Tian Hongxiao, Wang Qichang, Li Xia, Luo Long, Li Yongzhi
School of Science, Inner Mongolia University of Science and Technology, Baotou 014010, China.
Baotou Materials Research Institute of Shanghai Jiao Tong University, Baotou 014010, China.
Materials (Basel). 2023 Jun 25;16(13):4576. doi: 10.3390/ma16134576.
MgNiLa ( = 0, 5, 10, 15) alloys were successfully prepared by the vacuum induction melting method. The structural characterizations of the alloys were performed by using X-ray diffraction and scanning electron microscope. The effects of nickel content on the microstructure and hydrogen storage kinetic of the as-cast alloys were investigated. The results showed that the alloys are composed of a primary phase of MgNi, lamella eutectic composites of Mg + MgNi, and some amount of LaMg and LaMg. Nickel addition significantly improved the hydrogen-absorption kinetic performance of the alloy. At 683 K, MgNiLa alloy and MgNiLa alloy underwent hydrogen absorption and desorption reactions for 2 h, respectively, and their hydrogen absorption and desorption capacities were 4.16 wt.% and 4.1 wt.%, and 4.92 wt.% and 4.69 wt.%, respectively. Using the Kissinger equation, it was calculated that the activation energy values of MgNiLa, MgNiLa, MgNiLa and MgNiLa alloys were in the range of 68.575.2 kJ/mol, much lower than 150160 kJ/mol of MgH.
通过真空感应熔炼法成功制备了MgNiLa（=0、5、10、15）合金。采用X射线衍射和扫描电子显微镜对合金进行了结构表征。研究了镍含量对铸态合金微观结构和储氢动力学的影响。结果表明，合金由MgNi初生相、Mg+MgNi片状共晶复合物以及一定量的LaMg和LaMg组成。添加镍显著提高了合金的吸氢动力学性能。在683K时，MgNiLa合金和MgNiLa合金分别进行了2小时的吸氢和解吸反应，其吸氢和解吸容量分别为4.16 wt.%和4.1 wt.%，以及4.92 wt.%和4.69 wt.%。利用基辛格方程计算得出，MgNiLa、MgNiLa、MgNiLa和MgNiLa合金的活化能值在68.575.2 kJ/mol范围内，远低于MgH的150160 kJ/mol。
