摘要
通过真空感应熔炼技术成功制备了铸态Ti_(1)Fe_(0.8)Mn_(0.2)Sm_(x)(x=0.02,0.04,0.06,0.08)储氢合金,通过X射线衍射仪(XRD),描电子显微镜(SEM),透射电子显微镜(TEM)以及Sievert等体积方法系统地研究了掺杂Sm元素对合金的相组成、微观结构及吸放氢动力学性能的影响。结果表明,Sm元素的掺杂不仅能够促进TiFeH_(2)相的形成,同时也能抑制不吸氢相TiFe_(2)相的出现,这有利于提高合金的有效储氢容量。此外,Sm元素的掺杂能有效改善合金的活化性能,大幅度降低活化潜伏期,且可以同时改善了合金的吸放氢动力学性能,并有效降低合金吸放氢活化能。且当x=0.08时,其合金吸氢活化能为-6.8 kJ·mol^(-1),放氢活化能为48.9 kJ·mol^(-1)。
As-cast Ti_(1)Sm_(x)Fe_(0.8)Mn_(0.2)(x=0.02,0.04,0.06,0.08)hydrogen storage alloys were successful prepared by vacuum induction smelting technology,and the effect of the Sm elements on the phase composition,microstructure,and the de/hydrogenation kinetic performance were systematacially studied by X-ray diffraction(XRD),scanning electron microscope(SEM),transmission electron microscopy(TEM)and Sievert isometric method.The results showed that the doping of Sm can not only promote the formation of TiFeH_(2)phase,but also inhibit the appearance of TiFe_(2)phase,which is beneficial to improve the effective hydrogen storage capacity of the alloy.Besides,the doping of Sm can effectively improve the activation properties of the alloy,and greatly reduce the activation latency.Meanwhile,it also improves the de/hydrogenation kinetic performance and effectively reduces the activation energy of hydrogen absorption and desorption.When x=0.08,the activation energy of hydrogen absorption and desorption is-6.8 kJ/mol and 48.9 kJ/mol,respectively.
作者
雍辉
姚继伟
徐先流
刘宝胜
胡季帆
YONG Hui;YAO Jiwei;XU Xianliu;LIU Baosheng;HU Jifan(School of Materials Science&Engineering,Taiyuan University of Science and Technology,Taiyuan 030024,China)
出处
《功能材料》
CAS
CSCD
北大核心
2023年第2期2217-2223,共7页
Journal of Functional Materials
基金
来晋优秀博士奖励资金(20212042)
太原科技大学科研启动基金(20202040)。
