Efficient hydrogen release from LiBH4 alcoholysis in methanol/ethylene glycol based solutions over a wide temperature range
作者:
Chen, K (Chen, Kang) [1] ; Liu, ML (Liu, Mili) [1] ; Ouyang, LZ (Ouyang, Liuzhang) [1] , [2] ; Wang, H (Wang, Hui) [1] ; Liu, JW (Liu, Jiangwen) [1] ; Zhu, M (Zhu, Min) [1] , [2]
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卷905
文献号164030
DOI10.1016/j.jallcom.2022.164030
出版时间JUN 5 2022
已索引2022-04-26
文献类型Article
摘要
Hydrolysis of LiBH4 (LB in short) is considered as a potential means of releasing the hydrogen stored in the hydride and the water. However, the hydrolysis of LB occurs only above 0 degrees C and efficient catalysts are required to accelerate the hydrogen kinetics. Here, we demonstrate an efficient non-catalytical hydrogen generation system that enables H2 production of LB over a wide range of temperatures with methanol (referred to MeOH), ethylene glycol, and MeOH/water mixtures as reaction solvents. The results indicate that the hydrogen kinetics of LB is controllable by MeOH dose, MeOH species, reaction temperature, and solution components. For instance, the hydrogen evolution rate could be accelerated from 266 to 515 mLH2 min-1 g-1 (per unit weight of LB) with a H2 yield up to 93% by tailoring the dose of methanol at 25 degrees C. Notably, the glycolysis kinetics is much faster than that for the methanolysis of LB, delivering a hydrogen rate varying from 523 to 10,125 mLH2 min-1 g-1. By optimizing reaction conditions, a gravimetric hydrogen density of ~4.6 wt% H2 was realized in the LB-MeOH system. Interestingly, the methanolysis/glycolysis products of LB can spontaneously convert into MeOH and hydrated byproduct (LiBO2.2H2O) by reacting with water, and MeOH may be separated and reused as an intermediate. Here, LiBO2.2H2O can be easily regenerated back to LB by ball milling with Mg under ambient conditions. Thus, a hydrogen cycle combining hydrogen generation and storage in a closed material cycle is achieved, which may lay the foundation for developing practical hydrogen sources for mobile/portable applications. (c) 2022 Elsevier B.V. All rights reserved.
关键词
作者关键词Hydrogen releaseLithium borohydrideAlcoholysisMethanolEthylene glycol
Keywords PlusSODIUM-BOROHYDRIDEGENERATIONHYDROLYSISSTORAGEREGENERATIONWATER
作者信息
通讯作者地址
Ouyang, Liuzhang
(通讯作者)
South China Univ Technol, Sch Mat Sci & Engn, Guangdong Prov Key Lab Adv Energy Storage Mat, Guangzhou 510641, Peoples R China
地址
1 South China Univ Technol, Sch Mat Sci & Engn, Guangdong Prov Key Lab Adv Energy Storage Mat, Guangzhou 510641, Peoples R China
2 China Australia Joint Lab Energy & Environm Mat, Key Lab Fuel Cell Technol Guangdong Prov, Guangzhou 510641, Peoples R China
电子邮件地址meouyang@scut.edu.cn
类别/分类
研究方向ChemistryMaterials ScienceMetallurgy & Metallurgical Engineering