INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2025
·
IF 3.9
Kai Fan,Shuo Liu,Ye Ma,Qinming Wu,Sen Wang,Andree Pauschinger,Andrei-Nicolae Parvulescu,Nils Bottke,Toshiyuki Yokoi,Dirk E. De Vos,Xiangju Meng,Weiping Zhang,Feng-Shou Xiao
ITR zeolites exhibited excellent performance in methanol to propylene (MTP), where an important factor was the Al distribution of the ITR zeolites. However, optimization of the Al location in ITR zeolites in the conventional synthesis is challenging. In this work, the Al distribution in the ITR zeolites was efficiently adjusted by adding boron species in the synthesis gels due to the competitive occupancy of T sites in zeolites between boron and aluminum species. The obtained ITR with different boron content zeolites displayed similar nanosheet morphology, textural parameters, and strong acidic concentration but characterizations of Al distribution showed that the addition of boron species led to more Al species distributed in a relatively small sinusoidal channel and less Al species located in an intersection cavity. As a result, the aromatic cycle would be effectively suppressed due to the steric configuration of large aromatic cycle intermediates, whereas the alkene cycle will be enhanced correspondingly. As expected, catalytic tests in the conversion of MTP showed that the new ITR zeolites exhibited enhanced propylene selectivity and catalyst lifetime with the incorporation of boron species, which was attributed to different Al distribution in these ITR zeolites.
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DOI
高影响因子
MOLECULES
·
2025
·Vol. 30
·期 23
·4628
·
IF 4.6
Yaru Qin,Tingfei Yang,Na Chen,Jiale Li,Anqi Li,Yu Miao,Chenglong Shi,Jianmin Ma,Xue Qin
Layered transition-metal oxides are among the most promising sodium-ion battery cathodes owing to their high specific capacities and structurally tunable frameworks. However, the prototypical P2-Na0.67Ni0.33Mn0.67O2(NM) undergoes an irreversible P2 → O2 phase transition at high voltages, accompanied by severe lattice strain and capacity fade, which hinders practical deployment. Here, we propose a cooperative regulation strategy that couples Zn/Al co-doping with Na enrichment, and successfully synthesize P2-Na0.80Ni0.14Zn0.14Mn0.58Al0.14O2(NMZA-N14). The optimized NMZA-N14 delivers an initial discharge capacity of 125 mAh g−1at 0.1C and demonstrates exceptional cycling and rate performance, retaining 98.6% of its capacity after 100 cycles at 0.2C and 93.6% after 200 cycles at 1C. Kinetic analyses indicate a higher Na+diffusion coefficient and a lower charge-transfer resistance in NMZA-N14, evidencing substantially accelerated ion transport. In situ X-ray diffraction further reveals a reversible P2 → OP4 phase transition in the high-voltage regime with a unit-cell volume change of only ~2.27%, thereby avoiding the irreversible structural degradation observed in NM. This synergistic modulation markedly enhances structural stability and electrochemical kinetics, providing a viable pathway for the rational design of high-performance sodium-ion battery cathodes.
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DOI
PubMed
高影响因子
COMBUSTION AND FLAME
·
2025
·
IF 6.2
Yanggang Huang,Yong Kou,Ting Chang,Jiaqi Wei,Hongfei Liu,Lei Xiao,Wei Jiang,Gazi Hao
Aiming at the critical issues of uneven dispersion, inadequate interfacial contact, and significant mass/heat transfer resistance inherent in the mechanical mixing process for traditional solid propellant charging, this study proposes a novel strategy for constructing energetic micro-units through core-shell structural design, with the aim of achieving highly reactive and integrated composites tailored for practical solid propellant applications. Using etched aluminum (Al) powder as the core and ammonium perchlorate (AP) together with hexanitrohexaazaisowurtzitane (CL-20) as the composite shell, Al@AP/CL-20 micro-units with uniform coatings of AP/CL-20 and well-defined core-shell structures were successfully fabricated via solvent evaporation. The thermogravimetric-differential scanning calorimetry (TG-DSC) and combustion analyses indicate that Al@AP/CL-20 energetic micro-units exhibit significantly earlier decomposition peak temperature compared to pure AP, larger and more concentrated exothermic peaks, as well as stronger combustion intensity and higher flame temperature than the Al/AP/CL-20 composite in the physical mixture. The result confirms that the Al@AP/CL-20 composite structure can effectively enhance the synergistic effect between components, thereby improving the performance of the micro-units. Moreover, as the etching time increases, the porosity of the Al powder surface rises, leading to a further enhancement in the combustion performance of the Al@AP/CL-20 energetic micro-unit. In particular, when the Al powder etching time reached 5 h and the mass ratio of Al/AP/CL-20 was 1:2:2, the Al@AP/CL-20 micro-units demonstrated the best combustion performance, with the highest light intensity and a maximum flame temperature of 1094 °C — a 49 % improvement over the physically blended sample (PAAC-2) with the same mass ratio. This is attributed to the well-defined core-shell structure, which significantly shortens mass and heat transfer distances between components, and a better-matched oxygen balance that imparts the best combustion efficiency. The study affirms that the core-shell energetic micro-unit strategy effectively overcomes the limitations of conventional mixing methods and provides a pathway for formulating highly reactive solid propellant with enhanced energy release efficiency.
