ACS Applied Materials & Interfaces
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2024
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IF 8.3
Kai-Zheng Song,Jin-Zhao Huang,Meng-Xin Li,Feng-Lei Jiang
High-performance, environmentally friendly indium phosphide (InP)-based quantum dots (QDs) are urgently needed to meet the demands of rapidly evolving display and lighting technologies. By adopting the highly efficient and cost-effective one-pot method and utilizing aluminum isopropoxide (AIP) as the Al source, a series of Al-doped InP/(Al)ZnS QDs with emission maxima ranging from 480 to 627 nm were synthesized. The photoluminescence quantum yield (PLQY) of the blue, green, yellow, orange, and red QDs, with emission peaks at 480, 509, 560, 600, and 627 nm, reached 34%, 62%, 86%, 96%, and 85%, respectively. Remarkably, the required reaction times for synthesizing the above QDs were all within 4 h, showcasing the high efficiency of this one-pot method. Moreover, the influence of Al-doping on red InP/ZnS QDs was thoroughly explored. Compared with undoped QDs, the increased PLQY, narrowed full-width at half-maximum (fwhm), and enhanced photostability were observed in Al-doped QDs. Characterization results revealed the relatively thicker shell in Al-doped QDs and demonstrated the presence of Al in the shell in the form of AlPOx. The increased shell thickness and narrowed fwhm indicated a reduced lattice strain at the core–shell interface in Al-doped QDs, which might result from the introduced trivalent Al3+, as it alleviated the charge mismatch at the core/shell interface. Approximately 3 g of QDs powders can be obtained through a single gram-scale one-pot preparation. The on-chip white light-emitting diode (LED), using the red and green Al-doped QDs as phosphors, exhibited a maximum power efficiency of 17.8 lm W–1 and stable CIE coordinates around (0.32, 0.35), and achieved a wide color gamut (97.4% of the NTSC color space), demonstrating the promising potential in lighting technologies.
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高影响因子
JOURNAL OF RARE EARTHS
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2024
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IF 5.2
Qi You,Mu Liu,Chengxiang Yang,Xuan Zhou,Wei Liu,Jinkai Li,Xuchuan Jiang
Both Al 3+ and Y 3+ ions co-doped Na 4 CaSi 3 O 9 :Bi 3+ ,Eu 3+ (NCSO:Bi 3+ ,Eu 3+ ) series phosphors were synthesized by a high temperature solid-phase method, and characterized by various advanced structural and spectral instruments. The impact of different doping ion concentrations on the luminescent behavior of the phosphors was also investigated. It is found that an ion substitution strategy is useful for enhancing the luminescence performance of the as-obtained NCSO:Bi 3+ ,Eu 3+ phosphors. The results show that doping a certain amount of Al 3+ ions into the NCSO:0.01Bi 3+ ,0.1Eu 3+ phosphor leads to a significant red-shift in the blue emission spectrum of Bi 3+ up from 350 to 405 nm and an increase in the half-peak width by 21 nm, better spectral match for plant response. Furthermore, doping Y 3+ ions into the matrix also enhances the sensitization effect of Bi 3+ ions, resulting in a significant increase in luminous intensity. X-ray powder diffraction (XRD) was used to verify the crystal structure and phase purity of the synthesized phosphors. The mechanism of Al 3+ and Y 3+ doping affecting the emission spectrum is further discussed through the structure refinement. Finally, by comparing with the absorption spectra of plant growth pigments, it is found that the developed phosphors show great potential in promoting light controlling for plant growth.
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COMPOSITES COMMUNICATIONS
·
2024
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IF 6.5
Rongcao Yu,Zhihai Lin,Minglong Luo,Bing Lei,Fengyuan Shu,Xin Yuan
In the challenging marine environment, organic coatings often fail to provide long-lasting protection. This study presents a novel approach for synthesizing multifunctional nano-pigments by utilizing hydrophobic and chemically bonded BNNSs@PDA/ODA nanosheets. The synthesis involves anchoring polydopamine (PDA) onto boron nitride nanosheets (BNNSs), followed by grafting octadecyl amine (ODA). This dual modification effectively prevents agglomeration of BNNSs and enhances their adhesion with silicone-epoxy resins at the interface. Comprehensive characterization confirms the successful grafting of ODA onto PDA-modified BN nanosheets, significantly improving the barrier properties of coatings. Remarkably, after immersing in a 3.5 wt% NaCl solution for 75 days, the composite coating BNNSs@PDA/ODA-SE exhibits an impedance modulus (|Z| 0.01Hz ) of 10 10 Ω cm 2 at low frequency, surpassing that of pure SE coating by nearly three orders of magnitude. The superior protective performance of the composite coating can be attributed to the synergistic effect between the physical barrier generated by BNNSs, insoluble complexes formed by Al 3+ -PDA, and the high hydrophobic surface network provided by ODA.
