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Studies on heat capacities and thermal analysis of Li–Mg–N–H hydrogen storage system

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Abstract

The heat capacities of LiNH2 and Li2MgN2H2 were measured by a modulated differential scanning calorimetry (MDSC) over the temperature range from 223 to 473 K for the first time. The value of heat capacity of LiNH2 is bigger than that of Li2MgN2H2 from 223 to 473 K. The thermodynamic parameters such as enthalpy (H–H 298.15) and entropy (S–S 298.15) versus 298.15 K were calculated based on the above heat capacities. The thermal stabilities of them were investigated by thermogravimetric analysis (TG) at a heating rate of 10 K min−1 with Ar gas flow rate of 30 mL min−1 from room temperature to 1,080 K. TG curves showed that the thermal decomposition of them occurred in two stages. The order of thermal stability of them is: Li2MgN2H2 > LiNH2. The results indicate that addition of Mg increases the thermal stability of Li–N–H system and decrease the value of heat capacities of Li–N–H system.

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Acknowledgements

The authors gratefully acknowledge the financial support for this work from the National Natural Science Foundation of China (No. 2083309, 20873148, 20903095, 50671098, and U0734005), 863 projects (2007AA05Z115 and 2007AA05Z102), the National Basic Research Program (973 program) of China (2010CB631303) and IUPAC (Project No. 2008-006-3-100).

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Authors and Affiliations

  1. Chemistry and Chemical Engineering College, Liaoning Normal University, 850 Huanghe Road, Dalian, 116029, People’s Republic of China

    F. Xu

  2. Materials and Thermochemistry Laboratory, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, 457 Zhongshan Road, Dalian, 116023, People’s Republic of China

    L. X. Sun, P. Chen, Y. N. Qi, J. Zhang & J. N. Zhao

  3. Department of Materials Science and Engineering, Zhejiang University, Hangzhou, 310027, People’s Republic of China

    Y. F. Liu

  4. School of Chemistry and Environmental Engineering, Changsha University of Science and Technology, Changsha, 410076, People’s Republic of China

    L. Zhang, Zhong Cao, D. W. Yang & J. L. Zeng

  5. State Key Laboratory of Powder Metallurgy, Central South University, Changsha, 410083, People’s Republic of China

    Y. Du

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  1. F. Xu
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  2. L. X. Sun
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  10. D. W. Yang
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Correspondence to L. X. Sun.

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Xu, F., Sun, L.X., Chen, P. et al. Studies on heat capacities and thermal analysis of Li–Mg–N–H hydrogen storage system. J Therm Anal Calorim 100, 701–706 (2010). https://doi.org/10.1007/s10973-009-0603-5

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  • DOI: https://doi.org/10.1007/s10973-009-0603-5

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