Journal of Energy Chemistry
·
2019
·
IF 5.162
Jun Chen,F. Xu,L. Sun,Kexiang Zhang,Yongpeng Xia,Xiaolei Guo,Huanzhi Zhang,Fang Yu,Erhu Yan,Hongliang Peng,Pengru Huang,Shujun Qiu,Cuili Xiang,Yujie Sun
In this work, Ni-Bi-B alloy has been synthesized via chemical synthesis method . A new kind of Al-InCl 3 -(Ni-Bi-B) composite has been prepared by high energy mechanical ball grinding Al powder with additives. Results show that the doped Ni-Bi-B alloy can significantly improve the hydrogen generation performance of Al-InCl 3 and the catalytic activity is enhanced with the increasing content of Bi in Ni-Bi-B alloy. Under optimal conditions, the hydrogen generation yield and conversion yield of Al-InCl 3 -(Ni-Bi-B) reached 1196.8 mL g −1 and 100.0% at room temperature, respectively. Mechanism study shows five kinds of active sites, such as the fresh surface/defect of Al particle , Al-AlCl 3 , Al-In, Al-Bi/B and Al-Ni/B produced during the ball milling process. Their synergistic effect enhances the hydrogen generation performance of Al-InCl 3 -(Ni-Bi-B) remarkably. In general, the proposed Al-InCl 3 -(Ni-Bi-B) composite is possible to serve as hydrogen generation material for fuel cells.
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高影响因子
FirePhysChem
·
2023
·
IF 0
Jun Wang,Jie Chen,Wei Cao
Introducing additional oxidizers in aluminized explosives is an effective way to improve energy performance by enhancing the secondary combustion reaction. In this work, perfluorocarbon as oxidizer has been introduced into TATB/Al based energetic materials to improve combustion reaction and energy output performance. The uniform TATB/Al/perfluorocarbon composites are prepared through acoustic resonance mixed technology, and the energy and pressure output performance are fully studied in air blast and underwater explosion. A significantly exothermic peak derived from the reaction between fluorine and Al is observed between 540 and 580℃ for TATB/Al/perfluorocarbon. The heat of explosion of TATB/Al/perfluorocarbon is increased first and then decreased with F/Al ratio from 0 to 0.608. The highest heat of explosion is 6021 J/g for TATB/Al/perfluorocarbon with F/Al ratio of 0.274. Furthermore, the enhanced working capacity, the significantly enlarged fireball and relatively high overpressure are obtained for TATB/Al/perfluorocarbon. More importantly, the shock impulse and first bubble oscillation time of TATB/Al/perfluorocarbon have been increased by 23.2% and 21.18% during underwater explosion, respectively. The results further illustrate that adding perfluorocarbon is a feasible approach to enhance energy output due to combustion reaction between fluorine and Al, which can be applied in explosives and propellants.
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THERMOCHIMICA ACTA
·
2019
·
IF 2.251
Jun Wang,Chengcheng Zeng,Chunhong Zhan,Long Zhang
Nanoenergetic composites composed of polytetrafluoroethylene (PTFE) and fuel (Aluminum) have potential applications in the military and civilian fields owing to high energy density and exothermic reaction. Herein, the ignition, energy output and combustion characteristics of Al/PTFE were tuned by employed carbon nanotubes (CNTs) and graphene based on high thermal conductivity. The highest output energy and combustion speed of PTFE/Al with 3 wt% CNTs are 3158 J/g and 397 m/s, respectively, which are higher than that of PTFE/Al (2106 J/g and 260 m/s) and PTFE/Al with graphene (2201 J/g and 286 m/s). The onset reaction temperature and ignition delay time of PTFE/Al with 3 wt% CNTs are reduced by 80 °C and 0.21 ms, respectively. Furthermore, the flame structure of PTFE/Al with graphene is significantly changed from semicircle to spiculate. This work provides efficient approach to improve reactivity and combustion properties and understand the heat transfer in combustion reaction process of PTFE/Al.