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INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
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2024
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IF 8.1
Zhongrui Li,Lei Guo,Wenchen Ren,Junjie Han,Santosh Kumar Verma,Shihang Xu,Lin Liu,Tong Zhang,Yunhua Xu
The design of efficient ammonia cracking catalysts is the key to developing ammonia as a hydrogen storage carrier. This paper investigated the role of Co–Al hydrotalcite carriers in ruthenium-based catalysts. Ru/Co–Al catalysts were prepared by mechanical milling, impregnation, and co-precipitation, and the catalytic activity and physicochemical properties of the catalysts were investigated, respectively. The catalysts prepared by the co-precipitation method exhibit the maximum specific surface area and metal dispersion due to the layered structure of LDH and the homogeneity of the co-precipitation method. In this study, it is concluded that the substitution of Ru during the co-precipitation preparation builds up strong metal-carrier interactions and generates a large number of oxygen vacancies. The catalyst prepared by the co-precipitation method exhibited a high H 2 generation rate (19.5 mmol·gcat −1 ·min −1 ) at GHSV = 30,000 ml·gcat −1 ·h −1 and 450 °C, and the performance remained stable after 50 h of reaction. This work provides a new idea for designing efficient Ru-based catalysts.
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Minerals
·
2024
·Vol. 14
·期 8
·771
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IF 2.2
Lili Feng,Kaixuan Bian,Kailong Zhang,Jiawei Geng,Yanmin Zheng,Xiao Li
The modes of occurrence, migration, and evolution pathways of lithium (Li) and gallium (Ga) during combustion of an Al-rich coal from Inner Mongolia, China, were investigated using methods of simulated combustion experiments, the sequential chemical extraction procedure (SCEP), and the thermodynamic equilibrium calculation. Mineralogical and chemical compositions of the feed coal and combustion ash were analyzed by X-ray fluorescence (XRF), X-ray diffraction (XRD), inductively coupled plasma mass spectrometry (ICP-MS), and scanning electron microscopy (SEM). The study reveals that Li and Ga are significantly enriched in the ash after combustion, with the contents reaching up to 1086 μg/g and 133 μg/g, respectively. The primary modes of occurrence of Li and Ga in the ash are quartz and aluminosilicates, and sulfides, respectively. Li, in the form of LiAlSi4O10(s), primarily occurs in hematite, glass, and quartz below 800 °C. However, it migrates into the glass phase, mullite, and quartz above 1000 °C. On the other hand, Ga exists as Ga4S5(s) and transforms into Ga2S (g) as the temperature rises from 800 °C to 1000 °C, maintaining this gaseous form until 1200 °C. Ga4S5(s) predominantly occurs in the glass phase at 600 °C, whereas mullite and quartz become its dominant modes of occurrence in industrial combustion ashes and ashes obtained from simulated combustion above 600 °C.
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CERAMICS INTERNATIONAL
·
2018
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IF 3.057
Yang Yu,Yu Zhao,Tian-Dong Zhang,Rui-Xuan Song,Yu-Lei Zhang,Yu-Long Qiao,Wei-Li Li,Wei-Dong Fei
Colossal dielectric properties in donor-acceptor co-doped rutile TiO 2 ceramics have attracted increased interest in recent years. However, dielectric loss (tan δ) of (Nb+Al) co-doped TiO 2 ceramics are quite scattered in the previous studies. Here, we show the dielectric properties of (Nb+Al) co-doped rutile TiO 2 ceramics are sensitive to sintering and ageing technologies, which is related to the coupling behavior of acceptor-donor ions. Both permittivity and dielectric loss of as-sintered (Nb+Al) co-doped TiO 2 ceramics are very large, and increase with the sintering time increasing. After ageing treatment at 900 °C, the dielectric loss of co-doped ceramics reduces from 139 to 0.15 in a wide frequency range. Based on the X-ray diffraction and complex impedance analyses, it can conclude that Nb 5+ -Al 3+ pair formation during ageing treatment reduces the concentration of oxygen vacancy , resulting in the decreases of the conductivity and dielectric loss. The changes in dielectric response of (Nb+Al) co-doped TiO 2 ceramics clearly suggest that ageing process is an effective way for the Nb 5+ and Al 3+ ions to form the Nb 5+ -Al 3+ pairs. We believe that the coupling effect of donor-acceptor ions is a practical and feasible route to reduce the dielectric loss of (Nb+Al) co-doped TiO 2 ceramics for high-energy-density storage applications.
