INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2026
·
IF 9.2
Shiming Xu,Jintang Duan,Lianfang Feng,Xueping Gu,Cailiang Zhang,Liu Liu
The widespread implementation of hydrogen energy is critically constrained by the challenge of storage. Aluminum hydride (α-AlH 3 ), a binary hydride stable under ambient conditions with high volumetric hydrogen density, represents a promising candidate. However, when it is traditionally prepared from lithium aluminum hydride (LiAlH 4 ) and aluminum chloride (AlCl 3 ), the process is cost-prohibitive for scale-up. This study presents a cost-effective synthesis strategy by systematically investigating the effects of different molar ratios of LiAlH 4 /NaAlH 4 /AlCl 3 (4:0:1, 1:3:1, 0.5:3.5:1, 0:4:1). Results indicate that the introduction of LiAlH 4 significantly enhances reaction efficiency and kinetics. The optimal ratio of 1:3:1 effectively compensated for the slower kinetics of NaAlH 4 , achieving over 94% conversion of AlCl 3 to AlH 3 ·nEt 2 O etherate. Desolvation studies revealed that AlH 3 ·nEt 2 O derived from NaAlH 4 required higher temperatures for complete phase transformation, whereas systems with LiAlH 4 content below 25% were insufficient to effective desolvation. The α-AlH 3 crystals produced from the 1:3:1 ratio exhibited a well-defined cubic morphology and high thermal stability, with a decomposition temperature of 165 °C. By replacing 75% of the costly LiAlH 4 with NaAlH 4 , this hybrid approach achieved an approximately 50% reduction in the material cost. These findings provide critical process parameters and a viable pathway for the cost-effective, large-scale production of high-performance α-AlH 3 for hydrogen storage applications.
✓ 已验证
产品关联
DOI
高影响因子
FUEL
·
2025
·
IF 7.5
Deyu Tang,Qinan Wu,Jiaguang Zheng,Ao Xia,Zhenxuan Ma,Zhendong Yao,Chao Su
Lithium aluminum hydride (LiAlH 4 ) has been acknowledged as a vital solid-state hydrogen storage material with its large dehydrogenation capacity of 10.6 wt%. However, pure LiAlH 4 was hard to release hydrogen under 120 ℃, which strongly hindered its practical application. In this study, solid-state fluorinated acetylene black (FAB) was used as an additive to destabilize LiAlH 4 . According to the experimental results, FAB-doped LiAlH 4 could achieve an ultrafast one-step hydrogen release over 6 wt% hydrogen release, which could be fully accomplished below 60 ℃, showing a great potential to be used as an easy hydrogen source. Through the microstructural study, it was found that FAB nano-sized particles adhered to the surface of LiAlH 4 . Then this structure increased the activation sites, and triggered the fast heat emission and hydrogen release of LiAlH 4 during the dehydrogenation process. Moreover, the dehydrogenation reaction path was changed by the doping of FAB, which greatly lowering the dehydrogenation enthalpy change of LiAlH 4 . This study provides some inspiration for the utilization of LiAlH 4 as an easy one-time hydrogen source under moderate environment.
研究领域:
材料科学
·
氢能
·
固态化学
✓ 已验证
产品关联
DOI
高影响因子
ENERGY & FUELS
·
2024
·
IF 5.2
Na Yang,Fanqi Bu,Mengyue Gu,Yonghong Cheng,Jinying Zhang
The hydrolysis of LiAlH4 is a feasible path to supply hydrogen at subzero temperatures due to its high hydrolysis reactivity and hydrogen purity. However, the extremely fast hydrolysis reaction of LiAlH4 hindered its practical application due to its kinetic instability and safety risks caused by the exothermic effect of the reaction. Herein, hydrophobic graphene nanosheets (GNS) have been coated on the surfaces of LiAlH4 particles (LiAlH4@GNS composites) to slow the hydrolysis kinetics of LiAlH4, especially at subzero temperatures. The GNS coating processes have been found to introduce not only GNS coating but also fragmentation of LiAlH4 particles. The coating process was found to hinder the hydrolysis reaction of LiAlH4 with increasing GNS coating to 3.82 wt %, while the hydrolysis of LiAlH4 was found to increase with further GNS coating process due to significant fragmentation effects. The hydrolysis speeds of LiAlH4@GNS (D50 = 100 μm, Dδ = 1.30) with GNS coating (∼3.82 wt %) have been demonstrated to be reduced to 70% of that of pristine LiAlH4, where the conversion rates were found to be still higher than 99.0% at −40 to 0 °C. The GNS coating is considered to serve as a barrier to hinder the free diffusion of H2O molecules toward the reaction interface at the initial stage of the reaction, resulting in longer induction periods of the composites than those of pristine LiAlH4. The hydrolysis of LiAlH4@GNS has been demonstrated to follow the shrinking core model controlled by liquid film diffusion, where the GNS coating plays an important role in extending the diffusion distance and reducing the diffusion efficiency of substances within the liquid film layer.
