TY - JOUR
T1 - Hydrogen storage properties in Ti catalyzed Li-N-H system
AU - Ichikawa, T.
AU - Hanada, N.
AU - Isobe, S.
AU - Leng, H. Y.
AU - Fujii, H.
N1 - Funding Information:
This work was supported by the Grant-in-Aid for COE Research (No. 13CE2002) of the Ministry of Education, Sciences and Culture of Japan and by the project “Development for Safe Utilization and Infrastructure of Hydrogen Industrial Technology” in NEDO, Japan. The authors gratefully acknowledge Mr. T. Kubokawa, Mr. K. Tokoyoda and Mr. K. Okamoto, Research and Development Center, Taiheiyo Cement Corporation, for the useful discussion. They gratefully thank Miss E. Gomibuchi, Mr. K. Nabeta, Mr. K. Kimura, Mr. T. Nakagawa and Mr. S. Hino for their help in our laboratory.
PY - 2005/12/8
Y1 - 2005/12/8
N2 - The Li-N-H system expressed by LiNH2+LiH↔Li2NH+H2 can be expected as a promising candidate for the hydrogen storage materials because of possessing a large amount of reversible hydrogen (6.5 wt.%), a satisfactorily fast kinetics and a relatively small enthalpy change. In this work, we investigated the hydrogen storage properties of the Li-N-H system from three different points of view. Firstly, we claim that the ball milled 1:1 mixture of lithium amide (LiNH2) and lithium hydride (LiH) containing a small amount (1 mol %) of titanium chloride (TiCl3) shows superior hydrogen storage properties; a large amount of H2 gas desorbs in the temperature range from 150 to 250 ° C at a heating rate of 5 ° C/min and it reveals an excellent reversibility. Secondly, we clarify that the above hydrogen desorption reaction is composed of two kinds of elementary reactions: The one is that 2LiNH2 decomposes to Li2NH and emits ammonia (NH 3). The other is that the emitted NH3 reacts with LiH and transforms into LiNH2 and H2, indicating that NH 3 plays an important role on this H2 desorption reaction. Finally, we examined the reaction of LiH and LiOH to clarify the influence of exposing the product to air. This is because due to the fact that LiOH is easily produced by exposing LiH and LiNH2 to air. The reaction between LiH and LiOH indicated better kinetics but worse durability and an extra H 2 desorption due to transforming into Li2O.
AB - The Li-N-H system expressed by LiNH2+LiH↔Li2NH+H2 can be expected as a promising candidate for the hydrogen storage materials because of possessing a large amount of reversible hydrogen (6.5 wt.%), a satisfactorily fast kinetics and a relatively small enthalpy change. In this work, we investigated the hydrogen storage properties of the Li-N-H system from three different points of view. Firstly, we claim that the ball milled 1:1 mixture of lithium amide (LiNH2) and lithium hydride (LiH) containing a small amount (1 mol %) of titanium chloride (TiCl3) shows superior hydrogen storage properties; a large amount of H2 gas desorbs in the temperature range from 150 to 250 ° C at a heating rate of 5 ° C/min and it reveals an excellent reversibility. Secondly, we clarify that the above hydrogen desorption reaction is composed of two kinds of elementary reactions: The one is that 2LiNH2 decomposes to Li2NH and emits ammonia (NH 3). The other is that the emitted NH3 reacts with LiH and transforms into LiNH2 and H2, indicating that NH 3 plays an important role on this H2 desorption reaction. Finally, we examined the reaction of LiH and LiOH to clarify the influence of exposing the product to air. This is because due to the fact that LiOH is easily produced by exposing LiH and LiNH2 to air. The reaction between LiH and LiOH indicated better kinetics but worse durability and an extra H 2 desorption due to transforming into Li2O.
KW - Gas-solid reactions
KW - High-energy ball milling
KW - Hydrogen storage materials
KW - Nanostructures
KW - Thermal analysis
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U2 - 10.1016/j.jallcom.2004.11.110
DO - 10.1016/j.jallcom.2004.11.110
M3 - Article
AN - SCOPUS:28044457677
SN - 0925-8388
VL - 404-406
SP - 435
EP - 438
JO - Journal of the Less-Common Metals
JF - Journal of the Less-Common Metals
IS - SPEC. ISS.
ER -