溶剂热法合成Ce-Mg-Ni/C纳米复合储氢材料

Synthesis of Ce-Mg-Ni/C Nano-Composite Hydrogen Storage Materials by Solvent-Thermal Method

首先以葡萄糖为C源,水热法制备了均匀C球,再以乙二醇为溶剂,先后加入醋酸镍、醋酸镁和氯化铈,最终制得Ce-Mg-Ni/C纳米复合储氢材料。采用X射线衍射仪(XRD)分析了溶剂热后复合材料的微观结构,用扫描电镜(SEM)观察了其形貌。通过自动控制的Sieverts设备测试了材料的吸放氢动力学性能。研究表明以均匀C球为载体,预制的Ce、Mg、Ni原子比为2∶1∶2及23∶4∶7的复合材料呈现纳米结构。XRD结果表明,复合材料中出现明显的Ce2MgNi2和Ce23Mg4Ni7的峰值,并伴随有第二相CeMg3和CeNi3出现。通过P-C-T(pressure-composition-temperature)测试实验结果显示,Ce2MgNi2/C和Ce23Mg4Ni7/C复合材料在50℃下的吸附氢量分别可达到1.54%和1.05%(w/w)。

The hydrothermal method was taken to preparing uniform C-sphere from glucose as the C source,then using ethylene glycol as the solvent,and nickel acetate,magnesium acetate and cerium chloride were added successively.Finally,the Ce-Mg-Ni/C nano-composite for hydrogen storage was producing.X-ray diffraction(XRD)and scanning electron microscopy(SEM)were employed to analyze the phase composition and morphology of the solvent-thermal synthesis the nano-composites.Hydrogen adsorption-desorption measurements were performed by an automatic controlled Sieverts.SEM analysis indicated that the pre-fabricated composites with atom radios of 2∶1∶2 and 23∶4∶7 presented a nano-scale structure in uniform C-sphere templates.The XRD analysis showed that Ce2MgNi2 and Ce23Mg4Ni7 have been formed as nano-composite with carbon,and the peaks of the second phase CeMg3 and CeNi3 were presented in XRD patterns.P-C-T(pressure-composition-temperature)test date revealed that the hydrogen adsorption capacity of Ce2MgNi2/C and Ce23Mg4Ni7/C composites reached 1.54%and 1.05%(w/w)at 50℃,respectively.