摘要
Mg-based Mg-TiO2 composite powder was prepared by arc plasma evaporation of the Mg＋5%TiO2 mixture followed by passivation in air. ICP, XRD and SEM techniques were used to characterize the composition, phase components and microstructure of the composite powder. The hydrogen sorption properties of the composite powder were investigated by DSC and PCT techniques. According to the data from PCT measurements, the hydrogenation enthalpy and entropy changes of the composite powder are calculated to be-71.5 kJ/mol and-130.1 J/（K·mol）, respectively. Besides, the hydrogenation activation energy is determined to be 77.2 kJ/ mol. The results indicate that TiO2 added into Mg by arc plasma method can act as a catalyst to improve the hydrogen sorption kinetic properties of Mg.
采用直流电弧等离子体法蒸发Mg+5%Ti O2的混合物并将其在空气中钝化,制备粉体Mg-Ti O2复合储氢材料。利用电感耦合等离子光谱发生仪(ICP)、X射线衍射仪(XRD)、扫描电子显微镜(SEM)表征粉体复合材料的成分、相组成及形貌。采用压力–成分–温度(PCT)和差示扫描量热仪(DSC)对Mg-Ti O2样品的吸放氢性能进行研究。由PCT测量结果可知,Mg-Ti O2复合粉体中镁的氢化焓和氢化熵分别为-71.5 kJ/mol和-130.1 J/(K·mol),而粉体的氢化激活能为77.2 k J/mol。结果表明,采用电弧等离子体法在超细镁颗粒中加入Ti O2催化剂可显著增强镁的吸放氢动力学性能。
基金
Project(11ZR1417600)supported by Shanghai Natural Science Foundation from Science and Technology Committee of Shanghai,China
Project(11PJ1406000)supported by‘Pujiang’Project from the Science and Technology Committee of Shanghai
Project(12ZZ017)supported by Shanghai Education Commission,China
Project(20100073120007)supported by China Education Commission
