Ammonia borane/magnesium hydride/heat conducting agent composite hydrogen storage material and its preparation and hydrogen release method

Abstract

The invention discloses an ammonia borane / magnesium hydride / heat conduction agent compound hydrogen storage material. The material is composed of magnesium hydride, a heat conduction agent, and ammonia borane subjected to partial phase change after being placed at room temperature for six months or more or thermally treated for 10-30 min, wherein the molar ratio of ammonia borane to magnesium hydride is 2:(0.8-1), and the mass of the heat conduction agent is 5-30 wt% of the sum of the mass of ammonia borane and that of magnesium hydride. The invention further provides preparing and hydrogen desorption methods of the compound hydrogen storage material. Through combination of component optimization and hydrogen desorption condition control, high-capacity hydrogen desorption of the compound hydrogen storage material under the low-temperature condition is well achieved, and then application requirements are met. Commercial application in the fields such as hydrogen refueling stations, hydrogen cell automobiles and mobile hydrogen sources can be achieved. Therefore, the ammonia borane / magnesium hydride / heat conduction agent compound hydrogen storage material has high practical value and popularization value.

Description

technical field [0001] The invention relates to the technical field of clean energy materials, in particular to an ammonia borane / magnesium hydride / heat conducting agent composite hydrogen storage material and its preparation and hydrogen release methods. Background technique [0002] Hydrogen energy is considered as an ideal secondary energy source due to its wide source, clean and pollution-free characteristics. Therefore, the development of hydrogen fuel cell vehicles is considered to be one of the important ways to solve urban air pollution. At present, the "bottleneck" that restricts the large-scale commercial application of hydrogen fuel cell vehicles is the safe and efficient storage of hydrogen. Compared with high-pressure gaseous hydrogen storage and low-temperature liquid hydrogen storage, material-based solid-state hydrogen storage is considered to be a safer and more efficient hydrogen storage method. However, traditional metal hydrides and physical adsorption h...

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Problems solved by technology

[0004] Aiming at the problems of slow hydrogen desorption kinetics of ammonia borane at a mild temperature, the release of a large amount of impurity gas during the dehydrogenation process, and low hydrogen desorption capacity, the present invention provides an ammonia borane / magnesium hydride / heat conducting agent composite hydrogen storage material and its Preparation and dehydrogenation method, which achieves low-temperature and high-capacity dehydrogenation well through the comprehensive use of component optimization and dehydrogenation condition control

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