RARE METALS
·
2025
·
IF 11
Zhang Liang,He Zhi-Ling,Ning Hua,Luo Hui,Wei Qin-Qin,Qing Pei-Lin,Huang Xian-Tun,Wang Xin-Hua,Li Guang-Xu,Huang Cun-Ke,Lan Zhi-Qiang,Zhou Wen-Zheng,Guo Jin,Ismail Mohammad,Liu Hai-Zhen
As a hydrogen storage material, both AlH 3 and LiNH 2 possess a high hydrogen capacity. However, the dehydrogenated AlH 3 can hardly absorb hydrogen under normal conditions, while LiNH 2 will generate NH 3 rather than H 2 upon decomposition. In this work, we report that the combination of AlH 3 and LiNH 2 through simple ball milling leads to partial reversibility of the AlH 3 −LiNH 2 system and the suppression of NH 3 liberation. The negatively charged H δ − in AlH 3 will react with the positively charged H δ + in LiNH 2 through a redox reaction to form Li 2 NH, AlN, and H 2 at 120−170 °C. After dehydrogenation at above 270 °C, Li 3 AlN 2 is generated, which is crucial for the reversibility of this system. The more the Li 3 AlN 2 generated, the better the reversibility of this system. The dehydrogenation capacity of AlH 3 + 2LiNH 2 at the third cycle (3.0 wt%) is higher than that of AlH 3 + LiNH 2 (1.2 wt%) due to the generation of more Li 3 AlN 2 . The role of AlH 3 /Al in the AlH 3 −LiNH 2 system is to fix the nitrogen into the form of AlN and Li 3 AlN 2 and thus suppress the liberation of NH 3 . Therefore, the synergy of AlH 3 and LiNH 2 leads to the reversibility of the Li–Al–N–H system and the suppression of NH 3 . Graphical abstract
研究领域:
材料科学
·
化学
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2023
·
IF 9.5
Ming-Hui Yu,RuiXuan Xu,Wu-Xi Xie,Ya-Jin Li,Hong-Qi Nie,Qi-Long Yan
Aluminum hydride (AlH3) has attracted much attention due to its potential to replace aluminum (Al) as a novel energetic material in solid propellants. In this research, ammonium perchlorate (AP) and perfluoropolyether (PFPE) as functionalized coatings and a combination of acoustic resonance and spray drying technology have been employed to prepare AlH3@Al@AP (AHAPs) and AlH3@Al@AP@PFPE (AHAPs-F) energetic composite particles. The formulations of composite propellants and modified AlH3 particles were designed and fabricated. Their thermal reactivity, reaction heat, density, vacuum stability, combustion performance, and condensed combustion products (CCPs) have been systematically investigated. The results show that the solid propellants containing AHAPs (SP13) and AHAPs-F (SP14) composites can significantly enhance the reactivity and energy output compared to conventional solid propellants with the mechanical mixture Al/AlH3 (SP12). In particular, the total heat releases of SP13 and SP14 are almost 1.2 and 1.7 times higher than those of conventional ones (SP12, 1442 J g–1), respectively. Among the AlH3-based propellants, SP14 propellants exhibit the highest reaction heat of 5887 J g–1, the most intensive flame radiation of 31.4 × 103, and the highest combustion wave temperature of 2495 °C. Moreover, the particle size distribution of CCPs from SP14 propellants is much narrower and smaller than that of SP12, resulting in higher combustion efficiency.
研究领域:
材料科学
·
能源工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
FirePhysChem
·
2024
·
IF 0
Jiashuai Wang,Bo Wu,Lingfeng Yang,Yuan Bian,Renjie Li,Ke Zeng,Juan Zhu,Liangyou Zhao,Jinpeng Shen,Chonghua Pei
Thermites are widely used in propellants, explosives and ignition materials because of their high heat release rate and good combustion efficiency. Structural control over thermites to achieve improved performance leads to a promising research area. Among these, core-shell structured composites have attracted wide attention due to their excellent properties and close contact among components. Herein, core-shell structured α -AlH 3 /Fe 2 O 3 thermites were prepared, which exhibit high heat-release and excellent combustion performance. At an equivalence ratio of 2.0, the core-shell structured α -AlH 3 /Fe 2 O 3 has the most heat release (1213.8 J/g) and the lowest reaction activation energy (147.5 kJ/mol). The ignited combustion performance of α -AlH 3 /Fe 2 O 3 was notably strengthened by the shorter ignition delay period (11 ms). Interestingly, the core-shell structured α -AlH 3 /Fe 2 O 3 was less sensitive to electrostatic discharge, which suggests that the core-shell structured α -AlH 3 /Fe 2 O 3 reaches the goal of high energy release and electrostatic safety. The core-shell thermite system with α -AlH 3 as metal fuel could provide an efficient alternative to hunt for thermites with high reactivity.
