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Thermal storage properties of Mg with synergistic effect of LaNi and TiH2

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Abstract

The effect of LaNi and Ti on thermal storage properties of MgH2 was investigated. The thermal storage performances of Mg are significantly improved by adding LaNi and Ti. The pressure–composition–temperature (PCT) curves indicate that the formation enthalpy for Mg-15 wt%Ti-5 wt%LaNi sample is 73.00 kJ·mol−1, which approaches to the theoretical values of pure MgH2. The isothermal measurement indicates that, for the Mg-15 wt%Ti-5 wt%LaNi, the first absorption reaction fraction within 2 min is 93.77%, increasing by 0.32%, 0.24% and 0.08% compared with those for Mg, Mg-5 wt%LaNi and Mg-15 wt%Ti, respectively. The first desorption reaction fraction within 2 min is 73.18%, increasing by 55.91%, 9.79% and 8.12% compared with those for Mg, Mg-5 wt%LaNi and Mg-15 wt%Ti, respectively. Moreover, Mg-15 wt%Ti-5 wt%LaNi has the best cyclic stability in all the samples. The thermal storage performances of Mg by adding both LaNi and Ti are improved mainly ascribed to synergistic effect of in situ formed La4H12.19, Mg2NiH4, H0.3Mg2Ni and TiH2 particles during cyclic process. The above analysis demonstrates that Mg-15 wt%Ti-5 wt%LaNi is suitable for using as a heat storage material.

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Acknowledgements

This study was financially supported by the Beijing Municipal Commission of Science and Technology of China (D141100002014001).

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Authors and Affiliations

  1. Energy Material and Technology Research Institute, General Research Institute for Nonferrous Metals, Beijing, 100088, China

    Qi Wan, Li-Jun Jiang, Zhi-Nian Li, Yang Yang, Shu-Mao Wang & Xiao-Peng Liu

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  1. Qi Wan
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  2. Li-Jun Jiang
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  3. Zhi-Nian Li
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  6. Xiao-Peng Liu
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Correspondence to Qi Wan.

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Wan, Q., Jiang, LJ., Li, ZN. et al. Thermal storage properties of Mg with synergistic effect of LaNi and TiH2. Rare Met. 42, 1743–1751 (2023). https://doi.org/10.1007/s12598-016-0858-5

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  • DOI: https://doi.org/10.1007/s12598-016-0858-5

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