Recent development on hydrogen storage properties in metal-N-H systems
Recent development on hydrogen storage properties in metal-N-H systems
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DOI：
10.1016/j.jpowsour.2006.04.003
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发表时间：
2006-09
影响因子：
9.2
通讯作者：
T. Ichikawa;H. Leng;S. Isobe;Nobuko Hanada;H. Fujii
中科院分区：
文献类型：
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作者：
T. Ichikawa;H. Leng;S. Isobe;Nobuko Hanada;H. Fujii
本文综述了我们用机械力化学方法制备的轻金属(M)-氮(N)-氢(H)体系储氢性能的最新研究结果。首先，以TiCl3为催化剂，在1 Mpa的氢气压力下球磨2小时制备了LiH和LiNH_2的复合混合物。TDS谱表明，在加热速率为5°Cmin∼1的He气流下，LiH+LiNH_2、↔Li_2NH+H_2在150~250℃的温度范围内被LiH+LiNH_2、Li_2NH+H_2反应脱附，但在250℃时的脱氢平衡压力[公式：见文本]为−_(0.1)Mpa。该温度太高，不适合车载使用，表明需要进一步改进以破坏上述储氢反应的稳定性。为此，我们通过同位素交换实验阐明了氢的脱附机理，并在此基础上设计了8LiH+3 Mg(NH_2)_2-↔_4Li_2NH+Mg_3N_2+8H_2的Li-Mg-N-H复合体系。该复合材料在12 0~2 0 0°C范围内脱附∼7quality%H，在2 0 0°C下氢脱附平衡压力[公式：见正文]高于5 Mpa，表明该体系具有良好的车载应用潜力。
In this paper, we review our recent results on hydrogen storage properties in light metals(M)–nitrogen(N)–hydrogen(H) systems prepared by mechanochemical method. At first, the composite mixture of LiH and LiNH2doped with TiCl3as a catalyst was prepared by ball milling for 2h under a H2gas pressure of 1MPa. The TDS profile indicated that ∼6mass% H2was desorbed by the reaction LiH+LiNH2↔Li2NH+H2in the temperature range from 150 to 250°C under a He gas flow at a heating rate of 5°Cmin−1, but the H-desorption equilibrium pressure [Formula: see text] was ∼0.1MPa at 250°C. This temperature is too high for onboard use, indicating that further improvement is necessary to destabilize the above H-storage reaction. For that, we clarified the H-desorption mechanism by the isotopic exchange experiments, on the basis of which we designed a new Li–Mg–N–H composite system with the reaction 8LiH+3Mg(NH2)2↔4Li2NH+Mg3N2+8H2. This composite materials desorbed ∼7mass% H2in the range from 120 to 200°C and the H-desorption equilibrium pressure [Formula: see text] was higher than 5MPa at 200°C, indicating that this system has an excellent potential for onboard applications.