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CHEMICAL ENGINEERING JOURNAL
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2017
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IF 6.216
Chunpei Yu,Wenchao Zhang,Yu Gao,Debin Ni,Jiahai Ye,Chenguang Zhu,Kefeng Ma
The energy performance of nanothermites in aqueous conditions is commonly restricted by the rapid heat dissipation and corrosion of nano-Al. Here we report studies on the fabrication and submerged ignition for the super-hydrophobic nanothermite film based upon the Co 3 O 4 /Al core/shell nanowires (NWs). The Co 3 O 4 NWs arrays, which are synthesized using a facile hydrothermal-annealing method, serve as templates for the deposition of Al shells by magnetron sputtering. The super-hydrophobic surface is subsequently realized by the fluoroalkylsilane coating. The tests of the laser-induced underwater ignition reveal that the super-hydrophobic modification effectively could lead to the ignition of the nanothermite film. Furthermore, the anti-aging behaviors of the obtained super-hydrophobic nanothermite film in aqueous conditions are investigated in detail to compare the heat-release and ignition characteristics at different submersion times. Impressively, the resultant super-hydrophobic composite could still hold about 50% of the original energy even after an underwater storage of 2 days.
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Advances in Applied Ceramics
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2018
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IF 1.092
Kuibao Zhang,Dan Yin,Xirui Lu,Haibin Zhang
In this study, the zirconolite-rich composite was rapidly synthesised from self-propagating high-temperature synthesis plus quick pressing using MoO3 as the oxidant and Ti as the reductant. As a surrogate of trivalent actinides, Nd was introduced to substitute the Ca site of zirconolite and Al was employed as the charge compensator to replace the Ti site (nominally Ca1−xNdxZrTi2−xAlxO7). The phase composition and Nd occupancy were analysed after Nd2O3 addition. Nd-bearing zirconolite was produced as the major ceramic phase. Nd mostly substitutes the Ca sites of zirconolite, which results in waste loading higher than 8.6 wt-% Nd. The aqueous durability of Nd–Al codoped sample (with 15 at.-% Nd substitutes the Ca site of zirconolite) was evaluated at 90°C as well. The 42 days normalised leaching rates of Mo, Ca and Nd were measured to be 3.70, 1.90 × 10−2 and 3.46 × 10−4 g m−2 d−1.
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LANGMUIR
·
2024
·
IF 3.7
Mian Gong,Yihui Dong,Minghai Zhu,Fengxiang Qin,Tianchi Wang,Faiz Ullah Shah,Rong An
Surface-enhanced Raman scattering (SERS) is a remarkably powerful analytical technique enabling trace-level detection of biological molecules. The interaction of a probe molecule with the SERS substrate shows important distinctions in the SERS spectra, providing inherent fingerprint information on the probe molecule. Herein, nonhalogenated phosphonium-based ionic liquids (ILs) containing cations with varying chain lengths were used as trace additives to amplify the interaction between the cytochrome c (Cyt c) and Zr–Al–Co–O (ZACO) nanotube arrays, strengthening the SERS signals. An increased enhancement factor (EF) by 2.5–41.2 times compared with the system without ILs was achieved. The improvement of the SERS sensitivity with the introduction of these ILs is strongly dependent on the cation chain length, in which the increasing magnitude of EF is more pronounced in the system with a longer alkyl chain length on the cation. Comparing the interaction forces measured by Cyt c-grafted atomic force microscopy (AFM) probes on ZACO substrates with those predicted by the extended Derjaguin–Landau–Verwey–Overbeek (XDLVO) theory, the van der Waals forces became increasingly dominant as the chain length of the cations increased, associated with stronger Cyt c–ZACO XDLVO interaction forces. The major contributing component, van der Waals force, stems from the longer cation chains of the IL, which act as a bridge to connect Cyt c and the ZACO substrate, promoting the anchoring of the Cyt c molecules onto the substrate, thereby benefiting SERS enhancement.
