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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Materials Today Chemistry
·
2022
·
IF 7.613
J. Ding,X. Cui,Q. Ren,Y. Mao,J. Zhang,G. Zhou,X.-M. Zhang
Organic-inorganic metal halides have garnered extensive attention due to their versatile structures as well as fascinating optical properties , among which especially antimony halides are the focus of recent research. Herein, we design a series of novel zero-dimensional (0D) antimony halides of (C 13 H 14 N 3 ) 3 SbCl 6– x Br x ( x = 0, 3, 6) with bright and tunable broadband emissions from yellow (576 nm) to orange (600 nm), which are attributed to the triplet self-trapped excitons (STEs) of the six-coordinated [SbX 6 ] 3– (X = Cl − or Br − ) units. The role of halogens on their specific 3 P 1 → 1 S 0 transition is determined, wherein Cl/Br transmutation reveals a common law modulating photoluminescence behaviors. Furthermore, a new two-step compound technology is innovatively developed for performance optimization, enabling by incorporating the pristine antimony halides into polymethyl methacrylate (PMMA) with high transparency and strong moisture resistance . The composites (C 13 H 14 N 3 ) 3 SbCl 6– x Br x /PMMA ( x = 0, 3, 6) were fabricated through a demanding technology that significantly improve the processability and water stability of antimony halides while maintaining high photoluminescence quantum yields . This work not only proposes a method for halogen substitutions to tune emission, but also opens up a feasible research avenue for performance optimization in the multifunctional luminescence materials.
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高影响因子
CHEMICAL RESEARCH IN CHINESE UNIVERSITIES
·
2023
·Vol. 39
·期 4
·654-659
·
IF 3.1
Zhu Xia,An Jiakun,Chen Gaoyu,Xing Chenyu,Bao Jianchun,Xu Xiangxing
Perovskite single crystals are prominent semiconductor materials due to their high carrier mobility, long carrier diffusion length, and large absorption coefficient. They can be used as optoelectronic functional materials for narrowband or broadband photodetectors. In this report, the photodetection band tunability was achieved by doping MAPbX 3 (MA=methylammonium, X=Cl/Br/I) perovskite single crystals with sub-nano carbon dots (MAPbX 3 -C). The sub-nano size and good dispersibility of the carbon dots ensured controllable doping. The absorption of the sub-nano carbon dots and trap states in the MAPbX 3 -C single crystals resulted in the special responsivity spectrum features.
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高影响因子
JOURNAL OF MATERIALS SCIENCE
·
2021
·Vol. 56
·期 12
·7494-7507
·
IF 4.22
Zhang Rui,Yuan Yaoxin,Zhang Jianfeng,Liu Haiyun,Chen Gang,Li Kun,Hong MengQing,Zuo Wenbin,Wang Chunlan,Yang Wen,Qin Zhenxing
Mn-doped perovskite CsPb(Cl/Br) 3 nanocrystals (NCs) have been widely explored due to their unique dual-color emission characteristics, which could reduce the usage of toxic Pb and introduce the exciton emission in blue region and the stable Mn 2+ emission peak in orange-red region via energy transfer from exciton to Mn 2+ emission. Although doping high concentration Mn 2+ could increase the Mn 2+ emission, excess Mn 2+ ions would be expelled from the host perovskite lattice. Doping secondary metal Ni into the NCs as an efficient method is always used to improve the Mn 2+ emission. We adopted a one-pot halogen injection into Cs-precursor under ambient environment method to prepare (Mn, Ni): CsPbCl 3 and (Mn, Ni): CsPb(Cl/Br) 3 NCs, which introduces NiCl 2 in the Mn: CsPb(Cl/Br) 3 NCs to supply enough halide ions and to passivate defect states or traps in the perovskite NCs so as to enhance Mn 2+ emission. Density Functional Theory (DFT) calculations were also conducted to explain our experimental results, which revealed that Ni 2+ doping could eliminate the in-gap deep defects of the CsPb(Cl/Br) 3 nanocrystals. In addition, the passivated lattice defects help to improve the stability of the perovskite NCs, preventing from electron beam irradiation.