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高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2020
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IF 4.939
Chen Chen,Xu Guan,Hongbo Wang,Shijie Dong,Ping Luo
In this paper, a novel Al–Bi(OH) 3 system hydrogen-generating material is investigated. Hydrolysis experiments show that the hydrolysis properties of the Al–10 wt% Bi(OH) 3 composite are significantly improved by doping with sodium chloride, and the Al–10 wt% Bi(OH) 3 –5 wt% NaCl composite has a low activation energy (10.4 kJ mol −1 ). With the further optimization of milling time, the hydrogen yield of Al–10 wt% Bi(OH) 3 –5 wt% NaCl composite reaches 1000 mL g −1 in 1 min. X-ray diffraction, X-ray photoelectron spectroscopy, scanning electron microscopy, energy-dispersive spectroscopy and thermogravimetric analysis are applied to characterize the composite and explore the hydrolysis mechanism. The characterization results show that the activation of aluminum mainly comes from three factors: (1) The formation of alumina during ball milling plays an important role in preventing the agglomeration between Al–Bi, Al–Al and Bi–Bi; (2) Bismuth generated during ball milling can form micro-galvanic cell with aluminum to promote the corrosion of aluminum; (3) Sodium chloride as a grinding aid contributes to crush aluminum powder , and chloride ions facilitate the corrosion of aluminum in the hydrolysis process . In addition, the drying method and initial water temperature have a great influence on by-products. The composite is expected to be used in mobile emergency fuel cell due to its rapid hydrogen production capacity.
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JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS
·
2024
·Vol. 35
·期 10
·1-12
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IF 2.8
Ni Hanwen,Zhang Faqiang,He Zichen,Liu Zhifu
The CaTiSiO 5 -based ceramics show promise as dielectric materials for high-temperature MLCC due to their excellent temperature stability which is expected to be improved by co-doping at the A/B sites. In this study, the Dy and Al co-doped CaTiSiO 5 ceramics (Ca 1− x Dy x Ti 1− x Al x SiO 5 , x = 0, 0.005, 0.01, 0.02, 0.03, 0.04, 0.05, 0.06, 0.07, 0.08) were fabricated by the conventional solid-state method. The effects of Dy and Al co-doping on the phase structures, dielectric properties and impedance characteristics, were investigated in detail. CaTiSiO 5 -based ceramics transformed to the paraelectric phase and achieved excellent temperature stability of permittivity by Dy and Al doping, which results from the long-range disorder in the arrangement of Ti displacements within the octahedral chain. Components with x = 0.01 showed linear dielectric response under the electric field. It obtained a high and stable dielectric constant in a wide temperature range ( ε r = 52, TCC ≤ ± 180 ppm/°C over the temperature range from − 55 to 300 °C), low loss (tan δ < 0.07), high breakdown strength (∼ 516 kV/cm) and high DC resistance ( ρ = 3.8 × 10 10 Ω cm at 300 °C).
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ChemSusChem
·
2022
·Vol. 15
·期 7
·e202200099
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IF 9.14
Xinyu Lu,Haoquan Guo,Jiajia Chen,Duoying Wang,Adam F. Lee,Xiaoli Gu
Graphical Oil upgrading : This study investigates the efficient deoxygenation of lignin extracted from Chinese fir sawdust via oxidative delignification to sustainable liquid fuels rich in alkyl guaiacols through in-situ catalytic transfer hydrogenation using isopropanol, formic acid, and NiMo/Al-MCM-41 as organic solvent, internal hydrogen donor, and hydrodeoxygenation catalyst, respectively. Efficient deoxygenation of lignin-derived bio-oils is central to their adoption as precursors to sustainable liquid fuels in place of current fossil resources. In-situ catalytic transfer hydrogenation (CTH), using isopropanol and formic acid as solvent and in-situ hydrogen sources, was demonstrated over metal-doped and promoted MCM-41 for the depolymerization of oxygen-rich (35.85 wt%) lignin from Chinese fir sawdust (termed O-lignin). A NiMo/Al-MCM-41 catalyst conferred an optimal lignin-derived oil yield of 61.6 wt% with a comparatively low molecular weight ( M w =542 g mol −1 , M n =290 g mol −1 ) and H/C ratio of 1.39. High selectivity to alkyl guaiacols was attributed to efficient in-situ hydrogen transfer from isopropanol/formic acid donors, and a synergy between surface acid sites in the Al-doped MCM-41 support and reducible Ni/Mo species, which improved the chemical stability and quality of the resulting lignin-derived bio-oils.
