytical model allowing the calculation of the absorption pressure as a function of microstructure-dependent elastic stresses. Additionally, we show that such stresses also influence the absorption-desorption hysteresis. This study lays the groundwork for the controlled and systematic study of the processing-structure-properties relations in metal hydrides and FeTi in particular, thereby paving the way to cost-effective and efficient hydrogen storage solutions based on metal hydrides.
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。