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Journal of Materials Chemistry A
·
2020
·Vol. 8
·期 27
·13610-13618
·
IF 11.301
Qian Zhang,Xuqiang Liu,Nana Li,Bihan Wang,Quan Huang,Lin Wang,Dongzhou Zhang,Yonggang Wang,Wenge Yang
Sillen compounds with the general formula of PbBiO2X (X = Cl, Br, I) are frequently studied as photocatalysts, and have attracted widespread attention due to their degradation of organic contaminants and water oxidation under visible light irradiation. Among many photoelectric materials, the band gap has been reduced approaching to the optimum value by pressure (1.34 eV for photovoltaic materials according to the Shockley–Queisser limit), which is favorable to their photo-responsive applications. However, such enhanced properties are usually restored after the pressure is released. Here, by combining the pressure and chemical engineering tools, we discovered that the optimized structure and optical band gap of PbBiO2Br could be locked after compression–decompression treatment cycling by selecting appropriate elemental species. The pressure-induced strain retention in PbBiO2Br could be the cause of the structural and optical irreversible behavior. Moreover, the compression behavior and optical band gap under high pressure in the PbBiO2X system were studied systematically by in situ high pressure synchrotron X-ray diffraction, UV-vis absorption spectroscopy and resistivity experiments. Along with the enhanced photocurrent under compression, the PbBiO2X compounds under external pressure exhibited great potential for photocatalytic applications under solar light irradiation. In a suitable element category, the pressure-driven structural lock-in preserves its optical performance, opening up a new window for manipulating and filtrating better multifunctional materials.
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高影响因子
Nanoscale Research Letters
·
2016
·Vol. 11
·期 1
·1-9
·
IF 2.584
Wang Wen,Zhang Zongbao,Cai Yangyang,Chen Jinshan,Wang Jianming,Huang Riyan,Lu Xubing,Gao Xingsen,Shui Lingling,Wu Sujuan,Liu Jun-Ming
In this work, perovskite solar cells (PSCs) with CH 3 NH 3 PbI 3- x
Cl
x
as active layer and spiro-OMeTAD as hole-transport media have been fabricated by one-step method. The methylammonium iodide (CH 3 NH 3 I) solution with different concentrations is used to modify the interface between mesoporous TiO 2 (meso-TiO 2 ) film and CH 3 NH 3 PbI 3− x
Cl
x
perovskite layer. Several techniques including X-ray diffraction, scanning electron microscopy, optical absorption, electrochemical impedance spectroscopy (EIS) and photoluminescence are used to investigate the effect of the interfacial modification. It is found that the interfacial modification by CH 3 NH 3 I enhance the crystallinity and increase the grain size of CH 3 NH 3 PbI 3− x
Cl
x
layer, and improve the surface wetting properties of perovskite precursor on meso-TiO 2 film. The sunlight absorption and external quantum efficiency of PSCs in the visible region with wavelength less than 600 nm have been improved. The Nyquist plots obtained from the EIS suggest that the CH 3 NH 3 I modification can reduce the charge recombination rates. The photoluminescence measurement shows that the exciton dissociation in the modified devices is more effective than that in the control samples. The photovoltaic performance of the modified devices can be significantly improved with respect to the reference (control) devices. The CH 3 NH 3 I modified devices at the optimized concentration demonstrate the average power conversion efficiency of 12.27 % in comparison with the average efficiency of 9.68 % for the reference devices.
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高影响因子
ACS Nano
·
2015
·
IF 12.881
Feng Zhang,Haizheng Zhong,Cheng Chen,Xian-gang Wu,Xiangmin Hu,Hailong Huang,Junbo Han,Bingsuo Zou,Yuping Dong
Organometal halide perovskites are inexpensive materials with desirable characteristics of color-tunable and narrow-band emissions for lighting and display technology, but they suffer from low photoluminescence quantum yields at low excitation fluencies. Here we developed a ligand-assisted reprecipitation strategy to fabricate brightly luminescent and color-tunable colloidal CH3NH3PbX3 (X = Br, I, Cl) quantum dots with absolute quantum yield up to 70% at room temperature and low excitation fluencies. To illustrate the photoluminescence enhancements in these quantum dots, we conducted comprehensive composition and surface characterizations and determined the time- and temperature-dependent photoluminescence spectra. Comparisons between small-sized CH3NH3PbBr3 quantum dots (average diameter 3.3 nm) and corresponding micrometer-sized bulk particles (2–8 μm) suggest that the intense increased photoluminescence quantum yield originates from the increase of exciton binding energy due to size reduction as well as proper chemical passivations of the Br-rich surface. We further demonstrated wide-color gamut white-light-emitting diodes using green emissive CH3NH3PbBr3 quantum dots and red emissive K2SiF6:Mn4+ as color converters, providing enhanced color quality for display technology. Moreover, colloidal CH3NH3PbX3 quantum dots are expected to exhibit interesting nanoscale excitonic properties and also have other potential applications in lasers, electroluminescence devices, and optical sensors.