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DOI
高影响因子
COMBUSTION AND FLAME
·
2020
·
IF 4.57
Lirong Bao,Wei Zhang,Xiaojun Zhang,Yongyi Chen,Suhang Chen,Lizhi Wu,Ruiqi Shen,Yinghua Ye
In the controllable combustion field, hydroxyl ammonium nitrate (HAN)-based electrically controlled solid propellants (ECSPs) is of growing interest in green fuels with safety, throttle- ability and at-will on-off capability. However, the current research is confined to the ignition characteristics and ablation process of basic ECSP formulations (75 wt% HAN ionic liquid oxidizer , 5 wt% ammonium nitrate co-oxidizer and 20 wt% polyvinyl alcohol binder), rather than working in functional additives. Herein, multiwall carbon nanotubes (MWCNT) and nano/micro aluminum powders were introduced in ECSPs, facilitating electrical conductivity and energy release. It indicates that the homogeneous dispersed MWCNT in polyvinyl alcohol (PVA) microspheres , preparing by the micro-segmented flow method, results in a 9.8% increase in electrical conductivity of the ECSPs. At 0.5 MPa, ECSPs containing 1%, 3% and 5% 5 µm aluminum powder reinforce the burning rate by 38.0%, 186.3%, 214.7% and mass ablation by 10.7%, 95.2%, 175.6% at 200 V, yet the large heat release by excess aluminum powder shifts the non-self-sustaining combustion of ECSPs to self-sustaining combustion at high pressure (above 0.8 MPa). The mechanism of promoting ECSPs combustion by liberating aluminum-nitric acid (released by HAN ionization) reaction were proposed.
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DOI
高影响因子
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
·
2021
·
IF 5.816
Yanyan Wu,Zijuan Xie,Ying Li,Zhe Lv,Lingling Xu,Bo Wei
Developing efficient oxygen evolution reaction (OER) electrocatalysts with earth-abundant elements is very important for sustainable H 2 generation via electrochemical water splitting. Here we design a crystalline-amorphous Ni–Fe–Al hybrid phosphides nanosheet arrays grown on NiFe foam for efficient OER application. Dynamic surface reorganization of phosphides at anodic/cathodic polarizations is probed by in situ Raman spectroscopy . The reconstructed amorphous Ni(Fe)OOH species are determined as the active phases that facilitate the OER process. This unique electrode shows highly catalytic activity toward water oxidation , achieving the current densities of 10 and 100 mA cm −2 at 181 and 214 mV in 1 M KOH, respectively. Meanwhile, it also exhibits excellent stability at a large current density of 100 mA cm −2 for over 60 h. This work reveals the dynamic structural transformation of pre-catalyst in realistic conditions and highlights the important role of oxyhydroxides as real reactive species in OER process with high activity.
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DOI
高影响因子
Surfaces and Interfaces
·
2022
·
IF 6.137
Peiyuan Ji,Xiang Zhang,Jing Wan,Chengshuang Zhang,Qianxi Yang,Xuemei Zhang,Li-Yong Gan,Yi Xi
Challenges, such as limited active sites and undesirable cyclic stability, still hinder the practical applications of Ni-Co phosphides (NCP) based electrode materials. To solve those issues, Al-induced NCP nanosheets (NCAP) decorated on nickel foam were successfully fabricated and applied as a high-performance binder-free electrode material for alkaline supercapacitors . The transformation of NCAP during the reaction with alkaline electrolyte was also investigated. NCAP has a series of irreversible changes with the enhancement of the capacitive performance during the initial reaction with KOH to the final form of the Al-induced Ni-Co phosphides@layered double hydroxides (NCAP@LDHs) with the stable composite nanostructure . Moreover, the Density Functional Theory analysis results show that Al not only adjusts the density of states and ions migration barrier of the newly formed LDHs but also enhances the synergetic behavior between the LDHs and NCAP overall conductivity of the composites. So, a higher capacity of 1138.7 C/g was achieved in the NCAP@LDHs system compared with 643.5 C/g of NCP. The as-assembled hybrid supercapacitor (HSC) with satisfactory specific energy and specific power could light 160 LEDs and a hygrometer successfully, which suggests the potential to be applied in the energy storage field.
