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首页> 外文期刊>RSC Advances >A co-precipitated Mg-Ti nano-composite with high capacity and rapid hydrogen absorption kinetics at room temperature
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A co-precipitated Mg-Ti nano-composite with high capacity and rapid hydrogen absorption kinetics at room temperature

机译：在室温下具有高容量和快速氢吸收动力学的共沉淀Mg-Ti纳米复合材料

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A Mg-Ti nano-composite has been co-precipitated from a tetrahydrofuran (THF) solution containing anhydrous magnesium chloride (MgCl2), titanium tetrachloride (TiCl4) and lithium naphthalide (LiNp) as the reducing agent. X-ray diffraction (XRD), transmission electron microscopy (TEM), scanning transmission electron microscopy (STEM), and pressure-composition-temperature (PCT) techniques are used to characterize phase components, microstructure and hydrogen sorption properties of the composite. The co-precipitated Mg-Ti nano-composite contains nearly 1.0 wt% of Ti distributed homogeneously on the surface or inside Mg particles having an average particle size of about 50 nm. Orthorhombic gamma-MgH2 phases and tetragonal gamma-TiH2 phases are obtained when the Mg-Ti nano-composite is hydrogenated at 75 degrees C. PCT measurements reveal the superior hydrogen absorption property of the Mg-Ti nano-composite: its maximum hydrogen capacity can reach up to 6.2 wt% within 2 h at room temperature under a hydrogen pressure of 3 MPa. The activation energy for hydrogen absorption is determined to be 50.2 kJ mol(-1) H-2. The hydrogenation and dehydrogenation enthalpies of the nano-composite are calculated to be -73.0 +/- 1.8 and 75.8 +/- 4.7 kJ mol(-1) H-2, close to the standard values for Mg (-74.1 +/- 2.9 kJ mol(-1) H-2). The catalytic effects from the co-precipitated Ti and the tetragonal gamma-TiH2 formed during the hydrogenation process lead to extremely fast absorption kinetics at room temperature.
机译：Mg-Ti纳米复合材料已从四氢呋喃（THF）溶液中共沉淀，该溶液含有无水氯化镁（MgCl2），四氯化钛（TiCl4）和萘锂（LiNp）作为还原剂。 X射线衍射（XRD），透射电子显微镜（TEM），扫描透射电子显微镜（STEM）和压力组成温度（PCT）技术用于表征复合材料的相成分，微观结构和氢吸附性能。共沉淀的Mg-Ti纳米复合材料包含将近1.0重量％的Ti均匀地分布在平均粒径为约50nm的Mg颗粒的表面或内部。当Mg-Ti纳米复合材料在75℃下氢化时，可获得正交晶的γ-MgH2相和四方γ-TiH2相。PCT测量表明，Mg-Ti纳米复合物具有优异的氢吸收性能：其最大的氢容量可以在室温下2小时内在3 MPa的氢气压力下达到6.2 wt％。氢吸收的活化能确定为50.2 kJ mol（-1）H-2。纳米复合材料的氢化和脱氢焓计算为-73.0 +/- 1.8和75.8 +/- 4.7 kJ mol（-1）H-2，接近Mg的标准值（-74.1 +/- 2.9 kJ mol（-1）H-2）。氢化过程中形成的共沉淀Ti和四方γ-TiH2的催化作用导致在室温下极快的吸收动力学。

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