镁基合金PMMA复合制备及其结构与储氢性能

Preparation, microstructure and hydrogen storage property of composite of PMMA+ Mg-based alloy

利用球磨及喷雾成膜法制备了聚甲基丙烯酸甲酯(PMMA)纳米限域的氢化燃烧合成(HCS)镁基氢化物(MgH_2)。利用场发射扫描电镜(FESEM)、X射线粉末衍射(XRD)、透射电镜(TEM)等测试对样品进行了成分及结构分析。压力-组成-温度(PCT)测试表明样品在温度250℃、3.0 MPa H_2下,60 min内吸氢容量能到达3.24%(质量分数),同时样品放氢的起始温度由原来的250℃降到60℃,在温度250℃、0.005 MPa H_2下,120 min内放氢容量为2.08%(质量分数)。

Mg-based hydrides obtained from hydriding combustion synthesis （HCS） nano-confined by polymer polymethyl methacrylate （PMMA） were successfully prepared by mechanical milling （MM） and spray drying process.The surface morphology and crystal structure were characterized by using FESEM,XRD,TEM,et al.The absorption hydrogen amount was 3.24 % within 60 min at the temperature of 250 ℃ under the 3.0 MPa H2.Simultaneously,the on-set temperature of hydrogen desorption of the Mg-based hydrides nano-comfined by PMMA was reduced from 250 ℃ to 60 ℃ and the amount of hydrogen desorption was 2.08 % within 120 min at the temperature of 250 ℃ under the 0.005 MPa H2.