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高影响因子
JOURNAL OF ANALYTICAL AND APPLIED PYROLYSIS
·
2025
·
IF 6.2
Chenhao Li,Yi Niu,Linlin Yi,Yaoqiang Li,Jia Fu,Fang Tang,Kaiyuan Li,Yanyan Zou
This paper explores the application of zeolitic imidazolate framework-8 (ZIF-8) in pyrolytic disposal of poly(vinyl chloride) (PVC), with the goal of assessing the in situ catalytic removal and capture effect of ZIF-8 on Cl, elucidating the migration pattern of Cl, revealing the mechanism of in situ Cl capture by ZIF-8. The results demonstrate that excellent catalytic and Cl trapping properties are exhibited by ZIF-8, and an additional 311.1 mg/g of organic Cl from PVC is facilitated to be removed at 250 ºC. The catalytic effect enhances Cl trapping at low temperatures. The solid-solid reaction between PVC and ZIF-8 during in situ pyrolysis significantly improves Cl capture compared to ex situ pyrolysis. During in situ pyrolysis, ZIF-8 shows excellent Cl capture between 250 and 350 ºC, where Cl is primarily captured in the solid phase as inorganic Cl. ZIF-8 achieves optimal Cl capture at 300 ºC, reaching a peak HCl removal rate of 89.5 %. At this temperature, the content of solid-phase inorganic Cl reaches a maximum of 442.0 mg/g, accounting for 78.7 wt% of the total Cl content. The key to Cl capture lies in the chemical adsorption sites of Zn²⁺ and organic ligands in the ZIF-8 structure, which can react with Cl in both solid-solid and gas-solid reactions. Additionally, crystals formed during pyrolysis create an adsorption barrier, ultimately enabling efficient Cl capture.
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高影响因子
Materials Science and Engineering B-Advanced Functional Solid-State Materials
·
2021
·
IF 4.051
Zhihao Chen,Haiyang He,Zhuoqi Wen,Zhongjie Cui,Shiliang Mei,Dan Yang,Xian Wei,Wanlu Zhang,Fengxian Xie,Bobo Yang,Ruiqian Guo
Broadband emission Mn 2+ doped lead halide perovskites are deemed as promising phosphor materials for solid state white light-emitting-diodes (WLEDs). Herein, we report a facile gram-scale synthesis of Mn-doped CsPb(Br/Cl) 3 phosphors by doping MnCl 2 into CsPbBr 3 perovskite nanocrystals at room temperature. The obtained phosphors present dual-color emission with blue emission at 463 nm and red emission at 602 nm. Increasing MnCl 2 doping amount can enhance the red emission while more 3-Aminopropyltrimethoxysilane (APTMS) ligands can repress Mn related impurity and provide high stability. Further, two kinds of WLEDs (monocomponnet and two-component) are demonstrated. The monocomponent WLED exhibits warm white light under various driving currents (30 mA–150 mA), and the two-component WLED shows good chromatic performance close to ideal white light (0.33, 0.33), demonstrating their potential applications in WLED devices.