研究领域:
材料科学
·
氢能
·
纳米材料
·
化学动力学
✓ 已验证
DOI
高影响因子
JOURNAL OF MATERIALS SCIENCE & TECHNOLOGY
·
2024
·
IF 11.2
Guorong Zhang,Jiaxi Liu,Sheng Wei,Fen Xu,Lixian Sun,Yongpeng Xia,Hehui Wang,Jinfan Wu,Yuan Gao,Qiwei Shao,Yiting Bu,Yanxun Guan,Lumin Liao,Taigen Liang,Lina Qin
Herein, a novel TiO 2 /CN heterojunction material has been prepared by one-step bubble template-assisted calcination to enhance the hydrogen storage capability of LiAlH 4 . The TEM, XPS and UPS analysis confirm that a heterostructure is formed between TiO 2 and g-C 3 N 4 successfully. The experimental findings indicate that the TiO 2 /CN significantly enhances the dehydrogenation performance of LiAlH 4 . For instance, the LiAlH 4 -7 wt% TiO 2 /CN starts to dehydrogenize at 76 °C (94 °C less than pure LiAlH 4 ) and releases 6.5 wt% H 2 at 200 °C. Meanwhile, LiAlH 4 -7 wt% TiO 2 /CN releases 4.9 wt% H 2 at 120 °C within 50 min. The mechanism analysis illustrates that AlTi 3 N is formed in situ during ball-milling. And density functional theory (DFT) calculation results reveal that the AlTi 3 N can weaken the Al-H bonds in LiAlH 4 through interfacial charge transfer. Furthermore, the TiO 2 /CN heterostructure creates an internal electric field that generates an electron-rich layer. As a result, the negative electron layer at one end of the TiO 2 /CN heterojunction has an increased affinity for H, which enhances the dehydrogenation reaction of LiAlH 4 . Clearly, both the TiO 2 /CN heterostructure and AlTi 3 N contribute to the improvement of the dehydrogenation properties of LiAlH 4 .
研究领域:
材料科学
·
能源化学
✓ 已验证
产品关联
DOI
高影响因子
Journal of Physical Chemistry C
·
2018
·
IF 4.484
Yiwen Zhang,Xuezhang Xiao,Bosang Luo,Xu Huang,Meijia Liu,Lixin Chen
A significant improvement in reversible de/rehydrogenation properties of MgH2 doped with 2.5 wt % LiAlH4 and 2.5 wt % LiBH4 additives is achieved by reactive ball milling. Careful comparison studies show that a small amount (total mass ratio of ≤5 wt %) of LiBH4 and/or LiAlH4 can improve the hydrogen desorption performance of MgH2 in terms of reducing hydrogen desorption temperature, enhancing hydrogen desorption kinetics, and increasing hydrogen capacity. In particular, the MgH2 co-doped with LiAlH4–LiBH4 exhibits the best dehydrogenation properties, which starts to release hydrogen at about 280 °C and releases a high hydrogen capacity of 7.62 wt % with superior reaction kinetics. The activation energy of hydrogen desorption is decreased from 187.8 kJ/mol (ball-milled MgH2) to 155.8 kJ/mol. It can also uptake 7.7 wt % H2 within 15 min at 300 °C with a stable hydrogen absorption kinetics in the first 10 cycles. This synergistic effect of LiBH4 and LiAlH4 additives on improved hydrogen absorption/desorption properties is attributed to the in situ formation of Li3Mg7, Mg17Al12, and MgAlB4 new phases acting as the “catalytic active sites” to facilitate the diffusion of hydrogen through the reaction barriers in the de/hydrogenation cycles of MgH2. Moreover, these new phases can be rehydrogenated into MgH2, LiBH4, and Li3AlH6 hydrides, which further enhance the hydrogen capacity of co-doped sample more than the theoretical capacity of primitive MgH2.
研究领域:
材料科学
·
氢能
·
固态化学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）