研究领域:
材料科学
·
化学工程
·
能源技术
✓ 已验证
DOI
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
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2016
·
IF 3.205
Jiaguang Zheng,Xuezhang Xiao,Liuting Zhang,Yan He,Shouquan Li,Hongwei Ge,Lixin Chen
Mg(BH 4 ) 2 has been considered as one of the promising light metal complex hydrides due to its high hydrogen capacity and low cost. But its higher thermal stability (dehydrogenation at above 300 °C) needs to be improved for the practical application. In this study, the aluminum hydride AlH 3 was introduced into complex borohydride Mg(BH 4 ) 2 to synthesize a new Mg(BH 4 ) 2 AlH 3 composite by ball milling method. It is found that the active Al ∗ formed from the self-decomposition of AlH 3 can effectively improve the dehydrogenation properties of Mg(BH 4 ) 2 , the Mg(BH 4 ) 2 AlH 3 composite starts to release hydrogen at 130.8 °C with a total hydrogen capacity of 11.9 wt.%. The dehydrogenated products of the composite is composed of Mg 2 Al 3 and B at 350 °C, resulting in the improved hydrogen desorption properties of Mg(BH 4 ) 2 AlH 3 composite. The Mg 2 Al 3 and B products would be further transformed into MgAlB 4 and Al at 500 °C. Moreover, the Mg 2 Al 3 and B dehydrogenated products show better reversible hydrogen storage property than that of the MgAlB 4 and Al products. This research shows a way to alter hydrogen de/hydrogenation route and reversibility of Mg(BH 4 ) 2 complex hydride by compositing with AlH 3 and controlling the dehydrogenation temperature.
研究领域:
材料科学
·
能源化学
✓ 已验证
DOI
高影响因子
Journal of Nanomaterials
·
2015
·
IF 1.644
Jun-qin Wang,Jian-feng Gao,Zhi-gang Wu,Guo-li Ou,Yu Wang
The research on hydrogen generation and application has attracted widespread attention around the world. This paper is to demonstrate that sodium aluminum hydride can be synthesized under simple and mild reaction condition. Being activated through organics, aluminum powder reacts with hydrogen and sodium hydride to produce sodium aluminum hydride under atmospheric pressure. The properties and composition of the sample were characterized by FTIR, XRD, SEM, and so forth. The results showed that the product through this synthesis method is sodium aluminum hydride, and it has higher purity, perfect crystal character, better stability, and good hydrogen storage property. The reaction mechanism is also discussed in detail.
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
NEW JOURNAL OF CHEMISTRY
·
2021
·Vol. 46
·期 4
·1643-1649
·
IF 3.591
Zhe Shi,Taojie Lu,Jian Zhang,Zhaoyang Zhu,Yidong Xu,Debin Xia,Yinghui Hu,Kaifeng Lin,Yulin Yang
Alpha-aluminum hydride (α-AlH3) is an excellent high-energy additive for solid propellants because of its high hydrogen content (10.8 wt%) and energy density, low decomposition temperature, and good combustion performance. However, the application of α-AlH3 is limited by its poor thermal stability and hygroscopicity. In this work, we present a facile method to improve the thermal stability and hygroscopicity of α-AlH3 by coating the α-AlH3 surface with an organic layer using vinyltrimethoxysilane (A171). The α-AlH3@A171 composite shows enhanced performance in terms of thermal stability and hygroscopic properties. In the constant temperature experiments at 100 °C, the required time to lose 1% mass of α-AlH3@A171 is 561.5 minutes, showing excellent stability. More importantly, the resulting α-AlH3@A171 composite exhibits an increased activation energy of 4.32 kJ mol−1 after stabilization. Furthermore, the α-AlH3@A171 composite also shows excellent performance in resisting water erosion, and the hydrophobic angle increases from 24.23° to 96.94° after the organic layer is coated on the α-AlH3 surface. The hygroscopic weight gain of α-AlH3@A171 was only 0.89% when stored at 30 °C and 80% relative humidity for 30 days, which was lower than that of α-AlH3 (23.1%). This work provides a convenient method for the safe application of α-AlH3 in the field of solid propellants.
