通过XRD、SEM、DSC和等温动力学性能测试等方法研究了M<,g3>Pr的添加对Li-Mg-N-H体系放氢动力学性能的影响.结果表明.采用M<,g3>Pr替代MgH<,2>与LiNH<,2>进行复合后,系统的放氢动力学性能大大提高.这主要是由于M<,g3>Pr经过首次吸氢后分解出细小的MgH<,2>和PrH<,3>.与通常情况下制备的MgH<,2>相比,原位析出的MgH<,2>具有颗粒细小的特点,这将在与LiNH<,2>反应放氢过程中使得产物层变薄,从而增加H离子的扩散速率.而PrH<,3>则起到催化反应的作用.在这两者共同作用下,该体系在180℃、0.1 MPa下经35 min完成总放氢量的90%.
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