Effect of LiCe(BH4)3Cl with a high Li ion conductivity on the hydrogen storage properties of LiMgNH system |
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| Affiliation: | 1. Kazakhstan-Britain Technical University, Almaty, Kazakhstan;2. Tomsk Polytechnic University, Tomsk, Russia;3. Innovation and Development Agency, Almaty, Kazakhstan;1. School of Chemistry, Institute of Science, Suranaree University of Technology, Nakhon Ratchasima 30000, Thailand;2. Electrochemical Materials and System Laboratory, Materials for Energy Research Unit, National Metal and Materials Technology Center (MTEC), Pathum Thani 12120, Thailand;3. Mechanical System Division, Synchrotron Light Research Institute (Public Organization), Nakhon Ratchasima 30000, Thailand;4. Research Network NANOTEC-SUT on Advanced Nanomaterials and Characterization, School of Chemistry, Suranaree University, Nakhon Ratchasima 30000, Thailand;1. GRZ Technologies Ltd., Energypolis, Rue de l’Industrie 17, CH-1951 Sion, Switzerland;2. Institute of Chemical Sciences and Engineering (ISIC), Basic Science Faculty (SB), École polytechnique fédérale de Lausanne (EPFL) Valais/Wallis, Energypolis, Rue de l’Industrie 17, CP 440, CH-1951 Sion, Switzerland;3. Empa Materials Science & Technology, CH-8600 Dübendorf, Switzerland;1. Department of Mechanical Engineering, Yuan Ze University, Chungli, 32003, Taiwan, ROC;2. Graduate School of Renewable Energy and Engineering, Yuan Ze University, Chungli, 32003, Taiwan, ROC;3. Fuel Cell Center, Yuan Ze University, Chungli, 32003, Taiwan, ROC;1. State Key Laboratory of Advanced Special Steels & Shanghai Key Laboratory of Advanced Ferrometallurgy& School of Materials Science and Engineering, Shanghai University, Shanghai 200444, China;2. Materials Genome Institute, Shanghai University, Shanghai 200444, China;3. Shanghai Institute of Materials Genome, Shanghai 200444, China |
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| Abstract: | The effect of LiCe(BH4)3Cl on the hydrogen storage properties of Mg(NH2)2 2LiH system was studied systematically, which has a high Li ion conductivity. The hydrogen desorption temperatures for LiMgNH system shift to lower temperatures by 0.05LiCe(BH4)3Cl doping with the onset temperature of dehydrogenation decreasing by 40 °C and the peak temperature decreasing by 30 °C. The Mg(NH2)22LiH–0.03LiCe(BH4)3Cl composite exhibits an improved comprehensive hydrogen storage properties, which can reversibly store about 5.0 wt% hydrogen at 160 °C, and released hydrogen as much as 8.6 times faster than that of the Mg(NH2)22LiH composite at 160 °C. The results indicated that the LiCe(BH4)3Cl-containing sample exhibited much better cycling properties than that of Mg(NH2)22LiH sample. XRD and FTIR results show that the structure of LiCe(BH4)3Cl does not change before and after hydrogen absorption/desorption, indicating it plays the catalytic effect. The hydrogen desorption activation energy of Mg(NH2)22LiH doped with 0.03LiCe(BH4)3Cl was reduced by 37.5%. The rate-controlling step of desorption shifted from the diffusion to the chemical reaction by the addition of LiCe(BH4)3Cl, indicating that the diffusion rates of small ions like H+, Li+ and Mg2+ in LiMgNH system are significantly enhanced, which could be well explained by the improved ionic conductivity of LiCe(BH4)3Cl doped sample. |
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| Keywords: | Hydrogen storage Li-Mg-N-H Catalysis Ion conductivity |
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