研究领域:
材料科学
·
化学工程
✓ 已验证
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2024
·
IF 8.3
Zhoufeng Jiang,Fengqi Zhao,Zhao Qin,Yi Xu,Ying Wang,Yi-Fan Jiang,Ting An,Wengang Qu,Ming Zhang,Hexin Liu,Bingbing Zhang,Lianghua Xiong
AlH3 has gained considerable attention as a fuel additive due to its ability to offer high specific impulse and superior combustion performance. However, few studies have focused on the fragmentation and agglomeration behavior of AlH3. This study investigated the effects of fragmentation of AlH3 and AlH3/PVDF particles on the thermal decomposition, ignition, agglomeration, and combustion of HTPB propellants. Thermal analysis indicated that AlH3 and AlH3/PVDF can accelerate the decomposition of ammonium perchlorate by abundant active sites for the adsorption of the decomposition intermediates. Single-particle combustion uncovered the mechanism behind the directional spray of molten Al from the AlH3 particle and the fragmentation of the AlH3/PVDF particle. The melting of porous Al induces particle shrinkage due to solid–liquid interfacial tension and the structural restoration of the oxide shell, which consequently results in the sealing of cracks in the oxide shell of AlH3. Additionally, the accumulation of internal tensile stress leads to the reopening of these cracks and the directional ejection of the molten Al. The flexible oxide shell contributes to a smaller minimum normalized diameter of the AlH3/PVDF particle, aiding in the generation of internal tensile stress, while the sublimation of AlF3 induced the fragmentation. Synchrotron-based X-ray imaging revealed the formation of aggregates promoted by molten Al, the splitting of AlH3 aggregates due to hydrogen explosion, and the enhanced fragmentation of AlH3/PVDF due to the synergistic effect of hydrogen explosion and the sublimation of AlF3. Compared to raw particles, the CCPs (condensed combustion products) of SP2 propellant display a 48% reduction in average size (D50 = 24.5 μm), whereas there is an over 89% decrease in particle size for the CCPs of SP3 propellant (D50 = 5.14 μm). This study contributes to understanding the fragmentation of AlH3 and AlH3/PVDF upon ignition and combustion, providing valuable insights for the development and optimization of propellants containing AlH3.
研究领域:
材料科学
·
燃烧学
·
推进剂工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
CATALYSIS TODAY
·
2017
·
IF 4.636
Yanping Fan,Zhenluo Yuan,Guodong Zou,Qingrui Zhang,Baozhong Liu,Qiuming Peng
Differing from graphene with a carbon element component, analogous metallic-graphene two-dimensional layered titanium carbide (2D MXene) provides more opportunities to achieve better surface functionalization. Herein, a thin layered 2D MXene/A-TiO 2 composite was prepared by chemical exfoliation and hydrothermal decomposition. The 2D MXene/A-TiO 2 composite exhibits high catalytic activity in the adsorption and desorption of hydrogen kinetics for NaAlH 4 . The critical dehydrogenation temperature of NaAlH 4 is ∼90 °C. The first-stage dehydrogenation (∼3.0 wt.%) is accomplished in 50 min at 110 °C. After the first activated cycle, a constant cycling capacity of 4.7 wt.% is remained for a minimum of five cycles tests. It is found that the excellent catalytic activation should be ascribed to the synergistic effect between homogenous distributed Ti-H and TiC, which are originated from MXene/A-TiO 2 . The results represent a new step forward in the applications of MXene catalytic dehydrogenation and provide new strategies in the quest for new functional MXene derivatives by in-situ modification.