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MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING
·
2022
·
IF 6.044
Peibo Li,Jianian Hu,Tao Fang,Youlin Zhu,Yi Sun,Xiao Wang,Xuebin Yang,Qiang Shen,Guoqiang Luo
The objective of this study is to modulate the size of intermetallic compounds to increase the strength of Al–Ag composites. In this study, we prepared Al–Ag composites using plasma-activated sintering (PAS). The effect of the applied current on the nucleation barrier of the Al/Ag alloy phase was investigated. The strengthening mechanism of Ag-reinforced Al matrix composites was explored. We found that two alloy phases, Ag 2 Al and Ag 3 Al, were generated in the Al–Ag composites. The alloy phases distributed at the grain boundaries strengthened the Al–Ag composites by enhancing the dislocation density in the matrix and by impeding dislocation motion . The ultimate tensile strength and yield strength of the Al–7Ag composite increased by 60.1% and 166%, respectively, compared with those of pure Al. Moreover, we calculated the contribution of each strengthening mechanism to the overall yield strength. The applied current lowered the nucleation barrier of the alloy phase and facilitated the nucleation process.
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高影响因子
JOM
·
2025
·
IF 2.3
Chen Jialin,An Ming,Dai Mengnan,Li Shutao,Chen Yeqing,Song Rui,Song Jiaxing,Chen Longming,Zhong Xiting,Tian Quanwei
The properties of oxidants significantly affect the thermal and combustion properties of nanothermites, and alpha and beta-MnO 2 nanorods with similar morphological appearances were prepared using the hydrothermal method. Corresponding nanothermites were prepared employing the electrostatic spraying method and their thermal and combustion properties have been compared through TG-DSC and combustion tests. The aluminothermic reaction process was simulated by molecular dynamics, and the results showed that the β-MnO 2 /Al nanothermite first underwent β-MnO 2 thermal decomposition followed immediately by an aluminothermic reaction, whereas the α-MnO 2 /Al nanothermite underwent a direct aluminothermic reaction. In contrast, the α-MnO 2 /Al nanothermite could release more heat. According to thermal analysis, the activation energy of α-MnO 2 /Al nanothermite was 100.15 kJ mol − 1 higher than β-MnO 2 /Al nanothermite, indicating better stability. Combustion experiments showed that the combustion propagation rate of the α-MnO 2 /Al nanothermite was faster than the β-MnO 2 /Al nanothermite. The results have been verified and the reaction process has been exhibited using molecular dynamics to simulate the aluminothermic reaction process. The notable differences in the thermal and combustion properties of nanothermites containing MnO 2 with varying phases can be attributed to the distinct crystal structures of α-MnO 2 and β-MnO 2 . The alternating 1 × 1 and 2 × 2 tunnel structure of α-MnO 2 is more stable, whereas β-MnO 2 undergoes thermal decomposition before the aluminothermic reaction.
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高影响因子
Chinese Physics B
·
2025
·
IF 1.5
Wenxia Zhang,Weixia Shen,Chao Fang,Ye Wang,Yuewen Zhang,Liangchao Chen,Qianqian Wang,Kenan Li,Biao Wan,Zhuangfei Zhang
Improving the thermal conductivity of diamond-metal composites has always been a significant challenge in the field of thermal management. In this paper, diamond/Al composites were systematically studied, and the influence of holding time (10-120 min) on interface structure and thermal conductivity was discussed. The research results shows that the long-term thermal diffusion sintering can effectively the dense interfacial bonding of diamond/Al composites and enhance the thermal conductivity. The diamond/Al composites with 50 vol% 900 μm diamond attained the highest value of 888.73 W/mK under the sintering conditions of 650 ℃, 50 MPa, and 120 min, nearly 92% of the theoretical value predicted by the Maxwell model. This study establishes that high thermal conductivity can be achieved through long-term thermal diffusion alone, without the complex diamond surface coating and substrate alloying.
