【作者】 陈均； 付赫； 李伟； 郑捷； 李星国；

【Author】 Jun Chen;He Fu;Wei Li;Jie Zheng;Xingguo Li;College of Chemistry and Molecular Engineering, Peking University;

【机构】 北京大学化学与分子工程学院；

【摘要】 Mg以及MgH2与水的反应是一种很好的原位制氢方法,但是Mg(OH)2钝化层的存在阻碍了反应的顺利进行。之前的工作已经证实了MgCl2对Mg纳米颗粒的水解放氢具有促进作用[1]。和Mg相比,MgH2具有更高的放氢量(15.4%),本文研究了MgCl2对MgH2水解放氢的促进作用。以100-500 nm的纳米级MgH2颗粒为原料,在1 M的MgCl2溶液中,在20min内即达到MgH2的放氢理论值1723.8 ml/g。该体系的优势在于反应过程中溶液pH维持在9左右,因此可以保证不必更换溶液和持续产生氢气。实验结果表明:生成的Mg(OH)2沉淀不会影响反应速度,循环测试20次后,产氢速率仍然不受影响。MgH2纳米颗粒和MgCl2溶液反应提供了一种在室温和近中性的pH条件下高效持续的原位产氢的方法。更多还原

【Abstract】 The hydrolysis reaction of Mg or MgH2 is very convenient for on site hydrogen generation. However, the reaction of Mg or MgH2 with H2O is very slow at room temperature, due to the formation of the surface passivation Mg(OH)2 layer. In our previous work, it’s found that MgCl2 can significantly promote the hydrolysis of Mg[1]. In this work, we found that MgCl2 can also significantly promote the hydrolysis of MgH2. Compared with Mg, MgH2 has higher capacity of H2 generation. Using 100-500 nm MgH2 particles, near theoretical amount of H2(1723.8 ml/g) was released in 20 min in 1 M MgCl2 solution. The most notable advantage of this system is the constant composition of the solution, which allows continuous H2 generation without changing the solution. The MgH2-MgCl2 solution system is a highly effective, sustainable on situ H2 generation.更多还原