We report an efficient, convenient, solution-free method to achieve the room-temperature dehydrogenation of alkaline earth metal hydrides (MgH₂ and CaH₂). It is found, for the first time, that metal carbonates, which are readily available and cheap, can efficiently induce the hydrogen desorption of alkaline earth metal hydrides at room temperature under mechanical ball milling conditions. We demonstrate that the hydrogen yield and purity mainly depend on the nature of metal carbonates, rate and duration of ball milling, and reaction mixture composition. The best performances are obtained with the systems of MgCO₃-MgH₂ and MgCO₃-CaH₂ milled at 350 ​rpm for 12 ​h, with the CO_x-free hydrogen yield of 94% and 90%. This work opens a new way to achieve the efficient dehydrogenation of alkaline earth metal hydrides at room temperature.

我们报告了一种有效，方便，无溶液的方法，可实现碱土金属氢化物（MgH ₂和CaH ₂）的室温脱氢。首次发现，容易获得且廉价的金属碳酸盐可在室温下在机械球磨条件下有效诱导碱土金属氢化物的氢解吸。我们证明氢的产率和纯度主要取决于金属碳酸盐的性质，球磨的速率和持续时间以及反应混合物的组成。最好的性能与碳酸镁的系统中获得₃ -MgH ₂和碳酸镁₃ -CaH ₂以350rpm研磨12小时，用CO_无氢的_x产率分别为94％和90％。这项工作为在室温下实现碱土金属氢化物的高效脱氢开辟了一条新途径。