Enabling one-step regeneration of LiBH4 with self-sustaining hydrogen in its spent fuel—one pathway to storing renewable hydrogen

再生(生物学) 可再生能源 氢燃料 氢气储存 废物管理 燃料电池 材料科学 环境科学 化学 化学工程 工程类 细胞生物学 生物 有机化学 电气工程
作者
Kang Chen,Mi‐Li Liu,Zhuoyin Peng,Hao Zhong,Lang Gan,Jincheng Huang,Jinmin Zhao,Hui Wang,Jiangwen Liu,Huaiyu Shao,Liuzhang Ouyang
出处
期刊:Journal of Alloys and Compounds [Elsevier BV]
卷期号:987: 174209-174209
标识
DOI:10.1016/j.jallcom.2024.174209
摘要

LiBH4 (LB in short) with a hydrogen capacity as high as 18.5 wt% and a low molecular weight (21.78 g mol−1) is among the most promising candidates for the hydrogen-based economy. However, current major technologies in (re)generation of LB rely heavily on energy-intensive processes, which greatly prohibits practical scaling-up of applications. Here we report a sustainable and effective approach to (re)generate LB via converting renewable H+ in crystalline water into H-, achieving a desirable yield of ∼50%. This one-step synthesis method relies on the reaction between spent fuels, specifically LiBO2·xH2O, and Mg-based alloys to form LB under ambient atmosphere. Notably, our approach surpasses the efficiency of other conventional method, such as LiH-B-H2 and MgH2-LiBO2 systems, which not only bypasses the energy-intensive dehydration procedure of LiBO2·xH2O (∼470 ℃) but also eliminates the use of costly hydrides or high-pressure H2. Our findings indicate that Mg participated in the regeneration process prior to Al in Mg-Al alloys and [BH4]- is gradually evolved from other intermediate species [BHx(OH)4-x]- (x = 0, 1, 2, 3). By combining hydrogen release and efficient storage of hydrogen-rich substrate in a closed materials cycle, this study may shed light on a promising step toward application of renewable hydrogen in a fuel cell-based hydrogen economy.
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