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Recently, researchers of the Composite Hydride Materials Chemistry Research Group of the Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Chen Ping and Wu Guotao have made new advances in the research of hydrogen storage materials, and significantly improved Mg(NH2)2-LiH through multicomponent hydride compounding. The hydrogen absorption thermodynamic and kinetic properties of hydrogen storage materials have achieved reversible absorption and dehydrogenation below 100°C. The related research results are published in "Advanced Energy Materials" (DOI:10.1002/aenm.201602456).
Hydrogen is a clean energy carrier that enables the efficient storage and use of renewable energy and nuclear energy. However, the efficient storage of hydrogen in condensed matter is still a bottleneck for the large-scale application of hydrogen energy. The metal-amino compound hydrogen storage system designed by the research team, Mg (NH2) 2-LiH material has a high hydrogen storage capacity (5.6wt%) and a good reversibility, is considered to be the most practical vehicle applications One of hydrogen storage materials. However, the system still requires high hydrogen absorption temperature (150° C.) and dehydrogenation temperature (180° C.), so the use of waste heat from the fuel cell is not sufficient to provide a heat source for hydrogenation and dehydrogenation. In recent years, a number of research institutes at home and abroad have conducted research on this material in an effort to improve the dehydrogenation and thermodynamic properties of the material.
The research team successfully studied the dehydrogenation reaction of Mg(NH2)2-LiH hydrogen storage system from 44 kJ/mol through the in-depth study of the synergy between the three light element hydride LiBH4, Mg(NH2)2, and LiH. H2 is reduced to 24kJ/mol H2 and the thermodynamically feasible operating temperature is reduced below room temperature (25°C). At 180°C, the dehydrogenation equilibrium partial pressure of the material reaches about 100 atmospheres. The measured minimum dehydrogenation and hydrogen absorption temperatures were reduced to 98°C and 53°C, respectively, which is the lowest working temperature that has been reported for Mg(NH2)2-LiH materials. The mechanism study shows that LiBH4 acts like a "solvent", stabilizes the intermediates and products in the material dehydrogenation reaction, changes the reaction mechanism, and effectively reduces the reaction enthalpy and kinetic energy barrier. This study provides a new idea for the optimization of hydrogen storage materials.
The above research work has been supported by the National Outstanding Youth Fund, the iChem, the Helmholtz-CAS Research Cooperation Project, and the National Natural Science Foundation of China.
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