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高影响因子
BMC Chemistry
·
2024
·Vol. 18
·期 1
·1-13
·
IF 4.3
Chen Jialin,Li Shutao,Dai Mengnan,An Ming,Song Rui,Chen Yeqing,Song Jiaxing,Tian Quanwei,Zhong Xiting,Yan Qiushi
To improve the thermal and combustion properties of nanothermites, a design theory of changing the state of matter and structural state of the reactants during reaction was proposed. The Al/MoO 3 /KClO 4 (Kp) nanothermite was prepared and the Al/MoO 3 nanothermite was used as a control. SEM and XRD were used to characterize the nanothermites; DSC was used to test thermal properties; and constant volume and open combustion tests were performed to examine their combustion performance. Phase and morphology characterization of the combustion products were performed to reveal the mechanism of the aluminothermic reaction. The results show that the Al/MoO 3 /Kp nanothermite exhibited excellent thermal properties, with a total heat release of 1976 J·g − 1 , increasing by approximately 33% of 1486 J·g − 1 of the Al/MoO 3 nanothermite, and activation energy of 269.66 kJ·mol − 1 , which demonstrated higher stability than the Al/MoO 3 nanothermite (205.64 kJ·mol − 1 ). During the combustion test, the peak pressure of the Al/MoO 3 /Kp nanothermite was 0.751 MPa, and the average pressure rise rate was 25.03 MPa·s − 1 , much higher than 0.188 MPa and 6.27 MPa·s − 1 of the Al/MoO 3 nanothermite. The combustion products of Al/MoO 3 nanothermite were Al 2 O 3 , MoO, and Mo, indicating insufficient combustion and incomplete reaction, whereas, the combustion products of Al/MoO 3 /Kp nanothermite were Al 2 O 3 , MoO, and KCl, indicating complete reaction. Their “coral-like” morphology was the effect of reactants solidifying after melting during the combustion process. The characterization of reactants and pressure test during combustion reveals the three stages of aluminothermic reaction in thermites. The excellent thermal and combustion performance of Al/MoO 3 /Kp nanothermite is attributed to the melt and decomposition of Kp into O 2 in the third stage. This study provides new ideas and guidance for the design of high-performance nanothermites.
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DOI
高影响因子
CERAMICS INTERNATIONAL
·
2022
·
IF 5.532
Zhiyu Ma,Weijia Guo,Zhenxing Yue
TiO 2 -added Ba 4 (Sm 0.65 Nd 0.35 ) 9.33 Ti 17.75 Al 0.33 O 54 (BSNTA) ceramics were fabricated with a solid-state reaction method. Slight TiO 2 addition increased the dielectric constant ( ε r ) of BSNTA ceramics and brought about a near-zero temperature coefficient of resonant frequency ( τ f ). Sintering in oxygen increased the density of TiO 2 -added BSNTA ceramics and surprisingly concurrently improved the ε r and Q × f value. Thermally stimulated depolarization current (TSDC) measurements indicated that TiO 2 addition introduced oxygen vacancies ( V O .. ) and Ti Ti ' − V O .. defect dipoles and that an oxygen-sufficient sintering atmosphere decreased the concentration of these defects and thus increased Q × f values. From the viewpoint of defect behaviors, this observation offered original insight into the mechanism by which the sintering atmosphere had impacts on the Q × f value of titanate ceramics. Satisfying dielectric properties ( ε r = 79.5, Q × f = 14,840 GHz, τ f = 0 ppm/°C) were attained in oxygen-sintered BSNTA-0.6%TiO 2 ceramics that might be suitable for the manufacture of miniature microwave devices such as filters and antennas.
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DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2022
·
IF 6.371
Yanhua Zhang,Xinglong Gao,Zijun Tang,Yuhang Mei,Xing Xiang,Jiadong Deng
The lithium dendrites growth in Li 7 La 3 Zr 2 O 12 (LLZO) solid electrolytes has severely restricted the development of all-solid-state lithium batteries. Herein, two different dynamic properties interlayers of electronically conductive Al and an electronically non-conductive Al 2 O 3 are constructed at the Li/LLZO interface, and the lithium dendrite growth mechanism is explored. Results show that battery with Al interlayer occur internal short circuit in 95 cycles, while the battery with annealed Al 2 O 3 interlayer has good cycle stability of 1000 cycles with polarization voltage below 0.1 V. Besides, dendritic lithium dendrites can be clearly observed at the LLZO grain boundaries of battery with Al interlayer. Raman and XPS results show that the Al 2 O 3 interlayer reacts with Li + during the charge and discharge process to form a Li-Al-O compound which is Li + conductive. It is concluded that the lithium dendrite inhibition mechanism of the Li-Al-O compound interlayer is that it can promote the Li + conduction from LLZO to lithium anode to undergo a lithium deposition reaction, and prevents electrons from conducting to LLZO and combine with Li + to occur lithium dendrite growth. While for the Al interlayer, electrons can reach LLZO through the interlayer to combine with Li + thus occurring the lithium dendritic growth.
