LiAlH4 as a "Microlighter" on the Fluorographite Surface Triggering the Dehydrogenation of Mg(BH4)(2): Toward More than 7 wt % Hydrogen Release below 70 degrees C
LiAlH4 as a "Microlighter" on the Fluorographite Surface Triggering the Dehydrogenation of Mg(BH4)(2): Toward More than 7 wt % Hydrogen Release below 70 degrees C
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LiAlH4%20as%20a%20"Microlighter"%20on%20the%20氟石墨%20Surface%20触发%20the%20脱氢%20of%20Mg(BH4)(2):%20走向%20更多%20比%207%20wt%20%%20氢气
DOI：
10.1021/acsaem.0c00134
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发表时间：
2020
影响因子：
6.4
通讯作者：
Chen Lixin
中科院分区：
文献类型：
--
作者：
Zheng Jiaguang;Cheng Hao;Wang Xuancheng;Chen Man;Xiao Xuezhang;Chen Lixin
Mg(BH4)2是最有前途的储氢氢化物之一。其中，添加lialh2o和氟石（FGi）显著改善了Mg(BH4)2的脱氢性能。FGi强烈阻碍了Mg(BH4)2与lialh4的还原反应，并观察到一种新的“巧克力饼干”结构，Mg(BH4)2和lialh4颗粒均匀地分散在FGi表面。在低至68.2℃的温度下，Mg(BH4) 2-LiAlH4-30FGi复合材料的氢解吸能力达到了7.12 wt %。更令人鼓舞的是，快速脱氢过程可以在几秒钟内完全完成，表明超快的氢脱附动力学行为。进一步研究发现，脱氢行为的显著增强是由于FGi与两种氢化物的相互作用，这大大降低了脱氢反应的焓变。研究表明，lialh4可以作为“微打火机”，在低温下触发Mg(BH4)2脱氢。
Mg(BH4)2is one of the most promising hydrides for hydrogen storage. Herein, the dehydrogenation properties of Mg(BH4)2are significantly improved by LiAlH4and fluorographite (FGi) addition. The metathesis reaction between Mg(BH4)2and LiAlH4has been strongly hindered by FGi, and a novel “chocolate cookie” structure is observed that Mg(BH4)2and LiAlH4particles scatter uniformly on the FGi surface. An unexpected hydrogen desorption capacity of 7.12 wt % is discovered in the Mg(BH4)2–LiAlH4–30FGi composite at a temperature as low as 68.2 °C. More encouragingly, the rapid dehydrogenation process can be fully accomplished in seconds, indicating an ultrafast hydrogen desorption kinetic behavior. Further investigations find that the remarkably enhanced dehydrogenation behavior is attributed to the interaction between FGi and the two hydrides, which greatly reduces the enthalpy change of the dehydrogenation reaction. This investigation reveals that the LiAlH4can act as a “microlighter” to trigger the dehydrogenation of Mg(BH4)2at low temperature.