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高影响因子
Defence Technology
·
2025
·
IF 5.9
Ting Liu,Jian Wang,Jie Chen,Cui Nie,Yaofeng Mao,Jun Wang,Ruolei Zhong,Wei Cao,Fude Nie
Aluminum (Al) powder is widely applied in thermobaric explosives due to its high energy density and favorable reaction kinetics. However, the inert oxide layer (Al 2 O 3 ) on Al particles limits combustion reactivity and energy efficiency. Fluoride-based surface modification has been developed as an effective approach to address this issue. Here, four classical fluoropolymers (F11, F14, PVDF, PTFE) are employed as coatings to prepare core-shell Al/Fluoropolymer. The combustion experimental results demonstrate that the core-shell Al/PTFE exhibits the highest flame propagation rate (52.88 mm·ms -1 ) and pressure output (109.02 kPa) performance. Consequently, core-shell Al/PTFE is selected as a high-energy fuel to prepare RDX/Al/PTFE microspheres via the emulsion and solvent evaporation method, which can enhance the energy performance of RDX. The effects of the core-shell Al/PTFE ratio and RDX content on the combustion heat and pressure output are systematically investigated. The peak pressure reaches a maximum of 187.8 kPa when the mass ratio of RDX, Al, and PTFE is 60: 25: 10. Additionally, RDX/Al/PTFE microspheres exhibit significantly higher laser-induced air shock velocities, detonation heat, and detonation pressure than those of pure RDX and RDX/Al. The mechanism underlying the enhanced reactivity and energetic performance is attributed to the ability of PTFE to etch the inert Al 2 O 3 shell on the surface of Al particles, thereby improving post-combustion reactions and significantly increasing the overall energy output of RDX explosives. This work offers a novel design strategy for high-energy structural thermobaric explosives for the practical applications.
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高影响因子
ELECTROCHIMICA ACTA
·
2025
·
IF 5.6
Meina Tan,Yang Qin,Jiaxin Luo,Yiping Wang,Fazhi Zhang,Xuhui Zhao,Xiaodong Lei
Aqueous hybrid-ion batteries (AHBs) offered various advantages, including low cost, high energy density, high operation voltage, safety, and durability. These characteristics made them an attractive choice for energy storage devices. CuS was a high-capacity cathode material for Al storage. However, the rate performance of CuS under high-voltages conditions was not satisfying. Here, we prepared Co-doped CuS (Co-CuS) nanosheet material with the small band gap by using the ball milling method as the cathode material of aqueous Cu-Al hybrid-ion battery. Co doping can improve the electron transport capacity and provide more active sites. At high current density, Co doping enhances the electrochemical kinetics, operating voltage and electrochemical performance of the materials. The battery exhibits a capacity of 175 mAh g -1 at 2000 mA g -1 and 108 mAh g -1 at 4000 mA g -1 . After 200 cycles of charge and discharge tests, a capacity of 93 mAh g -1 remains. This offers a valuable approach to the development of aqueous Cu-Al hybrid-ion battery electrode materials with good electrochemical performance under high operating voltage and high current conditions.
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高影响因子
CERAMICS INTERNATIONAL
·
2025
·
IF 5.6
Jingxian He,Zhen Jiang,Yuan Liu,Zhenfeng Jing,Shuhui Sun,Haixia Zhang,Fengqing Zhang
This study successfully synthesized bismuth ferrite (BFO) thin films co-doped with europium (Eu) and aluminum (Al) using the sol-gel method, while comprehensively investigating their performance characteristics. By systematically adjusting the Al doping ratio in Bi 0.98 Eu 0.02 Fe1 -x Al x O 3 (with x = 0, 0.01, 0.03, 0.05, 0.07), significant changes in the material properties were observed. XRD and Raman spectroscopy validated the presence of R 3 c and Pnma phases in the synthesized BFO thin films, which demonstrated excellent crystallinity. Microstructural and compositional assessments, performed using SEM and XPS, indicated that the BEFAO5 sample possessed high crystallinity and a relatively low oxygen vacancy content. These characteristics enhanced the exceptional current-voltage (J-V) properties and ferroelectric behavior of BEFAO5. Additionally, the influence of vacancy defects on the ferroelectric efficiency and durability of BFO ferrite thin films was examined. The results indicated that the co-doping approach significantly improved the material's resistance to aging. In summary, the combined doping of Eu and Al not only substantially modified the crystalline structure and physical attributes of BFO thin films but also markedly enhanced their potential for applications in energy storage and spintronic technologies.
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高影响因子
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