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为了改善LiAlH4和LiNH2的储氢性能,将LiAlH4与LiNH2通过球磨制备成LiAlH4/2LiNH2复合储氢材料体系,采用X射线粉末衍射(XRD)仪、傅里叶红外光谱分析(FTIR)仪、同步热分析(TG/DSC)仪、核磁共振波谱分析(NMR)仪等测试手段研究LiAlH4/2LiNH2复合储氢材料的储氢性能以及放氢过程的结构变化,分析了LiAlH4与LiNH2相互作用的机制。结果表明:LiNH2的加入改变了LiAlH4的放氢反应路径,有效地降低了LiAlH4的分解放氢温度,其放氢过程主要进行两步反应,最终产物为Li3AlN2。
In order to improve the hydrogen storage capacity of LiAlH4 and LiNH2, LiAlH4 and LiNH2 were prepared by ball milling into LiAlH4 / 2LiNH2 composite hydrogen storage material system. X-ray powder diffraction (XRD), Fourier transform infrared spectroscopy (FTIR) The hydrogen storage properties of LiAlH4 / 2LiNH2 composite hydrogen storage materials and the structural changes of hydrogen releasing process were studied by TG / DSC and NMR spectroscopy. The mechanism of the interaction between LiAlH4 and LiNH2 was analyzed. The results show that the addition of LiNH2 changes the hydrogen release reaction path of LiAlH4 and effectively reduces the temperature of decomposition and desorption of LiAlH4. The desorption and desorption temperatures of LiAlH4 are mainly two steps, and the final product is Li3AlN2.