MgH2-based hydrogen storage composite and preparation method thereof

Abstract

The invention discloses an MgH2-based hydrogen storage composite and a preparation method thereof. The MgH2-based hydrogen storage composite is characterized in that an Fe-based metal organic framework compound Fe-Mill-88B-NH2 serves as an additive and is compounded with Mg-based hydride MgH2 to obtain the MgH2-based hydrogen storage composite of which the chemical ingredient is MgH2-(xwt% Fe-Mill-88B-NH2), wherein x ranges from 5 to 15. The preparation method mainly comprises the following steps: mixing Fe-Mill-88B-NH2 and MgH2 at the mass ratio of (5:100)-(15:100), and performing ball-milling on the mixture under a vacuum, an inert gas protection or hydrogen atmosphere condition, wherein the rotational speed of a ball mill is 800-1000 r / min, the ball-to-powder weight ratio is (30:1)-(50:1), the ball-milling time is 4-6 h, and the ball mill stops for a rest for 15-30 min every 1 h of ball milling. The obtained MgH2-based hydrogen storage composite comprehensively utilizes the dual effects of structural confinement of Fe-Mill-88B-NH2 to MgH2 and catalytic hydrogen release of metal Fe ion to MgH2, so that MgH2 particles / crystals are refined, the hydrogen release temperature is remarkably reduced, the preparation process and equipment are simple, the energy consumption is low, the cost is low and the application prospect is ideal.

Description

technical field [0001] The invention relates to the field of hydrogen storage materials, in particular to a MgH 2 Based hydrogen storage composite material and its preparation method. Background technique [0002] In the "post-crude oil" era of automobiles, hydrogen fuel cell vehicles and metal ion battery vehicles have begun fierce competition. In the short term, due to the relatively simple manufacturing process and mature technology of lithium-ion batteries, it has become the choice of most automobile companies and consumers. But in the long-term future, using inexhaustible water resources to produce clean hydrogen energy is an inevitable choice for human development and an ideal way to solve the human energy crisis. At present, the research bottleneck in the utilization of hydrogen energy in the scientific community is mainly how to prepare solid-state hydrogen storage materials that absorb and release hydrogen at a lower temperature, faster rate, and higher hydrogen s...

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Problems solved by technology

Therefore, there is no lack of MOFs as a way to improve MgH 2 Effective additive for hydrogen release properties

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