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FUEL
·
2024
·
IF 6.7
Ranlei Shao,Lu Zhang,Luyuan Wang,Jianmei Wang,Xingyu Zhang,Shiwang Han,Xingxing Cheng,Zhiqiang Wang
In this study, Ru catalysts supported on Ce-Al composite carriers were prepared using the precipitation-hydrothermal method, significantly enhancing ammonia decomposition efficiency. The test results show that the Ru/3Ce-Al catalyst, with a Ru loading of only 0.8 wt%, achieves a reaction rate of 14.17 mmol g cat −1 min −1 at 500 °C, and reaches a 95 % conversion rate at 525 °C. No decline in efficiency was observed after 48 h of durability testing, which significantly reduces the usage of Ru. The RuO 2 particle size in the samples was only 2–4 nm. Ce-Al composite increased the specific surface area and pore volume of the catalyst, facilitating the uniform distribution of Ru. Additionally, it increased the number of surface acidic sites and strengthened the metal-support interaction. The unique low redox potential and oxygen vacancies of CeO 2 allowed for faster electron transfer to the Ru surface. DFT calculations revealed that bridge site adsorption was more stable, with the rate-determining step of the ammonia decomposition reaction being the formation of N 2 . Ce-Al composite catalysts enhanced NH 3 adsorption strength and lowered the reaction energy barrier.
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APPLIED CATALYSIS B-ENVIRONMENTAL
·
2024
·
IF 20.2
Yang Liu,Shuyu Niu,Yu Zou,Shenglong Huang,Yunxuan Shi,Shuyan Gao,Panagiotis Tsiakaras
It is a great challenge to design and synthesize catalysts that can regulate both adsorption and desorption processes for electrocatalytic nitrate reduction to ammonia (NRA). Herein, amorphous Cu-Ni-Al nanometallic glasses (NG) were synthesized using a facile thermal evaporation coupled Joule heating method. The Cu 50 Ni 25 Al 25 -NG exhibits remarkable Faradaic efficiency (98.81 %) and NH 3 yield-rate (211.14 μmol h −1 cm −2 ) at an outstanding positive potential of −0.15 V vs. RHE. Aluminum atoms of low work-function when intercalated at different positions in Cu 50 Ni 25 Al 25 -NG enhance both adsorption and desorption processes during NRA. The oscillatory properties of surface potential detected by Kelvin-probe force microscopy demonstrate the diversity of active sites on Cu 50 Ni 25 Al 25 -NG. Two potential-regulated reaction mechanisms in NRA on the surface of Cu 50 Ni 25 Al 25 -NG were proposed using in-situ electrochemical Raman spectra. This work provides a new method for the preparation of multi-element NG enriched with low work-function metals and a new idea for the synthesis of synergistic catalytic-sites for NRAs.
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COMBUSTION AND FLAME
·
2024
·
IF 5.8
Jiabao Zhu,Shuo Wang,Weiqiang Xiong,Jun Wang,Xiaodong Li,Meishuai Zou
Aluminum-lithium alloy powder exhibits better thermal properties and combustion performances than aluminum , thus showing promising applications in the field of energetic materials such as explosives and propellants. However, the high activity of lithium also raises issues of stability and compatibility with propellant components, deteriorating the powder's overall performance. In this study, a facile coating method is presented using 1H,1H,2H,2H-perfluorooctyltriethoxysilane (PFOTS) as a surfactant to coat hydroxyl‑terminated polybutadiene (HTPB) on the surface of Al-5Li powder, forming the core-shell composite Al-5Li@HTPB. The microstructure and chemical composition characterized by SEM, EDS , XPS , FT-IR, and nano-CT demonstrated that a uniform and dense layer was successfully coated on the surface. The thermal analysis results showed a significant improvement in the thermal properties and stability compared to pure Al-5Li. In addition, ignition tests were conducted, and the results showed that Al-5Li@HTPB could reduce the ignition delay time and significantly reduce agglomeration. Overall, our strategy provides a novel method to solve the stability issues of Al-Li powders and simultaneously enhance combustion performance.
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