机构地区: 华南理工大学机械与汽车工程学院
出 处: 《功能材料》 2007年第A04期1628-1630,共3页
摘 要: 用X射线衍射方法(XRD)研究了Mg3Pr合金吸放氢前后的结构变化。Mg3Pr合金在吸/放氢过程中的压力.组成.等温曲线(PcI)和吸氢动力学曲线表明合金能在室温下吸氢,并且具有良好的吸氢动力学特性,能在4min之内达到饱和吸氢量的90%;其最大吸氢量分别为2.57%(质量分数)。Mg3Pr合金的吸氢动力学曲线可用Avrami-Erofeev方程拟合,说明吸氢过程符合形核长大机制。同时,也计算了Mg3Pr-H氢化反应的熵和焓。 Hydrogen storage properties and microstructure of Mg3Pr was investigated by X-ray diffraction and pressure-composition-isotherms measurement. Mg3Pr alloy can absorb hydrogen at room temperature with rapid hydriding/dehydriding kinetics. The experimental curves of hydrogen absorption kinetics can be well fitted by averami-erofeev equation. The reversible hydrogen storage capacity of Mg3Pr reaches 2.57 wt%. The enthalpy and entropy of Mg3Pr-H dehydriding reaction were also calculated.