Magnesium hydride (MgH2) is one of the competitive hydrogen storage materials on account of abundant reserves and high hydrogen content. The hydrolysis of MgH2 is an ideal and controllable chemical hydrogen generation process. However, the hydrolyzed product of MgH2 is a passivation layer on the surface of the magnesium hydride, which will make the reaction continuity worse and reduce the rate of hydrogen release. In this work, hydrogen generation is controllably achieved by regulating the change of the surface tension value in the hydrolysis, a variety of surfactants were systematically investigated for the effect of the hydrolysis of MgH2 In the meantime, the passivation layer of MgH2 was observed by scanning electron microscope (SEM), and the surface tension value of the solution with different surfactants were monitored, investing the mechanism of hydrolysis adding different surfactants. Results show that different surfactants have different effects on hydrogen generation. The hydrogen generation capacity from high to low is as follows: tetrapropylammonium bromide (TPABr), sodium dodecyl benzene sulfonate (SDBS), Ecosol 507, octadecyl trimethyl ammonium chloride (OTAC), sodium alcohol ether sulfate (AES), and fatty methyl ester sulfonate (FMES-70). When the ratio of MgH2 to TPABr was 5 : 1, the hydrogen generation was increased by 52% and 28.3%, respectively, at the time of 100 s and 300 s. When hydrolysis time exceeds 80 s, the hydrogen generation with AES and FMES-70 began to decrease; it was reduced by more than 20% at the time of 300 s. SEM reveals that surfactants can affect the crystalline arrangement of Mg(OH)2 and make the passivation layer three-dimensionally layered providing channels for H2O molecules to react with MgH2.

中文翻译：

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界面控制水解氢化镁的研究

氢化镁（MgH2）储量丰富，氢含量高，是极具竞争力的储氢材料之一。MgH2的水解是一种理想的、可控的化学制氢过程。但MgH2的水解产物是氢化镁表面的钝化层，会使反应连续性变差，降低放氢速度。本工作通过调节水解过程中表面张力值的变化来可控地实现氢气的产生，系统研究了多种表面活性剂对MgH2水解的影响，同时通过扫描观察了MgH2的钝化层电子显微镜（SEM），监测不同表面活性剂溶液的表面张力值，投资水解机理加入不同的表面活性剂。结果表明，不同的表面活性剂对产氢的影响不同。制氢能力从高到低依次为：四丙基溴化铵（TPABr）、十二烷基苯磺酸钠（SDBS）、Ecosol 507、十八烷基三甲基氯化铵（OTAC）、醇醚硫酸钠（AES）、脂肪酸甲酯磺酸盐(FMES-70)。当MgH2与TPABr的比例为5:1时，在100 s和300 s时，产氢量分别增加了52%和28.3%。当水解时间超过80 s时，AES和FMES-70的产氢量开始减少；在 300 s 时减少了 20% 以上。