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高影响因子
CHEMOSPHERE
·
2018
·
IF 4.427
Wenyu Wang,Qinyan Yue,Ruihua Li,Fan Bu,Xue Shen,Baoyu Gao
This study investigated membrane fouling in a coagulation/ultrafiltration (C-UF) process by comparing the floc properties and humic acid (HA) removal efficiency of three hydrous Al(III) species (Al a , Al b , and Al c ). The results indicated that the coagulation and membrane mechanisms were different for all three Al species because of the differences in floc properties. The HA removal efficiency increased with increasing Al dosage until an equilibrium was reached at the optimal dosage of 6 mg L −1 . In addition, membrane fouling gradually decreased as the Al dosages increased. Regardless of coagulant type, the OH and COOH functional groups of HA reacted with the Al species. Both external and internal membrane fouling were strongly dependent on the porosity of the cake layer and on the size distribution of the floc particulates, respectively. The pore area of the cake layer formed by the Al a -coagulated effluent was large because of the strong charge neutralization. Moreover, Al a generated large and loose flocs with a porous cake layer that mitigated external fouling. However, the internal fouling with the Al c coagulant was significant because the concentration of residual aggregates in the membrane pores was high.
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高影响因子
ACS Applied Energy Materials
·
2022
·
IF 6.959
Yanxue Guan,Juan Qin,Xinyue Guo,Zongjia Li,Haoran Guo,Miaomiao Zhang,Bailin Zhang,Jilin Tang
Nickel-aluminum layered double hydroxides (Ni-Al LDHs) are widely used in energy storage and conversion devices, and the impact of the Ni/Al molar ratio on the structural evolution and kinetic process is of great significance for improving reaction kinetics and efficiency. In this paper, the morphological evolutions and nanomechanical property changes of Ni-Al-n LDH (n is the Ni/Al molar ratio) nanosheets during potential cycling were explored by in situ electrochemical atomic force microscopy. The conversion of Ni2+ into Ni3+ and the amphoteric properties of Al3+ during potential cycling resulted in the dissolution of Ni-Al-n LDH nanosheets. The dissolution rate of Ni-Al-2 LDH nanosheets was slower than those of Ni-Al-2.5 LDH and Ni-Al-3 LDH nanosheets. Meanwhile, the Young’s modulus value of the dissolved area was much larger than that of the undissolved area, and the dissolved area exhibited a harder property. It was attributed to the different microcrystalline structures of Ni-Al LDH nanosheets affected by the Ni/Al molar ratio and the rearrangement of Ni2+ and Al3+ during the reaction. The slow dissolution of Ni-Al-2 LDH nanosheets was beneficial to improving the electrochemical performance, while the fast dissolution of Ni-Al-2.5 LDH and Ni-Al-3 LDH nanosheets was not conducive to the electrochemical performance. Understanding the effect of the Ni/Al molar ratio on the morphological evolutions and nanomechanical property changes of Ni-Al LDH nanosheets during potential cycling has important guiding significance for the subtle compositional modification and structural design of Ni-Al LDHs as an electrode material.
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高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2021
·
IF 3.764
Hongyu Niu,Yuan Cheng,Chuang Li,Shaojie Li,Jingjie Luo,Changhai Liang
Rational design of promising Cu catalyst requires better understanding of the Cu–support perimeter for reactions such as hydrogenation rearrangement of furfural─a pivotal and alternative transformation to produce cyclopentanol. Herein, a series of Cu catalysts with constructed Cu-M-Ox interfaces (M = Zn or Al) have been synthesized. In freshly reduced Cu/ZnO-Alx samples, aluminum species was enriched surrounding Cu. The Cu-Al-Ox contacting interface was formed, and the CuAl2O4 spinal structure was detected as a combining consequence only if Zn and Al species coexisted. The specific metal–support synergistic interaction and Cu-Al-Ox contacting interface simultaneously aroused the enhanced redox property and large number of surface acid sites, facilitating the adsorption/activation of hydrogen and reactants. During the reaction, Al2O3 retreating from the Cu-Al-Ox interface caused the replacement of Cu-Al-Ox by new Cu-Zn-Ox interface, which was directly correlated with the irreversibly changed chemical structure and decreased cyclopentanol yield, although the furfural conversion was well sustained. In this work, we confirmed that supported copper catalysts were competent for the activation and conversion of furfural, with the turnover frequency reaching 28.1 h–1 by the Cu/ZnO-Al3 sample at temperatures as low as 90 °C. The further transformation of cyclopentanone to cyclopentanol was largely depending on the maintenance of a steady Cu-Al-Ox contacting interface.
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高影响因子
危险品化学品经营许可证（带存储）