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采用等容法研究了机械球磨工艺制备的Li-Mg-N-H材料储氢性能,结果发现,在室温下采用氦气对样品室体积进行标定时,由于Li-Mg-N-H材料对氦气有一定量的物理吸附,造成准确Li-Mg-N-H材料样品体积标定误差,进而造成Li-Mg-N-H储氢材料在503 K下放氢容量随压力的降低而增加异常变化。为准确标定样品体积,通过对Li-Mg-N-H材料室温氦气吸附容量测定,并采用迭代计算方法获得准确的储氢材料样品体积,进而测定Li-Mg-N-H储氢材料503 K下放氢PCT曲线,其表现为放氢容量随压力降低而减小的正常变化规律。Li-Mg-N-H储氢材料503 K,9.6 MPa氢压下的最大储氢容量为4.81%(质量分数),放氢过程表现为单一放氢平台特性。
The isobaric method was used to study the hydrogen storage performance of Li-Mg-NH prepared by mechanical ball milling. It was found that when the sample chamber volume was calibrated with helium at room temperature, Li-Mg-NH had a certain amount of helium , Resulting in an accurate calibration error of the Li-Mg-NH material sample volume. As a result, the hydrogen storage capacity of the Li-Mg-NH hydrogen storage material increases abnormally with the decrease of the pressure at 503 K. In order to accurately calibrate the volume of the sample, the volume of hydrogen storage material sample was obtained by measuring the adsorption capacity of Li-Mg-NH at room temperature and iteratively calculating the hydrogen storage capacity of the hydrogen storage material at 503 K Curve, the performance of the hydrogen discharge capacity decreases with the pressure to reduce the normal variation. The maximum hydrogen storage capacity of Li-Mg-N-H hydrogen storage material at 503 K and 9.6 MPa under hydrogen pressure is 4.81% (mass fraction), and the hydrogen desorption process is characterized by a single hydrogen desorption platform.