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Citation: Wen-Qin FENG, Chao LI, Kai-Yuan LIU, Ming-Yuan CAI, Mei-Qiang FAN. Effect of Potassium tert-Butoxide on Hydrogen Storage Properties of Mg(NH2)2-2LiH System[J]. Chinese Journal of Inorganic Chemistry, ;2021, 37(6): 1097-1105. doi: 10.11862/CJIC.2021.142 shu

Effect of Potassium tert-Butoxide on Hydrogen Storage Properties of Mg(NH2)2-2LiH System

  • 1.

    School of Materials and Chemistry, China Jiliang University, Hangzhou 310018, China

  • 2.

    State Key Laboratory of Silicon Materials, School of Materials Science and Engineering, Zhejiang University, Hangzhou 310027, China

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  • The hydrogen storage properties of Mg(NH2)2-2LiH system were significantly enhanced by adding a small amount of potassium tert-butoxide (C4H9OK). The 0.08 mol C4H9OK-added sample (Mg(NH2)2-2LiH-0.08C4H9OK) showed optimum hydrogen storage performances. The on-set dehydrogenation temperature of Mg(NH2)2-2LiH-0.08C4H9OK sample was only 70℃, which was 60℃ lower than that of pristine Mg(NH2)2-2LiH sample. After fully dehydrogenated at 130℃, the Mg(NH2)2-2LiH-0.08C4H9OK sample begined to absorb hydrogen at 50℃, which was 50℃ lower than the pristine sample. At 150℃, mass ratio of 3.82% of hydrogen can be rapidly released from the Mg(NH2)2-2LiH-0.08C4H9OK sample within 50 min. The fully dehydrogenated Mg(NH2)2-2LiH-0.08C4H9OK sample could absorb mass ratio of 4.11% hydrogen at 120℃ within 50 min. Adding C4H9OK decreases the dehydrogenation activation energy and reaction enthalpy of the Mg(NH2)2-2LiH system, and enhances the hydrogen desorption kinetic and thermodynamic properties. Mechanistic investigations indicate that C4H9OK acts catalytically to enhance the dehydrogenation properties before 180℃, then it participates in the reaction to generate Li3K(NH2)4 by further increasing the operating temperature.
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