研究领域:
材料科学
·
催化化学
✓ 已验证
DOI
高影响因子
Journal of Materials Chemistry A
·
2019
·Vol. 7
·期 9
·4651-4659
·
IF 10.733
Xin Zhang,Zhuanghe Ren,Xuelian Zhang,Mingxia Gao,Hongge Pan,Yongfeng Liu
Highly stable catalytic activity of metallic Ti and corresponding mechanistic understanding are of particularly critical importance for the development of sodium alanate (NaAlH4) as an advanced on-board hydrogen storage medium. However, only limited catalytic effectiveness is observed for commercial metallic Ti powders due to their ductile behavior limiting the dispersion of large particles. Here, we successfully synthesize ultrafine metallic Ti nanoparticles (3–5 nm) supported on amorphous carbon (nano-Ti@C) through a facile, scalable calcination process. Unlike commercial metallic Ti powders, the nano-Ti@C exhibits remarkable catalytic activity for hydrogen storage in NaAlH4, superior to other reported transition metals and rare earth metals. The 7 wt% nano-Ti@C-containing NaAlH4 sample delivers a quite low onset temperature of dehydrogenation of 75 °C and a practically available hydrogen capacity as high as 5.04 wt%. Reloading of hydrogen is fully completed in <3 min at 100 °C and 120 bar H2; this sorption kinetics is fastest among all catalytically enhanced NaAlH4 systems known. Moreover, only 0.07 wt% of hydrogen capacity is lost after 100 cycles, exhibiting a highly stable cyclability. Theoretical calculations reveal the interaction between Ti and Al, which not only weakens the Al–H bonding but also facilitates diffusion of H in NaAlH4, contributing to the superior catalytic activity of nano-Ti@C. Our findings greatly increase potentials towards practical applications of catalyst-doped NaAlH4 for onboard hydrogen storage.
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
PROPELLANTS EXPLOSIVES PYROTECHNICS
·
2015
·Vol. 40
·期 6
·914-919
·
IF 1.604
Xing Wang Cai,Ji Hua Yang,Jing Lin Zhang,Do Xu Ma,Yan Ping Wang
This paper presents a novel surface coating to resolve the serviceability, stability, compatibility, and dehydrogenation of aluminum hydride (alane) using liquid carbon dioxide as an anti-solvent, dispersant, drying medium, and inert atmosphere. The coated alane sample was characterized by SEM, XPS, XRD, and FT-IR spectroscopy. The coating agent was uniformly applied on the surface of alane and the crystalline phase remained unchanged. The alane molecules became more stable after coating. The thermal stability of alane before and after coating was analyzed by DSC. The enthalpy of the coated alane increased under different heating rates, indicating increased thermal stability. The lower electric spark sensitivity of the coated alane showed improved serviceability and stability. The method developed in this study may be suitable for coating other hydrogen storage and energetic materials.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2018
·
IF 3.779
Jiaguang Zheng,Xuezhang Xiao,Yan He,Man Chen,Meijia Liu,Shouquan Li,Lixin Chen
The Mg(BH 4 ) 2 -AlH 3 - x LiH ( x = 0, 0.5, 1) novel ternary composites have been synthesized through mechanical ball milling, their favorable dehydrogenation properties and mechanism have been experimentally investigated. It can be found that during ball milling, a slight amount of Mg(BH 4 ) 2 would react with LiH and transform into LiBH 4 , while most Mg(BH 4 ) 2 remained stable after ball milling. Two major dehydrogenation steps can be detected in the Mg(BH 4 ) 2 -AlH 3 - x LiH composite, which belong to the decomposition of AlH 3 and Mg(BH 4 ) 2 , respectively. Remarkably, the onset hydrogen desorption temperature of Mg(BH 4 ) 2 -AlH 3 - x LiH composite can be reduced to 125.9 °C, with a total hydrogen desorption capacity of 10.3 wt%. It is worth emphasizing that the reversible dehydrogenation capacity is obviously improved to 3.8 wt%, compared to the Mg(BH 4 ) 2 -AlH 3 composite. This reversible capacity can be held for 3 cycles without obvious degeneration. Microstructural analysis on de/rehydrogenated composite has identified the regeneration of [BH 4 ] - in Mg(BH 4 ) 2 -AlH 3 -0.5LiH composite and revealed the role of LiH in the cycling hydrogen desorption and absorption processes. The formation of LiBH 4 and MgH 2 resulted from the rehydrogenation between MgAlB 4 and LiH could be helpful for the stability of reversible hydrogen storage performance.
研究领域:
材料科学
·
能源存储
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）