Light Metal Amide/Imide Systems for On-Board Hydrogen Storage Materials

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  • 車載用水素貯蔵材料を目指した軽金属アミド・イミド系複合物質研究の最前線
  • シャサイ ヨウスイソ チョゾウ ザイリョウ オ メザシタ ケイキンゾク アミド イミドケイ フクゴウ ブッシツ ケンキュウ ノ サイゼンセン

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  We have investigated hydrogen storage materials composed of light elements such as MgH2, Metal-N-H, Metal-C-H and Metal-B-H (Metal=Li, Na, Mg, Ca) for automobile applications. Particularly, our recent research results on H-storage properties of the metal-N-H system are reviewed in this paper. The mixture of LiH and LiNH2 catalyzed with titanium compound desorbed ~6 mass% of hydrogen in temperature ranges from 150 to 250°C under a He gas flow. However, the hydrogen desorption (H-desorption) temperature at PH2=0.1 MPa was 250°C which is too high for on-board applications. We investigated the H-desorption mechanism in the reaction from LiH+LiNH2 to Li2NH+H2 by Thermal Desorption Mass Spectroscopy (TDMS) and Fourier Transform Infrared (FT-IR) analyses for the products replaced by LiD or LiND2 for LiH or LiNH2, respectively. The results indicated that the H-desorption reaction progresses through two-step elementary reactions mediated by ammonia. On the basis of the ammonia mediated model, we successfully designed a new Li-Mg-N-H system composed of 8LiH and 3Mg(NH2)2. The mechanically milled composite desorbed ~7 mass%H2 in range from 120 to 200°C and the H-desorption pressure was higher than 5 MPa at 200°C, being suitable for on-board applications. Moreover, for understanding the role of titanium compounds as catalysts, the chemical state of the titanium compounds doped in the mixture was examined by X-ray Absorption Near-Edge Structure (XANES) and Extended X-ray Absorption Fine Structure (EXAFS) measurements.<br>

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