论文标题
Mn和Cu的氢存储特性用于TAIFE0.9金属间化合物中的Fe取代
Hydrogen storage properties of Mn and Cu for Fe substitution in TiFe0.9 intermetallic compound
论文作者
论文摘要
本研究调查了MN和CU在挫折系统中对FE的部分取代，以更好地了解元素取代在其氢存储特性中的作用。研究了TIFE0.88-XMN0.02CUX（X = 0，0.02，0.04）的组成。从X射线衍射（XRD）和电子探针微型分析（EPMA）中，发现所有合金都是多相的，带有望远镜作为主要阶段，以及\ b {eta} -TI和TI4FE2O-type作为次要沉淀物，所有它们都包含Mn和Cu。增加Cu含量增加了次级量。低量的二级相有助于首次吸收二氢的主相激活，但是在增加其量时，会发生更严格的激活。 Mn和Cu取代都会增加挫折的细胞参数，从而降低了第一个高原压力。但是，CU替代升高了第二个高原压力，揭示了与该替代相关的电子效应的占主导地位。所有样品都具有快速的动力学和高氢能，使这些取代的化合物有望用于大规模固定应用。
The present study investigates the partial substitutions of Mn and Cu for Fe in the TiFe-system to gain better understanding of the role of elemental substitution on its hydrogen storage properties. The TiFe0.88-xMn0.02Cux (x = 0, 0.02, 0.04) compositions were studied. From X-Ray Diffraction (XRD) and Electron Probe Micro-Analysis (EPMA), it was found that all alloys are multi-phase, with TiFe as a major phase, together with \b{eta}-Ti and Ti4Fe2O-type as secondary precipitates, of all them containing also Mn and Cu. Increasing the Cu content augments the secondary phase amounts. Low quantity of secondary phases helps the activation of the main TiFe phase for the first hydrogen absorption, but on increasing their amounts, harsher activation occurs. Both Mn and Cu substitutions increase the cell parameter of TiFe, thus decreasing the first plateau pressure. However, Cu substitution rises the second plateau pressure revealing the predominancy of electronic effects associated to this substitution. All samples have fast kinetics and high hydrogen capacity making these substituted compounds promising for large scale stationary applications.