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高影响因子
ACS Applied Materials & Interfaces
·
2022
·
IF 10.383
Weiwei Li,Chunhua Zhang,Ziman Zheng,Xiaoyu Zhang,Lin Zhang,Alexander Kuhn
Electrochemical regeneration of the reduced form of the nicotinamide adenine dinucleotide (NADH) cofactor catalyzed by immobilized [Rh(Cp*)(bpy)Cl]+ is a promising approach for the enzymatic synthesis of many valuable chemicals with NAD-dependent dehydrogenases. However, rational control of the efficiency is often limited by the irregular structure of the electrode/electrolyte interface and the accessibility of the molecular catalyst. Here, we propose an electrochemical system for NADH cofactor regeneration, based on highly ordered three- dimensional (3D) metal–organic framework (NU-1000) films. [Rh(Cp*)(bpy)Cl]+ is incorporated at the zirconium nodes of NU-1000 via solvent-assisted ligand incorporation (SALI), leading to a diffusion-controlled behavior, associated with an electron hopping mechanism. Varying the ratio of redox-active [Rh(Cp*)(bpy)Cl]+ and inactive postgrafting agents enables the elaboration of functional electrodes with tunable electrocatalytic activity for NADH regeneration. The exceptionally high faradic efficiency of 97%, associated with a very high turnover frequency (TOF) of ∼1400 h–1 for NADH regeneration, and the total turnover number (TTN) of over 20000 for the enzymatic conversion from pyruvate to l-lactate, when coupled with l-lactate dehydrogenases (LDH) as a model reaction, open up promising perspectives for employing these electrodes in various alternative bioelectrosynthesis approaches.
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DOI
PubMed
高影响因子
APPLIED CATALYSIS B-ENVIRONMENTAL
·
2022
·
IF 24.319
Xiao Yu,Mengyi Shi,Yixuan Fan,Lixia Yang,Jie Zhang,Wei Liu,Weili Dai,Shuqu Zhang,Lei Zhou,Xubiao Luo,Shenglian Luo
Mn 2 O 3 is an exceptional earth-abundant mineral that has been extensively applied in catalytic oxidation because of the strong redox couples like Mn 3+ /Mn 2+ and Mn 4+ /Mn 3+ exposed on Mn 2 O 3 surface. Herein, the catalytic activity of Mn 2 O 3 in photothermal degradation of toluene was regulated by halogens including F - , Cl -, and Br - . As the electronegativity ordered in F (3.98) > O (3.44) > Cl (3.16) > Br (2.96), F - doped Mn 2 O 3 overperforms Cl - doped and Br - doped Mn 2 O 3 in decomposing toluene. DFT theoretical calculation illustrates that F - attracts the shared electrons from Mn to itself, the deviated charge center stretches the adjacent Mn-O bonds and boosts the generation of abundant oxygen vacancies, helping to strengthen the catalytic activity of Mn 2 O 3 . Conversely, Mn-O bonds are shortened by Cl - and Br - that have lower electronegativity than O. The multiple electrons circling Cl - and Br - push Mn towards O and squeeze Mn-O bonds, resulting in the formation of passivated Mn 2 O 3 . In conjunction with Mn redox couples and oxygen vacancies, 99% of 400 ppm toluene can be eliminated by F - doped Mn 2 O 3 , corresponding mineralization rate is high up to 95.8%.
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高影响因子
ACS Applied Materials & Interfaces
·
2025
·
IF 8.2
Kun Lang,Yuanyingxue Gao,Xudong Xiao,Qi Li,Mingyang Liu,Jianan Liu,Huiquan Gu,Wei Wu,Huiyuan Meng,Baojiang Jiang
Seawater electrolysis offers a sustainable pathway for green hydrogen production, but chloride-induced side reactions, particularly chlorine evolution (ClER), limit the stability and efficiency of catalysts. Based on an interface-engineering strategy, a bifunctional CoP–MXene electrocatalyst was designed and fabricated, in which electrons are transferred from the Ti sites of the MXene support to the adjacent Co active centers of CoP. This directional electron donation modulates the Co electronic structure, generating electron-rich Co sites that effectively suppress Cl– adsorption via electronic repulsion while preserving the OH– reaction pathways through favorable proton–electron coupling. X-ray absorption fine structure (XAFS) spectroscopy, in situ Raman spectroscopy, and density functional theory (DFT) calculations further validate this electron modulation mechanism. In 1 M KOH electrolyte, CoP–MXene achieves a hydrogen evolution reaction (HER) overpotential of only 93 mV at 10 mA cm–2 and an oxygen evolution reaction (OER) current density of 50 mA cm–2 at 346 mV. In alkaline seawater, CoP–MXene exhibits exceptional HER performance (10 mA cm–2 @ 101 mV). Moreover, in an anion exchange membrane (AEM) electrolyzer (at 2 A cm–2 current density), the catalyst maintains over 500 h of stability in seawater with only 8.5% current decay, significantly outperforming the control samples. This study provides a new design strategy for the development of chloride-resistant electrocatalysts, advancing the application of seawater electrolysis technologies.
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高影响因子
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