TY - JOUR
T1 - Desorption behaviours from metal-N-H systems synthesized by ball milling
AU - Leng, H. Y.
AU - Ichikawa, T.
AU - Isobe, S.
AU - Hino, S.
AU - Hanada, N.
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” of NEDO, Japan. The authors gratefully acknowledge Miss E. Gomibuchi, Mr. K. Nabeta, Mr. K. Kimura, and Mr. T. Nakagawa for their help in our laboratory.
PY - 2005/12/8
Y1 - 2005/12/8
N2 - Three metal amides LiNH2, NaNH2 and Mg(NH 2)2 were synthesized by ball milling the metal hydrides under gaseous ammonia NH3 at room temperature. The decomposition behaviours from these metal amides were investigated by thermal desorption mass spectroscopy and thermogravimetry analysis methods. The results showed that LiNH2 decomposed at T>230° C and was transformed into the imide Li2NH with emitting NH3, while Mg(NH 2)2, decomposed at T>180° C and was transformed into MgNH and finally into Mg3N2 with emitting NH 3 within 500 ° C. Then, a new metal-N-H system composed of Mg(NH2)2 and LiH with a molar ratio of 3:8 was designed by ball milling treatment and examined the hydrogen storage properties. The results showed that this system could reversibly absorb/desorb a large amount of hydrogen (∼ 7 wt.%) at a moderate temperature and pressure, which was better than the system of LiNH2 and LiH for hydrigen storage.
AB - Three metal amides LiNH2, NaNH2 and Mg(NH 2)2 were synthesized by ball milling the metal hydrides under gaseous ammonia NH3 at room temperature. The decomposition behaviours from these metal amides were investigated by thermal desorption mass spectroscopy and thermogravimetry analysis methods. The results showed that LiNH2 decomposed at T>230° C and was transformed into the imide Li2NH with emitting NH3, while Mg(NH 2)2, decomposed at T>180° C and was transformed into MgNH and finally into Mg3N2 with emitting NH 3 within 500 ° C. Then, a new metal-N-H system composed of Mg(NH2)2 and LiH with a molar ratio of 3:8 was designed by ball milling treatment and examined the hydrogen storage properties. The results showed that this system could reversibly absorb/desorb a large amount of hydrogen (∼ 7 wt.%) at a moderate temperature and pressure, which was better than the system of LiNH2 and LiH for hydrigen storage.
KW - Hydrogen storage materials
KW - Mechanochemical synthesis
KW - Thermal analysis
KW - X-ray diffraction
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U2 - 10.1016/j.jallcom.2004.09.082
DO - 10.1016/j.jallcom.2004.09.082
M3 - Article
AN - SCOPUS:28044460088
SN - 0925-8388
VL - 404-406
SP - 443
EP - 447
JO - Journal of the Less-Common Metals
JF - Journal of the Less-Common Metals
IS - SPEC. ISS.
ER -